Ic Description - Pioneer CJ-V55 Service Manual

CJ-V55
8. 1C DESCRIPTION
■ PD0073
System control
• Pin functions
+ 5V power supply (±5%)
Key scan and 8-segment LED drive.
5
?
Bus timing signal for access the ROM
peripheral.
Interrupt signal by diode OR to the' input
signal of the coin and bill._
Connect to Vss
CD player channel seiecter. Control the IC4.
SLPO
SLP1
ON channel
of IC4
CD player
1 1 Y0, X0 PL1
0 1 Yl, XI PL2
0 1 Y2, X2 PL3
0
0 Y3, X3 N.C.
Bus timing signal , for access the ROM
peripheral.
Data terminal ready from the CD player 3.
0 at connecting the CD player.
Data terminal ready from the CD player 2.
0 at connecting the CD player.
Data terminal ready from the CD player 1.
0 at connecting the CD player. ■
Door switch input. 0 at close.
Non connection
Key scan input.
Mechanical counter drive output
Buzzer drive output
Money received signal from the coin acceptor
(Normal : 1
Money received : 0 for about 45 through
50msec.
Asynchronous serial
Baud rate : 4800bps
Data bit : 8bit
Stop bit : Ibit
Command transmission to the CD player.
Asynchronous serial
Baud rate : 4800bps
Data bit : 8bit
Stop bit : lbit
Status reception from the CD player.
Pulse signal input for control the menu
board rotation. Normal speed l.SkHz.
Address bus for access the IC3
(RAM) and IC2 (I/O controller)
peripheral.
Address
RAM : IN3 Zt/xfirp ~ 3FFF
Peripheral :IC2 Acf)<p(/i — 4<t>4>7
Address
of IC2
Generally, use for the port. Set to input at
the rising up the power only, and estimate
.the. OFF. time of . the power either discharge
the capacitor or not.
After the confirmation, output 1 and charge
it. This function is for clearing the music
selection and credit of the previous day.
D05
D04-
Non connection
Data bus--for access the IC3 (RAM)
and IC2 (I/O controllwe) peripheral.
102