Microprocessor Extended Port - Yamaha A-S3000 Service Manual

• Microprocessor extended port

IC402: LC709004AMJ-AH (FRONT (1) P.C.B.)
I/O-expander for microprocessor
DIN
CLK#
CS#
RES#
Pin
Port Name
No.
1 DOUT
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
Serial/parallel converter/shift register
2
3
4
I/O control/output register
6
port 0 I/O buffer
24
Function Name
I/O
(P.C.B.)
DOUT SO Data Out
DIN SI Data In
CLK SI Clock
CS I Chip Select
VDD Power supply
RES I Initial Clear
VSS GND
NC
MTR MT O H/HiZ: OFF, L: ON (Mute)
COLOR I Color of main unit: H: BL, L: SI
MTR_ATT O H/HiZ: OFF, L: ON (ATT.)
L (ON) when without HP, H (OFF) with HP inserted
PK/N_VU O H: Peak mode, L: VU mode
MTR_OFF O / HiZ High/Open becomes Mute off by using Mute/Low
RY_HP O On when Headphone is detected
LED is turned on when Mute lever on the front and Mute key of remote controller are
LED_MT HiZ
activated
VDDP1 +5S power supply
LED_MDIR HiZ LED tuned on when INPUT MAIN DIRECT is selected
LED_PHONO HiZ LED turned on when INPUT PHONO is selected
LED_BAL2 HiZ LED turned on when INPUT BAL 2 is selected
LED_BAL1 HiZ LED turned on when INPUT BAL 1 is selected
LED_LINE2 HiZ LED turned on when INPUT LINE 2 is selected
LED_LINE1 HiZ LED turned on when INPUT LINE 1 is selected
LED_TU HiZ LED turned on when INPUT TUNER is selected
LED_CD HiZ LED turned on when INPUT CD is selected
1
5
7
port 1 I/O buffer
17 15 8 16
Detail of Function
A-S3000
DOUT
VDD
VSS
39