RED PT500-2, Service Manual

Page: 28 / 62

PT500-2 Service Manual
28
Pin No. Port Name
Pin
Name
I/O
Active
Level
Function
1 APCSW P33 O H APC switch
2 PTT P34 I L PTT switch input
3 MODE - - -
Connect this pin to VCC via a 4.7K
resistor(*Burn)
4 SK1 P43 I L SIDE KEY1 input
5 SK2 P44 I L SIDE KEY2 input
6 RESET - I L CUP reset (*Burn)
7 XOUT - O - MCU clock
8 VSS - - - GND
9 XIN - I - MCU clock
10 VCC - - - +3V
11 BSHIFT P54 O H Beat shift switch
12 F_CS P53 O L FLASH chip select output
13 F_DI P52 O - FLASH data in
14 F_CLK P51 O - FLASH serial clock output
15 F_DIO P50 I/O - FLASH data input/output
16 NC P27 O -
17 VCCN P26 O -
Frequency regulation output
（
PWM
）
18 DCSTCXO P25 O -
CTCSS/DCS output
（
PWM
）
19 PLL_CLK P24 O H PLL clock Output
20 PLL_DAT P23 O - PLL data Output
21 PLL_EN P22 O H PLL enable
22 DCSVCO P21 O -
CTCSS/DCS output
（
PWM
）
23 PLL_UL P20 I H PLL unlock detect pin
24 RXVCO P17 O H TX/RX VCO selection(H,RX)
25 BEEP_AF P16 O - Local Beep Control Pin
26 RXD0 P15 I - Serial data
27 TXD0 P14 O - Serial data