User's Manual
23
CPU Pins
Pin No. Pin Name I/O Description
1 SQ I Squelch detect input
2 EXT-PTT I External Mic PTT detect pin
3 TIBI I
CTCSS/CDCSS external circuit central point
input
4 TI I CTCSS/CDCSS signal input
5 NC -
6 NC -
7 CNVSS
8 RESET I Reset detect pin
9 XOUT2 O
10 XIN2 I
Auxiliary oscillator pin, connected with
32.768KHz crystal
11 VSS CPU Ground
12 XIN1 I
13 XOUT1 O
Master oscillator pin, connected with
4.9152MHz crystal
14 VCC CPU main power supply
15 VCO-CTRL O VCO power supply control
16 RX-CTL O Receiving circuit power supply control
17 RX-MUTE O Receiving tone output control
18 TONE O TONE output pin
19 TX-CTL O Transmit circuit power supply control
20 APA-EN O AF power amplifier power control
21 MIC-EN O MIC Enable
22 LED2 O
23 LED1 O
LED control
24 COM1 O
25 COM2 O
26 COM3 O
27 COM4 O
LCD COM control