Sherwood R-772 Service Manual page 16

3. Pin Function
Pin No. Symbol
1 SUB_DATAOUT
2 SUB_CLK
3 NC
4 FL_CE
5 FL_CLK
6 FL_DATA
7 RMC
8 BYTE
9 CNVSS
10 STBY_RLY
11 NC
12 RESET
13 XOUT
14 VSS
15 XIN
16 VCC1
17 NMI
18 CENTER_RLY
19 SUR_RLY
20 FRONT_RLY
21 SB_RLY
22 NC
23 HP_RLY
24 S_MUTE
25 SB_MUTE
26 C_MUTE
27 F_MUTE
28 DC_OUT
29 RF_RMC_RX
30 RF_RMC_TX
31 RS232_TX
32 RS232_RX
33 NC
34 NC
35 NC
36 NC
37 SPK_B_RLY
38 SW_MUTE
39 NC
40 R2_MUTE
41 UPGRADE(EPM)
42 NC
43 4053_CONT
44 NC
45 NC
46 UPGRADE(CE)
47 NJW1197_LATCH
48 NJW1197_CLK
49 NJW1197_DATA
Serial data signal Output to submicom
Output Clock Signal for submicom.
Not used!
Output for chip enable of SC16315
Clock signal output for SC16315
Data signal output for SC16315
Input for remocon data.
The data bus is 16 bits long when the this pin is held "L"
Switches the data bus in external memory space.
Output to "STBY Relay ON/OFF" (At "H", it is active)
Not used!
Input for resetting the CPU(At "L", it is active)
Output for 12MHz crystal oscillator
Ground
Input for 12MHz crystal oscillator
+3.3V power supply
Input pin for the "NMI" interrupt.
Output to "Center Relay ON/OFF" (At "H", it is active)
Output to "Surround Relay ON/OFF" (At "H", it is active)
Output to "Front Relay ON/OFF" (At "H", it is active)
Output to "Surroundback Relay ON/OFF" (At "H", it is active)
Not used!
Output to "Headphone Relay ON/OFF" (At "H", it is active)
Output for surround channel mute(At "L", it is active)
Output for surround back channel mute(At "L", it is active)
Output for center channel mute(At "L", it is active)
Output for front channel mute(At "L", it is active)
Control for "+12V(DC) ON/OFF" (At "H", it is active)
Serial data signal Input from RF REMOCON
Serial data signal Output to RF REMOCON
Serial data signal Output from "ST3232E"
Serial data signal Input from "ST3232E"
Not used!
Not used!
Not used!
Not used!
Output to "Speaker B Relay ON/OFF" (At "H", it is active)
Output for subwoofer channel mute(At "L", it is active)
Not used!
Output for R2 mute(At "L", it is active)
UPGRADE
Not used!
Output for control signal of 4053.
Not used!
Not used!
UPGRADE
Latch signal output for NJW1197.
Clock signal output for NJW1197.
Data signal output for NJW1197.
15
Description