1 * this specification are subject to be changed without notice. 9.20.1997 EM73362 4-bit micro-controller for lcd product preliminary preliminary preliminary preliminary preliminary general description EM73362 is an advanced single chip cmos 4-bit micro-controller. it contains 3k-byte rom, 52-nibble ram, 4-bit alu, 13-level subroutine nesting, 22-stage time base, one 12-bit timer for the kernal function and one high speed counter. EM73362 also contains 5 interrupt sources, 1 input port, 1~4 bidirection ports, built-in watch- dog-timer and lcd display (27x3 to 15x3). except low-power consumption and high speed, EM73362 have the stop mode and idle mode operation for power saving function. features ? operation voltage : 1.1v or 1.8v.(clock frequency : 32 k hz) ? clock source : single clock system for crystal, connect a external resistor or external clock source, available by mask option. ? instruction set : 109 powerful instructions. ? instruction cycle time : up to 122 m s for 32 k hz . ? rom capacity : 3072 x 8 bits. ? ram capacity : 52 x 4 bits. ? input port : 1 port (4-bit). ? bidirection port : 4 ports (p4, p6, p7, p8) are available by mask option. p4 is a high current port. (p4.0 and tone available by mask option. p4.1~p4.3 are shared with the input/ output of rf counter.) p6, p7 and p8 are shared with seg15-seg26. ? 12-bit timer : one 12-bit timer is programmable for timer. ? high speed counter : the high speed counter includes one 8-bit high speed counter, one 12-bit general counter and a resistor frequency oscillator. it has frequency measurement mode, melody mode and auto load timer mode. ? built-in time base counter: 22 stages. ? subrountine nesting : up to 13 levels. ? interrupt : external interrupt . . . . . . 2 input interrupt sources. internal interrupt . . . . . . 2 timer overflow interrupts , 1 time base interrupt. ? lcd driver : 27x3 to 15x3 dots available by mask option. 1/3, 1/2 and static three kinds of duty (1/2 bias) selectable. the programming method of lcd driver is i/o mapping. ? built-in watch-dog-timer is available by mask option. ? built-in low battery detector. ? power saving function : stop mode and idle mode. ? package type : chip form 49 pins.
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