PIC16C6X
TABLE 3-1:
PIC16C61 PINOUT DESCRIPTION
DIP
Pin#
SOIC
Pin#
Buffer
Type
Pin Name
Pin Type
Description
(1)
OSC1/CLKIN
16
15
16
15
I
Oscillator crystal input/external clock source input.
ST/CMOS
—
OSC2/CLKOUT
O
Oscillator crystal output. Connects to crystal or resonator in crystal
oscillator mode. In RC mode, the pin outputs CLKOUT which has
1/4 the frequency of OSC1, and denotes the instruction cycle rate.
4
4
I/P
ST
Master clear reset input or programming voltage input.This pin is an
active low reset to the device.
MCLR/VPP
PORTA is a bi-directional I/O port.
RA0
17
18
1
17
18
1
I/O
I/O
I/O
I/O
I/O
TTL
TTL
TTL
TTL
ST
RA1
RA2
RA3
2
2
RA4/T0CKI
3
3
RA4 can also be the clock input to the Timer0 timer/counter.
Output is open drain type.
PORTB is a bi-directional I/O port. PORTB can be software pro-
grammed for internal weak pull-up on all inputs.
(2)
RB0/INT
6
7
6
7
I/O
I/O
I/O
I/O
I/O
I/O
I/O
I/O
P
TTL/ST
TTL
RB0 can also be the external interrupt pin.
RB1
RB2
8
8
TTL
RB3
9
9
TTL
RB4
10
11
12
13
5
10
11
12
13
5
TTL
Interrupt on change pin.
RB5
TTL
Interrupt on change pin.
(3)
RB6
TTL/ST
TTL/ST
—
Interrupt on change pin. Serial programming clock.
Interrupt on change pin. Serial programming data.
Ground reference for logic and I/O pins.
Positive supply for logic and I/O pins.
(3)
RB7
VSS
VDD
14
14
P
—
Legend: I = input
O = output
— = Not used
I/O = input/output
TTL = TTL input
P = power
ST = Schmitt Trigger input
Note 1: This buffer is a Schmitt Trigger input when configured in RC oscillator mode and a CMOS input otherwise.
2: This buffer is a Schmitt Trigger input when configured as the external interrupt.
3: This buffer is a Schmitt Trigger input when used in serial programming mode.
DS30234D-page 14
1997 Microchip Technology Inc.
MICROCHIP [ MICROCHIP ]
