PIC16F8X_13 Datasheet, PDF (9/128 Pages) Microchip Technology – 18-pin Flash/EEPROM 8-Bit Microcontrollers

PIC16F8X
TABLE 3-1 PIC16F8X PINOUT DESCRIPTION
Pin Name
DIP SOIC
No. No.
I/O/P
Type
Buffer
Type
Description
OSC1/CLKIN
OSC2/CLKOUT
16
16
15
15
I
ST/CMOS ⁽³⁾ Oscillator crystal input/external clock source input.
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
RA0
RA1
RA2
RA3
4
4
I/P
17
17
I/O
18
18
I/O
1
1
I/O
2
2
I/O
ST
Master clear (reset) input/programming voltage input. This pin is an
active low reset to the device.
PORTA is a bi-directional I/O port.
TTL
TTL
TTL
TTL
RA4/T0CKI
3
3
I/O
ST
Can also be selected to be the clock input to the TMR0 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.
RB0/INT
6
6
I/O
TTL/ST ⁽¹⁾
RB0/INT can also be selected as an external interrupt pin.
RB1
7
7
I/O
TTL
RB2
8
8
I/O
TTL
RB3
9
9
I/O
TTL
RB4
10
10
I/O
TTL
Interrupt on change pin.
RB5
RB6
RB7
11
11
12
12
13
13
I/O
TTL
I/O
TTL/ST ⁽²⁾
I/O
TTL/ST ⁽²⁾
Interrupt on change pin.
Interrupt on change pin. Serial programming clock.
Interrupt on change pin. Serial programming data.
VSS
5
5
P
—
Ground reference for logic and I/O pins.
VDD
14
14
P
—
Positive supply for logic and I/O pins.
Legend:
Note 1:
2:
3:
I= input O = output
I/O = Input/Output
P = power
— = Not used
TTL = TTL input
ST = Schmitt Trigger input
This buffer is a Schmitt Trigger input when configured as the external interrupt.
This buffer is a Schmitt Trigger input when used in serial programming mode.
This buffer is a Schmitt Trigger input when configured in RC oscillator mode and a CMOS input otherwise.
 1996-2013 Microchip Technology Inc.
DS30430D-page 9