PIC16C63A/65B/73B/74B
DS30605C-page 12
2000 Microchip Technology Inc.
TABLE 3-2:
PIC16C65B/74B PINOUT DESCRIPTION
Pin Name
DIP
Pin#
PLCC
Pin#
TQFP
MQFP
Pin#
I/O/P
Type
Buffer
Type
Description
OSC1/CLKIN
13
14
30
I
ST/CMOS(4)
Oscillator crystal input/external clock source input.
OSC2/CLKOUT
14
15
31
O
Oscillator crystal output. Connects to crystal or resonator in
crystal oscillator mode. In RC mode, OSC2 pin outputs
CLKOUT which has 1/4 the frequency of OSC1, and
denotes the instruction cycle rate.
MCLR/VPP
1
2
18
I/P
ST
Master clear (RESET) input or programming voltage input.
This pin is an active low RESET to the device.
PORTA is a bi-directional I/O port.
RA0/AN0(5)
2
3
19
I/O
TTL
RA0 can also be analog input 0(5).
RA1/AN1(5)
3
4
20
I/O
TTL
RA1 can also be analog input 1(5).
RA2/AN2(5)
4
5
21
I/O
TTL
RA2 can also be analog input 2(5).
RA3/AN3/VREF(5)
5
6
22
I/O
TTL
RA3 can also be analog input 3 or analog reference
voltage(5).
RA4/T0CKI
6
7
23
I/O
ST
RA4 can also be the clock input to the Timer0 timer/
counter. Output is open drain type.
RA5/SS/AN4(5)
7
8
24
I/O
TTL
RA5 can also be analog input 4(5) or the slave select for
the synchronous serial port.
PORTB is a bi-directional I/O port. PORTB can be software
programmed for internal weak pull-up on all inputs.
RB0/INT
33
36
8
I/O
TTL/ST(1)
RB0 can also be the external interrupt pin.
RB1
34
37
9
I/O
TTL
RB2
35
38
10
I/O
TTL
RB3
36
39
11
I/O
TTL
RB4
37
41
14
I/O
TTL
Interrupt-on-change pin.
RB5
38
42
15
I/O
TTL
Interrupt-on-change pin.
RB6
39
43
16
I/O
TTL/ST(2)
Interrupt-on-change pin. Serial programming clock.
RB7
40
44
17
I/O
TTL/ST(2)
Interrupt-on-change pin. Serial programming data.
Legend: I = input
O = output
I/O = input/output
P = power
— = Not used
TTL = TTL input
ST = Schmitt Trigger input
Note
1: This buffer is a Schmitt Trigger input when configured as the external interrupt.
2: This buffer is a Schmitt Trigger input when used in Serial Programming mode.
3: This buffer is a Schmitt Trigger input when configured as general purpose I/O and a TTL input when used in the Parallel
Slave Port mode (for interfacing to a microprocessor bus).
4: This buffer is a Schmitt Trigger input when configured in RC oscillator mode and a CMOS input otherwise.
5: A/D is not available on the PIC16C65B.
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