Sony MZ-R50 - MD Walkman MiniDisc Recorder Service Manual page 37

IC801 SYSTEM CONTROL (CXP81960M-652R)
Pin No. Pin name
1 CLCS
2 XRST
3 WRPWR
4 TX
5 SENSE
6 LDON
7 XSHOCK
8 ––––
9 INLS
10 PROTECT
11 DATA
12 HOLD
13 WP
14 OPEN
15 CLOCK
16 CLK SDIO
17 EVR DATA
18 PUSH JOG
19 LCD STB
20 CL SCK
21 SDI2
22 SYNC REC
23 D. B. B
24 XLINEDET
25 AVLS
26 XTEST
27 XDCIN
28 KANA SE L
29 AM3 ON
30 XP CONT
31 LIP ON
32 XREC LED
33 MODE2
34 MODE1
35 XRF STBY
36 XLCD ON
37 MP
38 XMRST
39 V
SS
40 XTAL
41 EXTAL
42 CS
43 ––––
44 LCD DATA
45 LCD SCK
46 ––––
47 ––––
48 HIDCMNT
49 KEYR
50 AV
SS
I/O
O Chip select output to real time clock (IC804).
O Reset output. L : Reset
O Laser power switching signal output.
O Write data transfer timing output.
I Internal status (SENSE) input.
O Laser ON signal. H : ON
I Track jump detection input.
– Not used (Open).
I Detecting switch for internal circuit of sleding.
I Disc write protect switch.
O Data output to remote control.
I Hold switch input (This unit). L : Hold
I Wake-up signal input from remote control key and this unit key.
I Detecting switch for opening and closing of the upper cover. Close : L
I CLOCK SET switch input.
I Serial clock input.
I Electric volume control data input.
I Push JOG switch input.
O LCD standby output.
O Serial clock output for real time clock (IC804).
I Serial data input.
I SYNCHRO REC switch input.
I DIGITAL MEGA BASS switch input.
I Line input detect. L : Line
I AVLS switch input. L : ON
I Test mode terminal. L : Test mode
I DC input detect. L : DC IN
– Not used (Fixed at "H").
O This is at "H" level during external battery operation.
O Power control output. L : ON
O Outputs H while operating with a lithium battery.
O REC LED control. L : ON
O
Head drive (IC506) control signal output.
O
O Power control output to RF amplifier (IC501).
O LCD ON/OFF control.
– Microprocessor mode input (Fixed at "L").
I Microprocessor reset input.
– Ground.
– System clock (12MHz).
– System clock (12MHz).
– Chip Select input (Connected to +2.8V).
– Not used (Fixed at "L").
O LCD data output.
O Serial clock output.
– Not used (Open).
– Not used (Open).
I Voltage monitor DC input.
I Remote control key input.
– Ground terminal for A/D converter.
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Description
Internal circuit : L
H : Protect
L : ON