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TC-610P Service Manual
21
CPU Pins
1. TC-610P (HDC1200 Ver.) CPU Pins
Pin No.
Port
Pin Name
I/O
Function
1
AVcc
Vcc
Power supply pin for A/D; connected to
power supply.
2
AVR
Vcc
A/D reference input pin; connected to
power supply.
3
PE3/INT13
PTT
I
PTT key (connected with external pull-up
resistor) (valid at low level).
4
PE2/INT12
SK1
I
SK1 pin (connected with external pull-up
resistor) (valid at low level)
5
PE1/INT11
EXT-PTT
I
Earpiece PTT input pin (connected with
pull-down resistor) (valid at high level)
6
PE0/INT10
SK2
I
SK2 pin (connected with external pull-up
resistor) (valid at low level)
7
P83
ENC3
I
Channel
Selector
Knob
input
pin
(connected with pull-up resistor)
8
P82
ENC2
I
9
P81
ENC1
I
10
P80
ENC0
I
11
P71/TI0
T/R
O
Tx/Rx switch pin H (R) / L (T)
12
P70/TO0
Reserved
13
MOD
Download
I
An operating mode designation pin; when
downloading, this pin is connected with
VCC and external 47K resistor for ground
Vss; in other situations, it is connected
only with external 47K resistor for ground
Vss.
14
X0
OSC0
For 7.3728MHz main crystal oscillator
15
X1
OSC1
16
Vss
GND
Power
supply
(Ground)
pin;
when
downloading, this pin is connected to
Ground.
17
Vcc
VCC
(
5V
)
5V power supply pin for MCU; when
downloading, this pin is connected with
VCC.
18
PG0
C (this pin is not for I/O
use)
5V MCU; this pin is not for I/O use, and it
must be connected with capacitor for
ground Vss.