Kenwood KRF-X7775D Service Manual page 8

KRF-X7775D/X7775D-S/VR-5080/5090
6-2 Port Description of Main Microcomputer : uPD784217A516 (X13, IC3)
Port No. Port Name
1 REM DA
2 REM CK
3 FL CLK
4 FL DIN
5 FL DOUT
6 FL STB
7 FL RST
8 ENC B
9 VDD
10 ENC A
11 SEL CLK
12 SEL DATA
13~15 SEL STB1~3
16 TONE CLK
17 TONE DATA
18 TONE STB
19 VOL CLK
20 VOL DATA
21 VOL STB2
22 TEST/VPP
23 STEREO
24 SD
25 RF PLL CLK
26 RF PLL DATA
27 PLL DO
28 PLL CE
29 T MUTE
30 RF PLL CE
31~33 P MACRO A~C
34 TV SENS
35 VOL STB1
36 S DATA
37 VDD
38 X2
39 X1
40 VSS
41 XT2
42 XT1
43 RESET
44 CE
45 S BUSY
46 232C DET
47 RDS CLK
48 POWER KEY IN
49 REM1
50 REM2
8
CIRCUIT DESCRIPTION
I/O
O IR transmitter IC(X13,IC5) control data output.
O IR transmitter IC(X13,IC5) control clock output.
O Clock output to FL driver.
I Data input from FL driver.
O Data output to FL driver.
O Strobe output to FL driver.
O Reset output to FL driver.
I Input port of volume encoder.
- +5V power supply.
I Input port of volume encoder.
O Clock output to selector IC.
O Data output to selector IC.
O Strobe (1~3) output to selector IC.
O Clock output to tone control / selector IC.
O Data output to tone control / selector IC.
O Strobe output to tone control IC.
O Clock output to volume IC.
O Data output to volume IC.
O Strobe 2 output to volume IC.
- Connected to GND.
I Tuner stereo signal detection port.
I Tuner SD signal detection port.
Clock output to PLL (LC72131) IC.
✽ Clock output to PLL IC (LV2105V) for RF remote controller.
O
✽ Except KRF-X7775D/9995D
Data output to PLL(LC72131) IC.
✽ Data output to PLL IC (LV2105V) for RF remote controller.
O
✽ Except KRF-X7775D/9995D
I Data input from PLL (LC72131)IC.
O Chip enable to PLL (LC72131) IC.
O Mute control to tuner.
O PLL (LV2105V)CE for RF remote controller. (VR series only)
O Output port for perfect macro (A~C). ( Refer to 7-6)
I Detection port of TV signal. ( Refer to 7-7)
O Strobe 1 output to volume IC.
I/O SL16 data input/output.
- +5V power supply
- Crystal resonator (12.5MHz) connection.
- Crystal resonator (12.5MHz) connection.
- Connected to GND.
- Unused.
- Unused.
I Reset signal input for main microcomputer.
I Detection port of chip enable.
I/O Busy signal input/output.
I Detection port of RS232C communication. (Except KRF-X7775D)
I Clock input of RDS demodulator IC. (E/T type only)
I Detection port for power key.
I Remote control signal input 1 (front panel).
Remote control signal input 2 (IR receiver).
I
Except KRF-X7775D (X/M/V)and KRF-X9995D (M/X)
Function