PIC16F84A_13 Datasheet, PDF (4/90 Pages) Microchip Technology – 18-pin Enhanced FLASH/EEPROM 8-Bit Microcontroller

PIC16F84A
TABLE 1-1: PIC16F84A PINOUT DESCRIPTION
Pin Name
PDIP SOIC SSOP I/O/P
No. No. No. Type
Buffer
Type
Description
OSC1/CLKIN 16 16
18
OSC2/CLKOUT 15 15
19
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
4
4
4
I/P
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.
RA0
17 17
19
I/O
TTL
RA1
18 18
20
I/O
TTL
RA2
1
1
1
I/O
TTL
RA3
2
2
2
I/O
TTL
RA4/T0CKI
3
3
3
I/O
ST
Can also be selected to be the clock input to the
TMR0 timer/counter. Output is open drain type.
RB0/INT
6
6
PORTB is a bi-directional I/O port. PORTB can be
software programmed for internal weak pull-up on
all inputs.
7
I/O TTL/ST⁽¹⁾
RB0/INT can also be selected as an external
interrupt pin.
RB1
7
7
8
I/O
TTL
RB2
8
8
9
I/O
TTL
RB3
9
9
10
I/O
TTL
RB4
10 10
11
I/O
TTL
Interrupt-on-change pin.
RB5
11 11
12
I/O
TTL
Interrupt-on-change pin.
RB6
12 12
13
I/O TTL/ST⁽²⁾
Interrupt-on-change pin.
Serial programming clock.
RB7
13 13
14
I/O TTL/ST⁽²⁾
Interrupt-on-change pin.
Serial programming data.
VSS
5
5
5,6
P
—
Ground reference for logic and I/O pins.
VDD
14 14 15,16 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.
DS35007C-page 4
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