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PIC18 74LV1G00 D1409 TE28F 4LVX1 D1154 TS4855 PKG00
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XIN XOUT /HKS HFI

Clock Generator
SRAM Memory C1/IPP~C5 R1~R4 Keyboard Interface and R-option Control Logic
Output Circuit
Pulse Generator PO
Volume control


HDO HFO /XMUTE
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DTMFO/MLDA
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LINE R45
VDDA
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GTO
VSSA VREF
C19 SLPE REG
REG
C20

C25 FIG 16 FIG 17
LINE MIC+ GTO MIC
VREF ANOUT GTF SLPE REG
ANOUT GTF SLPE MIC+ GTO MICVREF REG
LINE

-symmetricFIG 18
-asymmetric-





LINE GRO RXI GRF DTMFO ANTI-SIDETONE FIG 19 FIG 20 FIG 21
DTMFI /XMUTE
AGC











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