Kenwood KVT-910DVD Service Manual page 27

MICROCOMPUTER'S TERMINAL DESCRIPTION
GTU-SYSTEM U-COM (IC31:X25-862X-XX) µPD784215GC-206
Pin Name
1 OFF_REQ_P
2 ON_REQ_P
3 NC
4 ILL_ON
5 A
6 NC
7 NC
8 NC
9 Vdd
10 X2
11 X1
12 Vss
13 XT2
14 XT1
15 RESET
16 NC
17 R_CLK
18 REQC
19 BRST_P
20 BCS_P
21 BCD_P
22 BIRQ_P
23 AVdd
24 AVref0
25 PHONE
26 NC
27 NOISE
28 SMETER
29 NC
30 NC
31 IF_MODE
32 NC
33 AVss
34 NC
35 NC
36 AVref1
37 BDIC_P
38 BDCOM_P
39 BCLK_P
40 DATAC
41 DATAH
42 CH_CLK
I/O Function
I BUS off Request
I BUS on Request
O Not used
O ILLUMI output terminal
O Not used
O Not used
O Not used
O Not used
- Main power input
- Main system clock oscillation terminal
- Main system clock oscillation terminal
- GND terminal
- Sub system clock oscillation terminal
- Sub-clock input
I Reset input
O Not used
I RDS clock input
I handshake request from changer
O IE-Bus reset
O IE-Bus chip select
O IE-Bus Command/Data
I IE-Bus IC request
- Analog power source for A/D
- Reference voltage input for A/D
I PHONE detection
I Not used
I FM noise detection
I FM Smeter detection
I Not used
I Not used
I IF condition detection for K21
I Not used
- A/D GND terminal
O Not used
O Not used
- Reference voltage input for D/A
I Bus IC data input
O Bus IC data output
O Bus IC clock out
I Data line from changer
O Data line to changer
I/O Clock line with changer
KVT-910DVD/920DVD/930DVD/
940DVD/960DVD
L: BUS OFF
L: BUS ON
H : ILL ON
L: RST
L: Request
L: RST
L: CS
H: Control mode, L: Read-Write mode
NAV2.5V↑, PHONE1V↓
A/D input
A/D input
Reading port
Maintain last
Input port while changer control is OFF
Description of Processing
29