TC-508 Service Manual
13
CPU Pins
Pin No.
Port Name
Pin Name
I/O
Function
1
NC
/
/
/
2
NC
/
/
/
3
NC
/
/
/
4
NC
/
/
/
5
NC
/
/
/
6
TXD
TXD
O
UART
TxD
7
RXD
RXD
I
UART
RxD
8
P60
APA_EN
O
Speaker control pin (H: on; L: off)
9
P61
SAVE_CTL
O
Battery save control pin. In non-battery-save
status, it is set to high level.
10
P62
EXT MIC
I
For checking MIC connection (valid at high level)
11
P63
EXT PTT
I
Earpiece PTT input pin (valid at high level)
12
P64
Red LED
O
Red LED indicator pin
13
P65
Green LED
O
Green LED indicator pin
14
P66
R/T
O
For TX/RX control (H: RX; L: TX)
15
P67
RX_CTRL
O
For RX power control (valid at high level)
16
Vssd
GND
S
Power ground for digital circuit
17
Vddd
VCC
（
3.0V
）
S
Power supply for digital circuit
18
P50/INT0
Reserve
O
Reserved
19
P51/INT1
Reserve
O
Reserved
20
P52/INT2
Reserve
O
Reserved
21
P53/INT3
SK2
I
Programmable SK2 pin (valid at low level,
connected with pull-up resistor)
22
P54/INT4
SK1
I
Programmable SK1 pin (valid at low level,
connected with pull-up resistor)
23
P55/INT5
PTT
I
PTT key pin (valid at low level, connected with
pull-up resistor)
24
P56/INT6
Reserve
O
Reserved
25
P57/INT7
Reserve
O
Reserved
26
Vdd_CLD
VCC
（
3.0V
）
S
Power supply for digital power amplifier
27
CLD_OUTP
CLD_OUTP
O
Positive output of digital power amplifier
28
VSS_CLD
GND
S
Power ground for digital power amplifier
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