Upd780076Gk-533(Ic251):Unit Microcomputer - JVC XL-R5020BK Service Manual

XL-R5020BK

5.17UPD780076GK-533(IC251):Unit microcomputer

• Pin layout
• Pin layout
Pin No. Symbol I/O
1 E2SCK O Serial clock output to IC201
2 E2SDL I/O Serial data input/output with IC201
3 MCS I
4 MRDY O Signal output to system microcomputer by which command can be received
5 ITRVP3 I
6 ITRVP2 I
7 ITRVP1 I
8 ITRYSoc I
9 VSS0 -
10 VDD0 -
11 RESET I
12,13 -
14 ICAMP1 I
15 KCMND/TXD I/O Command input from system microcomputer (synchronization) or status output (asynchronous)
16 MSTAT/RXD I/O Status output to system microcomputer (synchronization) or command input (asynchronous)
17 KCLK I
18 SUBQ I
19 CDCOPY O Right or wrong of CD copy signal output
20 SQCK O Clock output for sub code Q register
21 CDINDEX O CD index information
22 CDTNO O CD track information
23 ICAMP2 I
24 VDD1 -
25 AVSS -
26 VDET_LEVEL I
27 KEY2 I
28 TRY3CLOSE I
29 TRY3OPEN I
30 TRY2CLOSE I
31 TRY2OPEN I
32 TRY1OPEN I
33 TRY1CLOSE I
34 AVREF -
35 CAM_CW O Cam motor drive signal output (clockwise)
36 RESET I
34
Communication method selection input from system microcomputer
L : Synchronization H : Asynchronous
L H : Status output enable H L : command can be received
Play position switch (SW3) detection input
Play position switch (SW2) detection input
Play position switch (SW1) detection input
Sub tray open/close detection switch input
Connect to ground
Power supply terminal (+)
REST switch detection input (traverse mechanism)
Non connect
Cam switch position 1 input
System microcomputer data/serial/clock input
Sub code Q data input
Cam switch position 2 input
Power supply terminal (+)
Connect to ground for A/D converter
Input for vibration detecting changeable level
Output voltage monitor of regulator (IC291)
Main tray 3 close switch detection input
Main tray 3 open switch detection input
Main tray 2 close switch detection input
Main tray 2 open switch detection input
Main tray 1 open switch detection input
Main tray 1 close switch detection input
Standard voltage of A/D converter and analog power supply
System reset input
Description
UPD780076GK-533 1/2