JVC VS-DT2000 Service Manual page 28

VS-DT2000
UPD780024AGKB62 (IC251) : Unit microcomputer
1. Terminal layout
64 49
1
48
16 33
17 32
2. Pin function
Pin No. Symbol I/O
1 P50/A8 -
2 P59/A9 -
3 MCS O
4 MRDY I
5 CDINDEX -
6 CDEMP -
7 CDTNO -
8 CDCOPY -
9 VSSO -
10 VDDO -
11 P30 -
12 P31 -
13 P32 -
14 /DRMUTE O
15 SUBQ I
16 P35/SO31 -
17 SQCK O
18 KCMND I
19 MSTAT O
20 KCLK I
21 RXDO I
22 TXDO O
23 P25/SCKO -
24 VDD1 -
25 AVSS -
26 VDTLV I
27 P16/ANI6 -
28 PCHK I
29 P14/ANI4 -
30 P13/ANI3 -
31 P12/ANI2 -
32 /REST I
33 SW1 I
34 AVREF -
35 AVDD -
36 /RESET I
37 XT2 -
38 XT1 -
39 IC -
40 X2 -
1-28
Connect to ground
Not use
Synchronous/asynchronous output
Ready signal input
Not use
Not use
Not use
Not use
Ground terminal
Power supply terminal
Not use
Not use
Not use
Mute signal output
Sub code Q data input
Not use
Clock output for sub code Q register
Command signal input
CD control status output
CD control command clock input
Command input
Status output
Connect to ground
Power supply terminal
Ground terminal
Sensitivity adjustment for vibrating detection
Not use
Voltage monitor (for safety)
Connect to ground
Connect to ground
Connect to ground
Rest switch input
Mechanism switch (Photo sensor)
Reference voltage for analog circuit
Power supply terminal for analog circuit
CD control reset input
Not use
Connect to power supply
Connect to ground
Connect to external crystal oscillator
Function