TC-600 Service Manual
16
CPU Pins
35
ENC0
I
Channel Selector Knob encode input
36
ENC1
I
37
ENC2
I
38
ENC3
I
39
AF_MUTE
O
AF mute control
Pin No.
Pin Name
I/O
Description
1
TI
I
CTCSS/CDCSS input
2
BUSY
I
Busy signal input
3
BATT
I
Battery voltage detect
4
TIBI
I
CTCSS/CDCSS external circuit center point input
5
NC
6
SAVE
O
Battery save control
H: OFF
L: ON
7
TXLow
O
TX power control
H: Low power
L: High power
8
LE
0
PLL IC enable
9
PLL_DAT
O
PLL data output
10
PLL_CLK
O
PLL clock output
11
TTSin
I
2-Tone input
12
BEEP
O
BEEP output
13
SCL
O
E
2
PROM clock line
14
SDA
I/O
E
2
PROM data line
15
MUTE
O
MIC mute control
H: MIC mute
L: MIC enable
16
MS1
O
Model select
17
GLED
O
Green light control
H: Lit
18
RLED
O
Red light control
H: Lit
19
TXD
O
RS-232C output
20
RXD
I
RS-233C input
21
PTT
I
PTT key input
L: Press
22
NC
I
23
RXC
O
Receiver power supply control
L: ON
24
NC
I
NC
25
RESET
I
Reset input
26
SELF
I
Self programming
L: ON
27
TXC
O
Transmitter power supply control
H: ON
28
Xin
I
Oscillator input
29
Xout
O
Oscillator output
30
Vss
I
GND
31
RT
O
RX/TX control
H: RX
L: TX
32
UL
I
PLL unlock detect
H: Lock
L: Unlock
33
IF_CTRL
I
IF select
H: 21.4MHz
L: 45.05MHz
34
MONI
I
Function key input
L: Press