JVC VS-DT2000R Service Manual page 26

VS-DT2000R
UPD780024AGKB62 (IC251) : Unit microcomputer
1. Terminal layout
64 49
1
48
16 33
17 32
2. Pin function
Pin No. Symbol
1 P50/A8
2 P59/A9
3 MCS
4 MRDY
5 CDINDEX
6 CDEMP
7 CDTNO
8 CDCOPY
9 VSSO
10 VDDO
11 P30
12 P31
13 P32
14 /DRMUTE
15 SUBQ
16 P35/SO31
17 SQCK
18 KCMND
19 MSTAT
20 KCLK
21 RXDO
22 TXDO
23 P25/SCKO
24 VDD1
25 AVSS
26 VDTLV
27 P16/ANI6
28 PCHK
29 P14/ANI4
30 P13/ANI3
31 P12/ANI2
32 /REST
33 SW1
34 AVREF
35 AVDD
36 /RESET
37 XT2
38 XT1
39 IC
40 X2
1-26
I/O
- Connect to ground
- Not use
O Synchronous/asynchronous output
I Ready signal input
- Not use
- Not use
- Not use
- Not use
- Ground terminal
- Power supply terminal
- Not use
- Not use
- Not use
O Mute signal output
I Sub code Q data input
- Not use
O Clock output for sub code Q register
I Command signal input
O CD control status output
I CD control command clock input
I Command input
O Status output
- Connect to ground
- Power supply terminal
- Ground terminal
I Sensitivity adjustment for vibrating detection
- Not use
I Voltage monitor (for safety)
- Connect to ground
- Connect to ground
- Connect to ground
I Rest switch input
I Mechanism switch (Photo sensor)
- Reference voltage for analog circuit
- Power supply terminal for analog circuit
I CD control reset input
- Not use
- Connect to power supply
- Connect to ground
- Connect to external crystal oscillator
Function