Service Manual

19
pin and the grounded Vss. When not
downloading, only a resistor of 47K is connected
between the pin and the grounded Vss.
14 X0 OSC0 OSC0
15 X1 OSC1 OSC1
Connecting pin of 7.3728MHzMHz master
crystal oscillator
16 Vss GND GND
Power supply (GND) pin (When recording, it is
connected with the GND recording port signals.)
17 Vcc VCC VCC
MCU 5V power supply (When recording, it is
connected with the VCC recording port signals)
18 PG0 C C
This port can not be used as IO and a capacitor
is connected between the port and the grounded
Vss.
19 PG2/X1A OSC32K OSC32K
20 PG1/X0A OSC32K OSC32K
Subsystem clock pin (Reserved）
21 /RST RESET RESET I
Reset (When recording, it is connected with the
RSTX recording port signals.)
22 P00/INT00 Reserve Reserve O
23 P01/INT01 Reserve Reserve O
24 P02/INT02 Reserve Reserve O
25 P03/INT03 Reserve Reserve O
Reserved
26 P04/INT04 PLLEN2 PLLEN2
I/
O
PLL ENABLE
27 P05/INT05
PLLDATA
2
PLLDATA
2
I/
O
PLL DATA
28 P06/INT06 PLLCLK2 PLLCLK2
I/
O
PLL CLOCK
29 P07/INT07 UL2 UL2
I/
O
TB31202 PLL circuit unlock detect (H: Lock
L Unlock) (connected with pull-up resistor )
30 P10/UI0 RXD RXD I
UART RX (When recording, it is connected with
the UI recording port signals)
31 P11/UO0 TXD TXD O
UART TX (When recording, it is connected with
the UO recording port signals)
32 P12/UCK0 Reserve Reserve O Reserved
33
P13/TRG0/A
DTG
Reserve Reserve I Reserved
34 P14/PPG0 MIC_EN MIC_EN I
Check whether the MIC is connected(connected
with pull-down resistor) (valid at high level)
35 P20/PPG00 CTC_DCS CTC_DCS
P
W
M
CTCSS/CDCSS output
36 P21/PPG01 Reserve Reserve O Reserved
37 P22/TO00 TONE TONE O BEEP tone output/CALL tone output
38 P23/TO01 W/N W/N O Wide/Narrow band control W(L)/N(H)
39 P24/EC0 Reserve Reserve O Reserved