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SC204A ver2 .1 content 1. general de scription --------------------------------------------------------------------------3 2. maximum abso lute limit---------------------------------------------------------------------3 3. mechanical ch aracteristics------------------------------------------------------------------3 a) physical data b) external dimensions 4. electrical char acteristics---------------------------------------------------------------------4 a) dc characteristics b) ac characteristics c) el backlight d) led back light 5. operating principles--------------------------------------------------------------------------7 a) pin description b) block diagram c) instruction description 6. operating methods---------------------------------------------------------------------------13 a) interface w i th mpu b) pow er supply c) operating example akihabara inc. www.akiba-tech.com page 2 of 2
SC204A ver2 .1 1. general description SC204A, a d o t-matrix character lcd module, design for displa ying 4 line 20 row characters. character font is 5x7 dots with cursor . the SC204A provides two types of interfaces to mpu: 4-bit and 8-bit interfaces. SC204A can includes el or led backlight for cu sto m des ign. th e custom ca n design for color of el or led backlight, viewing angle and lcd type. 2. maximum absolute limit c h a r a c t e r i s t i c s s y m b o l r a t i n g s r e m a r k operating v o ltage v dd -0.3v to +7.0v driver supply v o ltage v lcd vdd - 12v to vdd + 0.3v input v o ltage range v in -0.3v to vdd + 0.3v t a 1 0c to+50c normal temperature lcm operating t e mperature t a2 -20c to+60c wide temperature lcm storage t e mperature t st o - 2 5 c t o + 7 0 c note: stresses beyond th ose given in the absolute ma ximum r a ting table may caus e operational er r o rs or damage to the device. 3. mechanical characteristics a) physical data i t e m s t a n d a r d v a l u e u n i t r e m a r k number of characters 204 module size 98.060.014.0 mm v i ewing area 76.026.0 mm active area 70.420.80 mm character size 4.752.95 mm character pith 5.353.55 mm approx. weight g drive m e t h o d 1/5bias 1/16 duty b) external dimensions p2. 54x15= 38.10 0. 5 5 0. 6 0 0. 5 5 0. 6 0 2. 9 5 3. 5 5 4. 7 5 5. 3 5 55.00 ? 0.3 60.00 ? 0.5 38.40 ? 0.3 20.80 26.00 ? 0.3 (v.a.) 10.80 2.50 1.60 70.40 76.00 ? 0.3 (v.a.) 97.00 ? 0 .3 ma x 14. 00 93.00 ? 0 .3 98.00 ? 0.5 10.00 16-r0.5 11 6 unit:m m 4-r1.5 akihabara inc. www.akiba-tech.com page 3 of 3
SC204A ver2 .1 4. electrical characteristics a) dc characteristics ( ta = 25c, vdd = 4.5 to 5.5v) limit characteristics symbol min. t yp . max. unit test condition input high voltage v im 2.2 vdd v input low voltage v ll -0.3 0.6 v input high current i ih -2.0 2.0 ua input low current i ll -20 -50 -100 ua vdd = 5.0v out p ut hi g h volta g e v oh 2.4 - vdd v i oh = - 0.1ma pins: db7-0 out p ut low volta g e v ol - - 0.4 v i ol = 0.1ma pins: db7-0 lcd volta g e v lcd 5 v operating current i dd 1.0 ma note: vdd = 5v b) ac characteristics b.1) ac characteristics ( ta = 25c, vdd = 4.5 to 4.5v) write mode (writing data from mpu to lcd module) limit characteristics symbol min. typ. max. unit test condition e cycle time tc 1000 ns pine e pulse width tpw 450 - - ns pine e rise/fall time tr,tf - - 25 ns pine address setup time tsp-i 60 ns pins: rs, r/w, e address hold time thd1 20 ns pins: rs, r/w, e data setup time tsp2 195 ns pins: db7-0 data hold time thd2 10 - - ns pins: db7-0 read mode (reading data from lcd module to mpu) limit characteristics symbol min. t yp . max. unit test condition e c y cle time tc 1000 ns pine e pulse width tw 450 ns pine e rise/fall time tr , tf 25 ns pine address setu p time ts p -i 60 ns pins: rs , r/w , e address hold time thd1 20 ns pins: rs , r/w , e data out p ut dela y time td 360 ns pins: db7-0 data hold time thd2 5.0 - - ns pin db7- 0 akihabara inc. www.akiba-tech.com page 4 of 4
SC204A ver2 .1 b.2) ac characteristics (ta = 25c, vdd = 4.5 to 5.5v) w r ite mode (w riting data from mpu to lcd module) limit c h a r a c t e r i s t i c s s y m b o l m i n . t y p . m a x . unit t e st condition e cycle t i me tc 400 n s p i n e e pulse width tpw 1 5 0 - - n s p i n e e rise/fall t i me tr,tf - - 2 5 n s p i n e address setup t i me tsp-i 30 ns pins: rs, r/w , e address hold t i me t h d 1 1 0 ns pins: rs, r/w , e data setup t i me t s p 2 4 0 n s p i n s : d b 7 - 0 data hold t i me thd2 1 0 - - n s pins: d b 7 - 0 read mode (reading data from lcd module to mpu) limit c h a r a c t e r i s t i c s s y m b o l min. ty p . m a x . unit t e st condition e cycle t i me tc 400 n s p i n e e pulse width tw 150 n s p i n e e rise/fall t i me tr,tf 2 5 n s p i n e address setup t i me t s p - i 3 0 ns pins: rs, r/w , e address hold t i me thd1 10 ns pins: rs, r/w , e data output delay t i me td 1 0 0 n s pins: d b 7 - 0 data hold time thd2 2 0 - - n s p i n d b 7 - 0 c) el backlight el ,cold cathode fluorescent lamp and led etc, are available as backlight for lcd module upon your choice ,your request. 1.el ? 1 ? featur es max 1.3m m thickness (max 1.5m m for lead portion). w i de driving condition of 60-1000hz and 150v ac max .with inverter , step-up voltage from 1.5v battery is available. em itted colors are blue-green and white . operating characteristics ? 2 ? electrical characteristics life characteristics v o ltage vs. brightness v o ltage vs. current d e nsity d) led backlight (1) featur es low voltage driving (dc) is available without inverter . 0 50 10 0 15 0 20 0 50 10 0 1 5 0 50 h z 40 0h z 1 khz vo lta g e ( vrms ) br i ght n e ss c u rr en t den s it y (ma/ c m ) 04 v o lt ag e (v r m s) 10 0 50 0 02 15 0 50 h z 06 08 40 0h z 1 khz 10 2 po w e r co nsu m pti o n ( m w / c m ) 2 in it ia l b r i g h t n e s s r a t i o n (%) ti me (h) 0 10 0 10 0 20 0 3 0 0 40 0 5 0 0 50 10 0v /4 0 0 h z 10 0v /7 0 0 h z 10 0v /5 0 h z a m bi en t co nd it io n: 50 ?? c 90 % rh co ns t a nt vo lt a g e /fr e qu ency dri v e in ve rte r d r i v e c u r r e n t de ns ity po w e r c o ns um p tio n akihabara inc. www.akiba-tech.com page 5 of 5
SC204A ver2 .1 long life tim e 100000 hours (average). no noise occurrence. v a rious color of yellow-green and am ber etc. operating characteristics (2) electrical characteristics (refer ence data) forward current derating curve w a ve length vs. relative light intensity 100% forward current (if) 20% - 2 0 2 5 7 0 ?? note : the above spec . are only for reference w a ve le ngt h ( m m ) l a l: y e llo w - g r e e n a: amber 700 680 660 640 620 600 580 560 540 520 100 relativ e l g i in ten s ity ( h t (% ) 50 0 timing characterisics db 0 ~ db 7 r/ w rs tr th 1 ts u 2 tc va l i d da t a th 2 tw tf th 1 e ts u 1 w r i t e t i m i n g ts u e db 0 ~ db 7 r/ w rs tr th tc va l i d da t a td td h tw tf th read t i ming akihabara inc. www.akiba-tech.co m page 6 of 6
SC204A ver2 .1 5. operating principles a) pin description pin no. symbol level function 1 v s s 0 v ground 2 v d d 4.5v~5.5v supply voltage for logic 3 v 0 v a riable voltage for lcd 4 r s h / l h: instruction code l: data 5 r / w h / l h: read signal l: w r ite signal 6 e h ? l enable signal 7 d b 0 h/l 8 d b 1 h/l 9 d b 2 h/l 1 0 d b 3 h/l 11 d b 4 h/l 1 2 d b 5 h/l 1 3 d b 6 h/l 1 4 d b 7 h/l data bits in case of 4 bits instruction, data is transferred b y twice using only 4 buses of d4 ? d7 ,and d0 ? d3 ar e not used , fir s t oper ation is higher ord e r 4 bits and second is lower 4 bits of 8 bits , but in ca se of 8 bits instruction , data is transferred b y data by data bus of d0 ? d7 15 b l a ( + ) 4 . 2 v supply vo ltage for led-backlight 16 b l k ( - ) 0 v supply volt age for led-backlight b) block d i agram ir i/o b u f f e r lcd d r iv in g c i rc u i t p t o s r e g i s t o r bus y fla g dr cg ram cg ram cu r s o r a n d bl i n k ck t . co m d r iv in g ci r c u i t dd ram ac t i mi n g co n t r o l ci r c u i t d e c o d e r rs r/ w e d0 - d 3 d4 - d 7 vdd vo vs s a. data register (dr): dris a register used for te mporary storage of the dat a read/write form/into dd ram and cg ram. b. instruction register (ir): is a register ava ilable for storing the in struction codes and address information of display data (dd) ra m and character generator (cg) ram. c. busy flag (bf): when the busy flag is ?1?,it show s that lcm is in internal operation and it can not accept the next instruction. d. character generator (cg) rom: this rom generat es character pattern fr om 8-bit character code and provides 192 character patterns. e. character generator (cg)ram: this ram allows t he user to rewrite the character patterns freely according to the program. f. address counter (ac): this address counter is used to give the address information of dd ram and cg ram. akihabara inc. www.akiba-tech.com page 7 of 7
SC204A ver2 .1 g. dis p lay data (dd) ram: this dis p lay data ram is used to store the display d a ta exp r essed by 8-bi t character code . the capacity is 80x 8bits and data fo r 80 characters can be storage. h. cursor and blink control circuit: this circuit generates the cursor and blink. ra m' s address and the lcd ' s position show n bellow s . display character address code: display position 1 2 3 4 5 6 7 8 9 1 0 1 1 1 2 1 3 1 4 1 5 1 6 0 0 0 1 0 2 0 3 0 4 0 5 0 6 0 7 0 8 0 9 0 a 0 b 0 c 0 d 0 e 0 f ddram addres s 4 0 4 1 4 2 4 3 4 4 4 5 4 6 4 7 4 8 4 9 4 a 4 b 4 c 4 d 4 e 4 f relationship between character code ( ddram) and character pattern (cgram) character code dd ra m data cg ra m a d d r ess character pattern cg ra m data b 7 b 6 b 5 b 4 b 3 b 2 b 1 b 0 b 5 b 4 b 3 b 2 b 1 b 0 b 7 b 6 b 5 b 4 b 3 b 2 b 1 b 0 0 0 0 1 1 1 1 1 0 0 1 0 0 1 0 0 0 1 0 0 0 1 0 0 0 1 1 0 0 1 0 0 1 0 0 0 0 1 0 0 1 0 1 0 0 1 0 0 1 1 0 0 0 1 0 0 0 0 0 0 x 0 0 0 0 0 0 1 1 1 x x x 0 0 0 0 0 0 0 0 0 1 1 1 0 0 0 1 0 0 1 0 0 0 1 0 0 0 1 0 0 0 1 1 0 0 1 0 0 1 0 0 0 0 1 0 0 1 0 1 0 0 1 0 0 1 1 0 0 1 1 1 0 0 0 0 0 x 0 0 1 0 0 1 1 1 1 x x x 0 0 0 0 0 1. } it means that the bit0~2 of the character c ode correspond to the bit3~5 of the cg ram address. 2. } these areas are not used for display , but can be used for t he general data ram. 3. when all of the bit4-7 of t he character code is 0, cg ram character patterns are selected. 4. " 1 ": selected," 0 ": no sele cted," x": do not care (0 or 1). 5. for example (1), to set character code (b2 = b1 = b0 = 0, b3 = 0 or 1, b7-b4 = 0) is to display" t". that means character code (00)16, and (08) 16 can display" t? character . 6. the bits 0-2 of the character cod e ram is ch arac ter pattern line position. t he 8th line is the cursor position and display is formed by logical or with the cursor akihabara inc. www.akiba-tech.com page 8 of 8
SC204A ver2 .1 cgrom character code t able: l lll l lll cg ram (1 ) up p e r 4b i t lo w e r 4b i t l l l h l l hl l l hh l h l l l h l h l hhl l hhh hl l l hl l h hl hl hl hh hh l l hh l h hh hl hh hh l llh (2 ) ll h l (3 ) ll h h (4 ) lh l l (5 ) lh l h (6 ) l hhl (7 ) l hhh (8 ) hl l l (1 ) hl l h (2 ) hl hl (3 ) hl hh (4 ) hh l l (5 ) hh l h (6 ) hh hl (7 ) hh hh (8 ) akihabara inc. www.akiba-tech.com page 9 of 9
SC204A ver2 .1 c) instruction description control and display instructions w ill show in details as following: c.1) clear display r s r / w d 7 d 6 d 5 d 4 d 3 d 2 d 1 d 0 0 0 0 0 0 0 0 0 0 1 it clears the w hole display and sets display data ra m' s address 0 in address counter . c.2) return home r s r / w d 7 d 6 d 5 d 4 d 3 d 2 d 1 d 0 0 0 0 0 0 0 0 0 1 x x : d o not care (0 or 1) it sets d i spl a y dat a ra m' s address 0 i n a ddress c o u n te r and dis p lay returns to its origi n a l p o sit i on. t h e curso r or b l in k go e s to t h e le ft e d g e o f th e di sp la y (t o th e 1 s t l i ne if 2 l i n e s are disp lay e d). the co nt en ts of t h e disp lay data ra m do not change. c.3) entry mode set d u ring w r iting and reading data, it sets cursor m ove direction and shifts the display . r s r / w d 7 d 6 d 5 d 4 d 3 d 2 d 1 d 0 0 0 0 0 0 0 0 1 i/d s i/ d = 1: in crement, i / d = 0: decrement. s = 1: the display shift, s = 0: the display does not shift s= 1 i/d= 1 it shifts the display to the left s= 1 i/d=0 it shifts the display to the right c.4) display on/off control r s r / w d 7 d 6 d 5 d 4 d 3 d 2 d 1 d 0 0 0 0 0 0 0 1 d c b d = 1: d i spla y on, d = 0: d i splay of f c = 1: cursor on , c = 0: cursor of f b = 1: blinks on, b= 0: blinks of f c.5) cursor or display shift w ithout changing d d ra m' s daters, it can m ove cursor and shift display r s r / w d 7 d 6 d 5 d 4 d 3 d 2 d 1 d 0 0 0 0 0 0 1 s / c r / l x x s / c r / l d e s c r i p t i o n a ddress c o u n t e r 0 0 shift cursor to the left ac = ac - 1 0 1 shift cursor to the right a c = a c + 1 1 0 shift display to the left. cursor follows the display shift ac=ac 1 1 shift display to the right. cursor follows the display shift ac=ac c.6) function set r s r / w d 7 d 6 d 5 d 4 d 3 d 2 d 1 d 0 0 0 0 0 1 d l n f x x x : d o not care (0 or 1) dl: it sets interface data length. d l = 1: d a tas are transferred w ith 8-bit lengths (d b7 - 0).d l = 0: d a tas are transferred w ith 4-bit lengths (d b7 - 4). (it needs two t i m e s to transf er dat a s) n: it sets the nu m b er of the dis p l a y line . n = 0: one-lin e dis p lay . n = 1: t w o-lin e display . f: it sets the character font. f = 0: 5 x 7 dots character font. f = 1: 5 x 10 dots character font. n f no. of display lines character font duty factor 0 0 1 5x 7 dots 1 /8 0 1 1 5x 10 dots 1 /1 1 1 x 2 5x7 dots 1 /16 akihabara inc. www.akiba-tech.com page 10 of 10
SC204A ver2 .1 c.7) set character generator ram address r s r / w d 7 d 6 d 5 d 4 d 3 d 2 d 1 d 0 0 0 0 1 a a a a a a it sets c h ara c t e r ge nerat o r ram addres s (aaaa aa)2 to the address c o unter . c h ara c ter generat o r ram da ta c a n rea d or write after this setting. c.8) set display data ram address r s r / w d 7 d 6 d 5 d 4 d 3 d 2 d 1 d 0 0 0 1 a a a a a a a it sets display data ram address (aaaaaaa)2 to the address counter . display data ram can read or write after this setting. in one-line display (n = 0), (aaaaaaa)2; (oo)16 - (4f)16 in two-line display (n = 1), (aaaaaaa)2: (00)16 - (27)16,gfor the first line, (aaaaaaa)2: (40)16 - (67)16, gfor the second line. c.9) read busy flag and address r s r / w d 7 d 6 d 5 d 4 d 3 d 2 d 1 d 0 0 1 b f a a a a a a a when (bf = 1) in di cat es t h at t h e sy stem is busy now , i t w ill n o t a c c e pt any i n stru cti on un til n o busy (bf = 0). a t t h e sam e tim e, the address counter content? s (aaaaaaa)2; is read out. c.10) w r ite data to character generator ram or display data ram r s r / w d 7 d 6 d 5 d 4 d 3 d 2 d 1 d 0 1 0 d d d d d d d d it w r ites data (dddddddd)2 to character generator ra m or display data ra m. c.1 1 ) read data from character generator ram or display data ram r s r / w d 7 d 6 d 5 d 4 d 3 d 2 d 1 d 0 1 1 d d d d d d d d it read s dat a (d dd dd dd d ) 2 fro m ch aract e r gen e rat o r ra m or d i spl a y dat a ra m . t o ge t the c o rrec t d a ta rea d o u t is sh ow n below : ( ? ) set the address of the character generator ram or di splay data ram or shift the cursor instruction. (ii) send t he ? r ead ? i nstruction. akihabara inc. www.akiba-tech.com page 11 of 11
SC204A ver2 .1 instruction table instruction code instruction rs rw d7 d6 d5 d4 d3 d2 d1 d0 d e scription execution time (fosc=270khz) clear dis p lay 0 0 0 0 0 0 0 0 0 1 w r ite "20h" to ddram and set ddram address to "ooh" from ac 1.52ms return home 0 0 0 0 0 0 0 0 1 - set ddram address to "ooh" from ac and return cursor to its original position if shifted. the c ontents of ddram are not changed. 1.52ms entry mode set 0 0 0 0 0 0 0 1 i/d s assign cursor moving direction and enable the shift of entire dis p la y 38us dis p lay on/ off 0 0 0 0 0 0 1 d c b set display(d), cursor(c), and blinking of cursor(b) on/of f control bit. 38us cursor or dis p lay shift 0 0 0 0 0 1 s/c r/l - - set cursor moving and display shift control bit, and the direction, without changing of ddram data. 38us function set 0 0 0 0 1 dl n f - - set interface data length (dl: 8-bit/4-bit), numbers of display line (n: 2-line/1- line) and, display font type (f:5x10dots/5x8dots) 38us set cgram address 0 0 0 1 ac5 ac4 ac3 ac2 ac1 aco set cgram address in address counter . 38us set ddram address 0 0 1 ac6 ac5 ac4 ac3 ac2 ac1 aco set ddram address in counter 38us read busy flag and address counter 0 1 bf ac6 ac5 ac4 ac3 ac2 ac1 aco whether during internal operation or not can be known by reading bf . the contents of address counter can also be read. 38us wr i t e d a t a to ram 1 0 d7 d6 d5 d4 d3 d2 d1 do w r ite data into internal ram (ddram/cgram). 38us read data from ram 1 1 d7 d6 d5 d4 d3 d2 d1 do read data from internal ram (ddram/cgram). 38us akihabara inc. www.akiba-tech.com page 12 of 12
SC204A ver2 .1 6. operating methods a) interface with mpu i n te r f a c e to z 8 0 c p u /r d d0 - d 7 /i r q 8 /w r a1 - a 7 a0 z8 0 7 mu x r d lc m d0 - d 7 rw cq e rs a0 e /r d d0 - d 7 d0 - d 7 rw lc m rs m c 680 0 8 i n t e r f a c e t o m c 680 0 c p u e i n t e r f ace t o m c s 5 1 c p u /r d d0 - d 7 8 /w r a1 5 lc m d0 - d 7 rw e rs a1 4 mc s 5 1 akihabara inc. www.akiba-tech.com page 13 of 13
SC204A ver2 .1 b) power supply gn d -5 v v dd -v o : l c d dr i v i n g vol t age lc m v ss v dd -v o v o v dd 10k~ 20k v dd s i ngl e s u ppl y v o l t a ge t y pe s 10 k~ 20 k v d d - v o :l c d d r iv in g v o lt a g e lc m vs s vd d- v0 vo vd d +3v ve e vd d d u al s u p p l y v o l t ag e t y p e s c) operating example 8-bit operation and 8-digit 1-line display (using internal reset) n o i n s t r u c t i o n d i s p l a y o p e r a t i o n 1 power on . ( splc780a1 starts initializing ) power on reset. no display . function set rs r/w d7 d6 d5 d4 d3 d2 d1 d0 2 0 0 0 0 1 1 0 0 x x set to 8-bit oper ation an d select 1-line displa y line and character font. display on / of f control 3 0 0 0 0 0 0 1 1 1 0 _ display on. cursor appears. entry mode set 4 0 0 0 0 0 0 0 1 1 0 _ increase ad dress by o n e . it will shift the cursor to the righ t when writing to the dd ram / cg ram. now the display has no shift. w r ite data to cg ram / dd ram 5 1 0 0 1 0 1 0 1 1 1 w_ w r ite ?w". the cursor is incremented by one and shifted to the right. w r ite data to cg ram / dd ram 6 1 0 0 1 0 0 0 1 0 1 we_ w r ite ?e ". the cursor is incremented by one and shifted to the right. 7 ??? ???? w r ite data to cg ram / dd ram 8 1 0 0 1 0 0 0 1 0 1 welcome_ w r ite ?e ". the cursor is incremented by one and shifted to the right. entry mode set 9 0 0 0 0 0 0 0 1 1 1 welcome_ set mode fo r display shift when writing w r ite data to cg ram / dd ram 10 1 0 0 0 1 0 0 0 0 0 elcome_ w r ite" "(spa c e). the cursor is incremented by one and shifted to t h e ri g h t . akihabara inc. www.akiba-tech.com page 14 of 14
SC204A ver2 .1 w r ite data to cg ram / dd ram 11 1 0 0 1 0 0 0 0 1 1 lcome c w r ite ?c ". the cursor incremented by on e an d shifted t the right. 1 2 ? ? ? ? ? ? ? w r ite data to cg ram / dd ram 13 1 0 0 1 0 1 1 0 0 1 comp amy w r ite " y " . the cursor is incremented by one and shifted to the right. cursor or display shift 14 0 0 0 0 0 1 0 0 x x comp amy only shift the cursor's position to the left (y). cursor or display shift 15 0 0 0 0 0 1 0 0 x x comp amy only shift the cursor's position to the left (m). w r ite data to cg ram / dd ram 16 1 0 0 1 0 0 1 1 1 0 omp a ny w r ite ?n ". the display moves to the left. cursor or display shift 17 0 0 0 0 0 1 1 1 x x comp any shift the display and the cursor's position to the right. cursor or display shift 18 0 0 0 0 0 1 0 1 x x comp any shift the display and the cursor's position to the right. w r ite data to cg ram / dd ram 19 1 0 0 1 0 0 0 0 0 0 omp a ny w r ite " " (space). the cursor is incremented by one and shifted to the r ight 2 0 ? ? ? ? ? ? ? return home 21 0 0 0 0 0 0 0 0 1 0 w e l c o m e both the display and the cursor return to the original position (address 0 ). 4-bit operation and 8-digit 1-line display (using internal reset) no i n s t r u c t i o n d i s p l a y o p e r a t i o n 1 power on . ( splc780a1 starts initializ ing ) power on reset. no display . function set r s r / w d 7 d 6 d 5 d 4 2 0 0 0 0 1 0 set to 4-bit operation function set 0 0 0 0 1 0 3 0 0 0 x x set to 4-bit operation and select 1-line display line and character font. display on / of f control 0 0 0 0 0 0 4 0 1 1 1 0 0 _ display on. cursor appears. entry mode set 0 0 0 0 0 0 5 0 0 1 1 0 0 _ increase address by one. it will shift the cursor to the right wh e n writing to the dd ram / cg ram. now the display has no shift. w r ite data to cg ram / dd ram 1 0 0 1 0 1 6 1 0 0 1 1 1 w _ w r ite ?w ?. the cursor is incremented by one and shifted to the right. 0 akihabara inc. www.akiba-tech.com page 15 of 15
SC204A ver2 .1 reset function at power on, it starts the internal auto-reset circuit and executes the initial instructions . there are the initial proce dures shown as bellows: 8bits interface power on bf cannot be checked bef ore this instruction function set (interface is 8 bits length). bf cannot be checked bef ore this instruction function set (interface is 8 bits length). rs r/w d7 d6 d5 d4 d 3 d2 d1 d0 0 0 0 0 1 1 x x x x bf cannot be checked bef ore this instruction function set (interface is 8 bits length). rs r/w d7 d6 d5 d4 d 3 d2 d1 d0 0 0 0 0 1 1 n f x x 0 0 0 0 0 0 1 0 0 0 0 0 0 0 0 0 0 0 0 1 0 0 0 0 0 0 0 1 i/d s bf cannot be checked after the following instructions function set (interface is 8 b i t s l e n g t h . s p e c i f y the number of display lines and character f o n t . ) t h e n u m b e r o f d i s p l a y l i n e s a n d character cannot be changed afterwards. dis p lay of f d i splay clear entry mode set initialization end w a it time > 100us rs r/w d7 d6 d5 d4 d 3 d2 d1 d0 0 0 0 0 1 1 x x x x w a it time > 4.1ms rs r/w d7 d6 d5 d4 d 3 d2 d1 d0 0 0 0 0 1 1 x x x x w a ite time > 15ms after vdd>4.5v akihabara inc. www.akiba-tech.com page 16 of 16
SC204A ver2 .1 power on 4bits interface rs r/w d7 d6 d5 d4 0 0 0 0 1 1 bf cannot be checked bef ore this instruction function set (interface is 8 bits length). bf cannot be checked bef ore this instruction function set (interface is 8 bits length). rs r/w d7 d6 d5 d4 0 0 0 0 1 0 0 0 0 0 1 0 0 0 n f x x 0 0 0 0 0 0 0 0 1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 0 0 0 0 0 0 0 0 0 1 i / d s rs r/w d7 d6 d5 d4 0 0 0 0 1 1 bf cannot be checked after the following instructions function set (set interfac e to be 4 bits length) interface 8 bits length function set (interface is 8 bits length. specify the number of display lines and character font.) the number of display lin es and character cannot be changed afterwards. dis p lay of f d i splay clear entr y mode set bf cannot be checked bef ore this instruction function set (interface is 8 bits length). initialization end w a it time > 100us rs r/w d7 d6 d5 d4 0 0 0 0 1 1 w a it time > 4.1ms w a ite time > 15ms after vdd>4.5v akihabara inc. www.akiba-tech.com page 17 of 17

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