Cpu Pins - HYT POWER446 Service Manual

CPU Pins

Pin No. Port Name
1 AVcc
2 AVR
3 PE3/INT13
4 PE2/INT12
5 PE1/INT11
6 PE0/INT10
7 P83
8 P82
9 P81
10 P80
11 P71/TI0
12 P70/TO0
13 MOD
14 X0
15 X1
16 Vss
Pin Name I/O
I
Vcc
I
Vcc
PTT I
A_KEY I
EXT-PTT I
B_KEY I
ENC3 I
ENC2 I
ENC1 I
ENC0 I
T/R O
Reserve O
Programming I
OSC0
O
OSC1
I
GND /
POWER446 Service Manual
Description
A/D power supply pin; to connect with the
power supply.
A/D reference input pin; to connect with the power
supply.
PTT key input pin (connected with external
pull-up resistor) (valid at low level) .
SK1 input pin (connected with external pull-up
resistor) (valid at low level)
Earpiece PTT input pin (connected with
external pull-down resistor) (valid at high level)
SK2 input pin (connected with external pull-up
resistor) (valid at low level)
Channel Selector knob input pin (connected
with external pull-up resistor)
For TX/RX switch control: High (RX)/Low(TX)
Reserved
During programming, this pin is used to
connect with VCC and a
connected between the pin and the grounded
Vss; otherwise, only a 47K resistor is
connected between the pin and the grounded
Vss.
For 7.3728MHz main crystal oscillator
For grounding (During programming, this pin is
15
47K resistor is