
1997 Microchip Technology Inc.
DS30234D-page 15
PIC16C6X
TABLE 3-2:
PIC16C62/62A/R62/63/R63/66 PINOUT DESCRIPTION
Pin Name
Pin#
Pin Type
Buffer
Type
Description
OSC1/CLKIN
9
I
ST/CMOS(3)
Oscillator crystal input/external clock source input.
OSC2/CLKOUT
10
O
—
Oscillator crystal output. Connects to crystal or resonator in crys-
tal oscillator mode. In RC mode, the pin outputs CLKOUT which
has 1/4 the frequency of OSC1, and denotes the instruction cycle
rate.
MCLR/VPP
1
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
2
I/O
TTL
RA1
3
I/O
TTL
RA2
4
I/O
TTL
RA3
5
I/O
TTL
RA4/T0CKI
6
I/O
ST
RA4 can also be the clock input to the Timer0 timer/counter.
Output is open drain type.
RA5/SS
7
I/O
TTL
RA5 can also be the slave select for the synchronous serial
port.
PORTB is a bi-directional I/O port. PORTB can be software pro-
grammed for internal weak pull-up on all inputs.
RB0/INT
21
I/O
TTL/ST(4)
RB0 can also be the external interrupt pin.
RB1
22
I/O
TTL
RB2
23
I/O
TTL
RB3
24
I/O
TTL
RB4
25
I/O
TTL
Interrupt on change pin.
RB5
26
I/O
TTL
Interrupt on change pin.
RB6
27
I/O
TTL/ST(5)
Interrupt on change pin. Serial programming clock.
RB7
28
I/O
TTL/ST(5)
Interrupt on change pin. Serial programming data.
PORTC is a bi-directional I/O port.
RC0/T1OSO(1)/T1CKI
11
I/O
ST
RC0 can also be the Timer1 oscillator output(1) or Timer1
clock input.
RC1/T1OSI(1)/CCP2(2)
12
I/O
ST
RC1 can also be the Timer1 oscillator input(1) or Capture2
input/Compare2 output/PWM2 output(2).
RC2/CCP1
13
I/O
ST
RC2 can also be the Capture1 input/Compare1 out-
put/PWM1 output.
RC3/SCK/SCL
14
I/O
ST
RC3 can also be the synchronous serial clock input/output
for both SPI and I2C modes.
RC4/SDI/SDA
15
I/O
ST
RC4 can also be the SPI Data In (SPI mode) or
data I/O (I2C mode).
RC5/SDO
16
I/O
ST
RC5 can also be the SPI Data Out (SPI mode).
RC6/TX/CK(2)
17
I/O
ST
RC6 can also be the USART Asynchronous Transmit(2) or
Synchronous Clock(2).
RC7/RX/DT(2)
18
I/O
ST
RC7 can also be the USART Asynchronous Receive(2) or
Synchronous Data(2).
VSS
8,19
P
—
Ground reference for logic and I/O pins.
VDD
20
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:
Pin functions T1OSO and T1OSI are reversed on the PIC16C62.
2:
The USART and CCP2 are not available on the PIC16C62/62A/R62.
3:
This buffer is a Schmitt Trigger input when congured in RC oscillator mode and a CMOS input otherwise.
4:
This buffer is a Schmitt Trigger input when congured as the external interrupt.
5:
This buffer is a Schmitt Trigger input when used in serial programming mode.