Sony MDR-NC500D Servise Manual page 26

MDR-NC500D
MAIN BOARD IC801 µPD78F0527GB (S)-UET-A (SYSTEM CONTROLLER)
Pin No. Pin Name
1, 2 INT1, INT0
3 AMUTE
4 DDCE
5 _RESET
6 BATTSEL
7 P123
8 FLMD0
P121/OCD0A,
9, 10
P122/OCD0B
11 REGC
12 VSS
13 VDD
14 SCLK
15 SDA
16, 17 P62, P63
18 LED_B
19 MONPATH
HYB2PATH,
20, 21
HYB1PATH
22, 23 P74, P73
24 KEYMON
25 KEYMODE
26 KEYPOWER
27 GPIO5
28 P31
29 GPIO4
30 LED_R
31 P16
32 DSPRST
33, 34 P14/RXD6, P13/TXD6
35 DR0
36 DX0
37 CLK0
38 AVREF
39 AVSS
40 VBAT
41 to 48 P26 to P20, P130
49 FSX0
50 FSR0
51, 52 REGION1, REGION0
26
I/O
O Interrupt signal output to the DSP
O Muting on/off control signal output to the power amplifi er
O DC/DC converter on/off control signal output terminal
System reset signal input from the reset signal generator and RESET switch
I
For several hundreds msec. after the power supply rises, "L" is input, then it change to "H"
Power supply selection signal output terminal
O
"L": rechargeable battery, "H": external DC power supply
O Not used
- Not used
O Not used
- External capacitor connection terminal
- Ground terminal
- Power supply terminal (+2.8V)
O Serial data transfer clock signal output to the stereo audio codec
O Serial data output to the stereo audio codec
O Not used
O LED drive signal output terminal for power on indicator
O Monitor signal on/off control signal output terminal
O Noise signal on/off control signal output terminal
O Not used
I MONITOR switch input terminal
I AI NC MODE switch input terminal
I POWER switch input terminal
I Signal input from the DSP
O Not used
I Signal input from the DSP
O LED drive signal output terminal for AI noise cancelling mode on indicator
O Not used
O Reset signal output to the DSP
O Not used
O Serial data output to the DSP
I Serial data input from the DSP
O Serial data transfer clock signal output to the DSP
I Reference voltage (+2.8V) input terminal
- Ground terminal
I Rechargeable battery power supply voltage detection signal input terminal (A/D input)
O Not used
O Frame sync signal output to the DSP
O Frame sync signal output to the DSP
I Input terminal for destination setting
Description
"L": muting on
"H": DC/DC converter on
"H": LED on
"H": monitor signal on
"H": noise signal on
"L": reset
"L": reset
"H": LED on