Kenwood KDC-8024 Service Manual page 10

KDC-8024
MICROCOMPUTER'S TERMINAL DESCRIPTION
Pin No. Pin Name
35 TX1
36 TX2
37 REGC
38 X1
39 X2
40 Vss
41 VDD
42 CLKOUT
43~47 NC
48 FL+3.3V
49 FL+B
50~57 NC
58 Vdd
59 Vss
60~69 NC
70 VOLUME B
71 VOLUME A
72 SA RST
73 AV CONT
74 Avdd
75 Avss
76 Avref
77 F01
78 F02
79 F03
80 F04
81 F05
82 F06
83 WAVE IN
84~88 KR5~KR1
89 SC REQ
90 NC(FAC IN)
91 SC CON
92 OPEN KEY
93 SRC KEY
94 NC
95 MC REQ
96 NC
97~99 NC
100 NC
10
I/O Purpose / Description
-
-
-
- Main clock.
- Main clock.
- Vss
- Vdd
-
O
O FL3.3V ON/OFF.
I/O FL+B ON/OFF.
O
- Vdd
- Vss
O
I VOL input.
I VOL input.
O Spectrum analyzer IC reset.
O VREF control.
- Vdd
- Vss
-
I BPF (63Hz)
I BPF (150Hz)
I BPF (330Hz)
I BPF (1kHz)
I BPF (3.3kHz)
I BPF (10kHz)
I Audio input.
I Key return.
Communication request to system µ-com.
O
O
Panel µ-com control.
I
I OPEN key input.
I SRC key input.
O
Communication request from system µ-com.
I
O
O
O
Procesing Operation
Connect to 1µF capacitor.
20MHz
20MHz
Output : L
Hi-Z : OFF, L : ON (Time constant check, 1ms)
Hi-Z : OFF, L : ON (Time constant check, 35µs)
Output : L
Output : L
H : reset, L : Normally
Operation : H
Connect to 73 pin.
H : Request
Output : L
H : Operation
H : OFF, L : ON
H : OFF, L : ON
Output : L
H : Request (Reset, low current consumption mode
: System µ-com output "L")
Output : L
Output : L (Flash µ-com writing port)
Output : L