HYT TC-618, Руководство по обслуживанию

Страница: 20 / 110

TC-618/626 Service Manual
19
CPU Pins
Pin No. Port Name TC-618 TC-626 I/O Function
1 AVcc Vcc Vcc I
For input from the A/D power supply;
connected with the power supply.
2 AVR Vcc Vcc I
For input of A/D reference signal;
connected with the power supply.
3 PE3/INT13 PTT PTT I
For input from PTT (connected with
pull-up resistor) (valid at low level).
4 PE2/INT12 A_KEY A_KEY I
For input from SK1 (connected with
pull-up resistor) (valid at low level).
5 PE1/INT11 EXT-PTT EXT-PTT I
For input from earpiece PTT
(connected with pull-down resistor)
(valid at high level).
6 PE0/INT10 B_KEY B_KEY I
For SK2 input (connected with pull-up
resistor) (valid at low level).
7 P83 ENC3 ENC3 I
For input from the Channel Selector
Knob (connected with pull-up resistor).
8 P82 ENC2 ENC2 I
For input from the Channel Selector
Knob (connected with pull-up resistor).
9 P81 ENC1 ENC1 I
For input from the Channel Selector
Knob (connected with pull-up resistor).
10 P80 ENC0 ENC0 I
For input from the Channel Selector
Knob (connected with pull-up resistor).
11 P71/TI0 T/R T/R O
To control Tx/Rx switch: H(Rx)/L(Tx).
12 P70/TO0 Reserve Reserve O
Reserved.
13 MOD For
programmi
ng
For
programmi
ng
I
For operating mode indication; during
programming, it is connected with VCC
and a 47K resistor is connected
between the pin and the grounded Vss;
during non-programming period, only a
47K resistor is connected between the
pin and the grounded Vss.
14 X0 OSC0 OSC0 O
15 X1 OSC1 OSC1 I
Pin for the 7.3728MHz main crystal
oscillator.
16 Vss GND GND
GND (connected the GND
programming port during
programming).
17 Vcc VCC VCC I
5V (connected the VCC programming
port during programming).
18 PG0 C C
Not used as I/O; a capacitor is
connected between the pin and the
grounded Vss.
19 PG2/X1A OSC32K OSC32K O
Pin for the auxiliary crystal (reserved)
20 PG1/X0A OSC32K OSC32K O
Pin for the auxiliary crystal (reserved)
21 /RST RESET RESET I
Reset (connected the RSTX
programming port during
programming).
22 P00/INT00 Reserve Reserve O
Reserved.
23 P01/INT01 Reserve Reserve O
Reserved.
24 P02/INT02 Reserve Reserve O
Reserved.
25 P03/INT03 Reserve Reserve O
Reserved.