Yamaha A-S2100 Service Manual page 48

A-S2100
• Microprocessor extended port
IC402: LC709004AMJ-AH (FRONT (1) P.C.B.)
I/O-expander for microprocessor
Pin
Port Name
No.
2 DIN
3 CLK#
4 CS#
5 VDD
6 RES#
7 VSS
8 P17
9 P16
10 P15
11 P14
12 P13
13 P12
14 P11
15 P10
16 VDDP1
17 P07
18 P06
19 P05
20 P04
21 P03
22 P02
23 P01
24 P00
48
Serial/parallel converter/shift register
DIN 2
CLK# 3
CS#
4
RES#
6
port 0 I/O buffer
24
Function Name
(P.C.B.)
DIN SI
CLK SI
CS I
VDD
RES I
VSS
NC
MTR MT O
COLOR I
MTR_ATT O
PK/N_VU O
MTR_OFF O
RY_HP O
LED_MT HiZ
VDDP1
LED_MDIR HiZ
LED_PHONO HiZ
HiZ
LED_BAL1 HiZ
LED_LINE2 HiZ
LED_LINE1 HiZ
LED_TU HiZ
LED_CD HiZ
I/O control/output register
port 1 I/O buffer
17 15 8
I/O
Data In
Clock
Chip Select
Power source
Initial Clear
GND
Hi/HiZ: OFF, Low: ON (Mute)
O O Main unit color / Hi: BL, Low: SI
Hi/HiZ: OFF / Hi: HP inserted (OFF), Low: when no HP (ON: ATT)
Hi: Peak mode, Low: VU mode
HiZ HiZ Hi/Hiz: Meter Off
ON when the headphone is detected
LEDs are made to turn on when the MUTE lever on the front
and the MUTE key of the remote control unit are operated
+5S power
LED is turned On when INPUT MAIN DIRECT is selected
LED is turned On when INPUT PHONO is selected
LED is turned On when INPUT BAL is selected
LED is turned On when INPUT LINE2 is selected
LED is turned On when INPUT LINE1 is selected
LED is turned On when INPUT TUNER is selected
LED is turned On when INPUT CD is selected
1 DOUT
5
VDD
7 VSS
16
Detail of Function