Yamaha A-S700 - Amplifier, Service Manual

Page: 27 / 61

27
A-S700
A
-S70
0
Pin
No.
Port Name Function Name I/O Detail of Function
1 P96/ANEX1 O
2 P95/ANEX0 O
3 P94 O
4 P93 DEST1 I
5 P92/TB2in DEST0 I
6 P91/TB1in MOD1 I
7 P90/TB0in MOD0 I
8 BYTE BYTE MCU Vss: when single chip mode is used (Gnd)
9 CNVss MCU CNVss
Vss: when single chip mode is used
Vcc: when flash writing is used
(Pull down)
10 P87/Xcin /CEEEP O EEPROM CE
11 P86/Xcout O
12 /RESET /RESET MCU Reset
13 Xout Xout MCU Oscillator out
14 Vss Vss MCU Ground (Gnd)
15 Xin Xin MCU Oscillator in
16 Vcc1 Vcc MCU Power supply, +5V (Vcc)
17 P85/NMI NMI I Connect to vcc because it is unused (Pull up)
18 P84/INT2 /POMT O Pre out mute
19 P83/INT1 LED_SP O POWER indicator
20 P82/INT0 PDET IRQ Power down detect
21 P81 O
22 P80 O
23 P77 O
24 P76 /POMT O
25 P75/TA2in /Z2MT O
26 P74/TA2out O
27 P73/CTS2/RTS2/TA1in XMPWR O
28 P72/CLK2/TA1out /ICXM O
29 P71/RXD2/SCL2/TA0in DRXM SI
30 P70/TXD2/SDA2/TA0out DTXM SO
31 P67/TXD1/SDA1
DTEV SO
TXDF SO
32 P66/RXD1/SCL1
CEEV O
RXDF SO
33 P65/CLK1
CKEV SO
CLKF SO
34 P64/CTS1/RTS1/CTS0/CLKS1 BSY O
35 P63/TXD0/SDA0 DTIS SO Input selector Tx DATA
36 P62/RXD0/SCL0 CEIS O Input selector CE
37 P61/CLK0 CKIS SO Input selector CLOCK
38 P60/CTS0/RTS0 DTRZ O Rec selector DATA
39 P57/RDY/CLKout CKRZ O Rec selector CLOCK
40 P56 O
41 P55 /EMP I For flash writing (LO) (Pull down)
42 P54 CER O
43 P53 SCKR O
44 P52 SDRR I
45 P51 SDTR O
46 P50 /CE I For flash writing (HI) (Pull up)
47 P47 CEP O
48 P46 SCKP O
49 P45 SDTP O
50 P44 /TMU O
51 P43 SDRP I+
52 P42 TUNED I+
53 P41 /ST I+
54 P40 O
55 P37 LED_PHO O Input indicators (PHONO)