Cpu Pins - HYT TC-508 Service Manual

CPU Pins

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