HYT TC-446, Service Manual

Page: 14 / 54

TC- 446 Service Manual
－
12
－
CPU Pins
PIN No. PIN NAME I/O DESCRIPTION
1 TI I CTCSS/CDCSS input
2 BUSY I Input busy signal
3 BATT I Detect battery voltage
4 TIBI I CTCSS/CDCSS exterior circuit central point input
5 NC
6 SAVE O Power saving control H: OFF L: ON
7 TXLow O Transmitter power control H: Low power L: High power
8 NC
9 DAT O data output
10 CLK O clock output
11 LE O PLL IC enable
12 BEEP O Beep output
13 SCL O E
2
PROM clock cable
14 SDA I/O E
2
PROM data cable
15 MUTE O MIC mute control H: Mic mute L: Mic enable
16 MS1 I Model set
17 GREEN O Green light control H: light
18 RED O Red light control H: light
19 TXD O RS-232C output
20 RXD I RS-233C input
21 PTTK I PTT key input
22 MS2 I Standard model select H: Non-standard L: Standard
23 RXC O Receiver power control L: power on
24 NC
25 RESET I Reset input
26 SELF I Self-program L: on
27 TXC O Transmitter power control H:on
28 X
IN
I Oscillator input
29 X
OUT
O Oscillator output
30 Vss I Grounding
31 R/T O TX/RX control H
：
RX L
：
TX
32 UL I PLL unlock detector H: Lock L: unlock
33 IF-SELECT I IF select H: 21.4MHz L: 45.05MHz
34 MONIK I MONI key input
35 ENC0 I Channel selector knob encode input
36
ENC1
I
37
ENC2
I