PIC16C63A/65B/73B/74B
DS80164A-page 4 2003 Microchip Technology Inc.
TABLE 3-1: PIC16C63A/73B PINOUT DESCRIPTION
Pin Name
DIP
Pin#
SOIC
Pin#
QFN
Pin#
I/O/P
Type
Buffer
Type
Description
OSC1/CLKIN 9 9 6 IST/CMOS
(3)
Oscillator crystal input/external clock source input.
OSC2/CLKOUT 10 10 7 O — Oscillator crystal output. Connects to crystal or resonator in
crystal oscillator mode. In RC mode, the OSC2 pin outputs
CLKOUT which has 1/4 the frequency of OSC1, and denotes
the instruction cycle rate.
MCLR
/VPP 1126 I/P ST Master clear (RESET) input or programming voltage input.
This pin is an active low RESET to the device.
PORTA is a bidirectional I/O port.
RA0/AN0
(4)
2227 I/O TTL RA0 can also be analog input 0
(4)
.
RA1/AN1
(4)
3328 I/O TTL RA1 can also be analog input 1
(4)
.
RA2/AN2
(4)
441 I/O TTL RA2 can also be analog input 2
(4)
.
RA3/AN3/V
REF
(4)
552 I/O TTL RA3 can also be analog input 3 or analog reference
voltage
(4)
.
RA4/T0CKI 6 6 3 I/O ST RA4 can also be the clock input to the Timer0 module.
Output is open drain type.
RA5/SS/AN4
(4)
774 I/O TTL RA5 can also be analog input 4
(4)
or the slave select for
the synchronous serial port.
PORTB is a bidirectional I/O port. PORTB can be software
programmed for internal weak pull-up on all inputs.
RB0/INT 21 21 18 I/O TTL/ST
(1)
RB0 can also be the external interrupt pin.
RB1 22 22 19 I/O TTL
RB2 23 23 20 I/O TTL
RB3 24 24 21 I/O TTL
RB4 25 25 22 I/O TTL Interrupt-on-change pin.
RB5 26 26 23 I/O TTL Interrupt-on-change pin.
RB6 27 27 24 I/O TTL/ST
(2)
Interrupt-on-change pin. Serial programming clock.
RB7 28 28 25 I/O TTL/ST
(2)
Interrupt-on-change pin. Serial programming data.
PORTC is a bidirectional I/O port.
RC0/T1OSO/T1CKI 11 11 8 I/O ST RC0 can also be the Timer1 oscillator output or Timer1
clock input.
RC1/T1OSI/CCP2 12 12 9 I/O ST RC1 can also be the Timer1 oscillator input or Capture2
input/Compare2 output/PWM2 output.
RC2/CCP1 13 13 10 I/O ST RC2 can also be the Capture1 input/Compare1
output/PWM1 output.
RC3/SCK/SCL 14 14 11 I/O ST RC3 can also be the synchronous serial clock input/output
for both SPI and I
2
C modes.
RC4/SDI/SDA 15 15 12 I/O ST RC4 can also be the SPI Data In (SPI mode) or
data I/O (I
2
C mode).
RC5/SDO 16 16 13 I/O ST RC5 can also be the SPI Data Out (SPI mode).
RC6/TX/CK 17 17 14 I/O ST RC6 can also be the USART Asynchronous Transmit
or Synchronous Clock.
RC7/RX/DT 18 18 15 I/O ST RC7 can also be the USART Asynchronous Receive
or Synchronous Data.
V
SS 8, 19 8, 19 16 P — Ground reference for logic and I/O pins.
V
DD 20 20 17 P — Positive supply for logic and I/O pins.
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 in RC Oscillator mode and a CMOS input otherwise.
4: A/D module is not available in the PIC16C63A.
