Casio CTK-650 Service Manual

Also see for CTK-650: Operation manual

Contents

Casio CTK-650 Service Manual Manual pdf 7 page image

— 5 —KEY TOUCH LSI(HG52E35P)By counting the time between the first key input signal FI and the second SI from the keyboard unit, the keytouch LSI detects key velocity of 256-step. Then the LSI sends the CPU note numbers and their velocities.Pin No. Terminal In/Out Function1 REQB Out Interrupt request. Not used.2,3 FI10,SI10 In Connected to +5V.4 VCC In +5V source.5 CRDB In Read enable signal.6 CWRB In Write enable signal.7 CCBB In Chip select signal.8 T In Test terminal. Connected to +5V.9 STYB In Standby terminal. Connected to +5V.10 RESB In Reset signal.11 W In Test terminal. Connected to +5V.12 CKI In External clock input.13 TMD In Test terminal. Connected to ground.14 TST In Test terminal. Connected to ground.15 CKO Out External clock output. Not used.16 GND In Ground(0V) source.17 XIN In Clock pulse input. Connected to ground.18 XOUT Out Clock pulse output. Not used.19 TRES In Test terminal. Connected to ground.20~28 CD0~CD7 In/Out Data bus.24 GND In Ground(0V) source.29~31 CA0~CA2 Out Address bus.32 VCC In +5V source.33~4333~4353~5553~5557~6357~63FI0~FI9FI0~FI9SI0~SI9SI0~SI9 In Key input signal.40 VCC In +5V source.44~53 KC0~KC7 Out Key scan signal.48,56 GND In Ground(0V) source.54 VCC In +5V source.KeyboardKC0~KC7FI0~FI9SI0~SI9Key Touch LSIHG52E35PRESBCCSBCWRBCRDBCKIP30/D0~P37/D7P12/A2~P10/A0 CA0~CA2CD0~CD7D0~D7A0~A2CPUHD6433298A16PP52/SCKA12A14P44/-WRP42/IRQ0P43/-RDP46/PHI