Casio CE-300 Service Manual

Also see for CE-300 (EX-247): Service manual Most important functions

Casio CE-300 Service Manual Manual pdf 7 page image

— 5 —Pin No. Signal Description In/Out Status ofPower OnStatus ofPower OFF1 FB3 Not used — — —2 FB4 RAM bank 3 Out High High3 FB5 RAM bank 4 Out High High4 AVSS GND — GND GND5 PGM Not used — — —6 RAM Chip select signal for RAM Out High Low7 AVREF VDD — 5 V 5 V8 RXD Receive data In High High9 TXD Send data Out High High10 WD Winder motor drive signal Out Low Low11 DI Data signal from uPD16312 In Pulse High12 DO Data signal to uPD16312 Out Pulse High13 CLK Clock signal for uPD16312 Out Pulse High14 STB Data strobe signal for uPD16312 Out Pulse High15 KC0 Key common signal (KC0) Out Pulse High16 KC1 Key common signal (KC1) Out Pulse High17 KC2 Key common signal (KC2) Out Pulse High18 KC3 Key common signal (KC3) Out Pulse High19 AD0 Address / Data signal (AD0) In/Out Pulse High20 AD1 Address / Data signal (AD1) In/Out Pulse High21 AD2 Address / Data signal (AD2) In/Out Pulse High22 AD3 Address / Data signal (AD3) In/Out Pulse High23 AD4 Address / Data signal (AD4) In/Out Pulse High24 AD5 Address / Data signal (AD5) In/Out Pulse High25 AD6 Address / Data signal (AD6) In/Out Pulse High26 AD7 Address / Data signal (AD7) In/Out Pulse High27 A8 Address signal (A8) Out Pulse High28 A9 Address signal (A9) Out Pulse High29 A10 Address signal (A10) Out Pulse High30 A11 Address signal (A11) Out Pulse High31 A12 Address signal (A12) Out Pulse High32 A13 Address signal (A13) Out Pulse High33 VSS GND — GND GND34 A14 Address signal (A14) Out Pulse High35 A15 Address signal (A15) Out Pulse High36 INIT PAD2 status — — —37 VPP PAD1 status — — —38 DSR Data set ready signal In High High39 KC4 Key common signal (KC4) Out Pulse High40 RD Output enable signal of RAM/ROM (RD) Out Pulse High41 WR Write enable signal of RAM (WR) Out Pulse High42 RA14 Address signal of ROM (Bank 0) Out High High43 ASTB Latch enable for Address decoder (ASTB) Out Pulse Low44 KI12 Key input signal (KI12) In High High45 KI13 Key input signal (KI13) In High High46 RA16 Address signal of ROM (Bank2) Out High High47 RA15 Address signal of ROM (Bank 1) Out High High48 MD Motor drive signal of printer (MD) Out Low Low49 DRW Drawer drive signal (DRW) Out Low Low50 BUZ Buzzer signal (BUZZ) Out Low Low51 FD Paper feed signal of printer (FD) Out Low Low52 HD.A Head drive signal of printer (HD.A) Out Low Low53 HD.B Head drive signal of printer (HD.B) Out Low Low54 HD.C Head drive signal of printer (HD.C) Out Low Low55 HD.D Head drive signal of printer (HD.D) Out Low Low4-2. CPU (uPD78052GC-093-3B9)www.freeservicemanuals.info3/22/15Digitized in Heiloo, Holland.