Sony ICD-37, Service Manual

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IC701 (SYSTEM CONTROLLER) µPD780308GC-A30-8EU (ICD-37) µPD780308GC-A31-8EU (ICD-57/67)
Pin No. Pin Name I/O Description
1 KEY0 I
Key input terminal (A/D input) S701 to S705 (STOP, REC START/STOP, Nx PLAY/STOP
(EXECUTE), – . (SELECT), > + (SELECT) ) keys input
2 KEY1 I
Key input terminal (A/D input) S707 to S709 (MENU, FILE, ERASE) keys input
3 SPDSW I
PLAY SPEED select switch (S712) input terminal (A/D input)
“L”: SLOW, “M”: FAST, “H”: NORMAL
4 XHOLD I
HOLD switch (S711) input terminal “L”: HOLD ON, “H”: HOLD OFF
5 LMUTE O
Line muting control signal output terminal “H”: line muting on
6 MICSEL O
Microphone sensitivity select signal output terminal
“L”: mic sensitivity low, “H”: mic sensitivity high
7 XFMCE O
Chip enable signal output to the flash memory (IC702) “L” active
8 VDD0 —
Power supply terminal (+3.3V)
9 AVREF I Reference voltage input terminal (for A/D converter)
10 XFMWE O
Write enable signal output to the flash memory (IC702) “L” active
11 XFMALE O
Address latch enable signal output to the flash memory (IC702) “L” active
12 VSS1 — Ground terminal
13 XFMBSY I
Ready/busy detection signal input from the flash memory (IC702) “L” active
14 XFMCLE O
Command latch enable signal output to the flash memory (IC702) “L” active
15 DSPMCK O Sampling frequency sync signal output to the digital signal processor (IC104) “H” active
16 DSPSSN O
Transmission status output to the digital signal processor (IC104) “L” active
17 XFMRE O
Read enable signal output to the flash memory (IC702) “L” active
18 NC — Not used (open)
19 XFMWP O
Write protect signal output to the flash memory (IC702) “L” active
20 XFMSE O
Spare space enable signal output to the flash memory (IC702) “L” active
21 BEEP O Beep sound drive signal output terminal (2.4 kHz) “H” active
22 PLLCRL O
Serial data transfer clock signal output to the divider (IC106)
Power on/off control signal output for the ADPCM (IC101), digital signal processor (IC104),
divider (IC106) and LED power supply “H”: power on
23 to 26 COM0 to COM3 O
Common drive signal output to the liquid crystal display (ND701) “H” active
27 BIAS O
Power supply output terminal for the liquid crystal display (ND701) “H” active
28 to 30 VLC0 to VLC2 I
Power supply input terminal for the liquid crystal display (ND701) “H” active
31 VSS0 —
Ground terminal
32 to 61 S0 to S29 O
Segment drive signal output to the liquid crystal display (ND701) “H” active
62 NC —
Not used (open)
63 APOWER O
Power on/off control signal output for the mic amplifier (IC103) and AGC (IC107)
“H”: power on (rec mode)
64 XTEST I Setting terminal for the test mode “L”: test mode (Normally: fixed at “H”)
65 DSPSTP O
Stop signal output to the digital signal processor (IC104) “L” active
66 LEDREC O
LED drive signal output of the REC indicator (D504 red) “H”: LED on (rec mode)
67 LEDPB O LED drive signal output of the PLAY indicator (D504 green) “H”: LED on (play mode)
68 AMPPOW O
Power on/off control signal output to the power amplifier (IC102)
“H”: power on (play mode)
69 XSPOWER O
Power on/off control signal output for analog power supply to the DC/DC converter circuit
“L”: power on
70 RTCCE O Chip enable signal output to the real time clock (IC703) “H” active
71 DSPRST O
Reset signal and power down detection signal output to the digital signal processor (IC104)
“H”: reset or power down