16F84A Microchip Technology, 16F84A Datasheet - Page 4

• Manufacturer Part Number: 16F84A
• Description: 18-pin Enhanced Flash/EEPROM 8-Bit Microcontroller
• Manufacturer: Microchip Technology

PIC16F84A
TABLE 1-1
DS35007A-page 4
OSC1/CLKIN
OSC2/CLKOUT
MCLR
RA0
RA1
RA2
RA3
RA4/T0CKI
RB0/INT
RB1
RB2
RB3
RB4
RB5
RB6
RB7
V
V
Legend: I= input
Note 1: This buffer is a Schmitt Trigger input when configured as the external interrupt.
SS
DD
Pin Name
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.
DIP
No.
16
15
17
18
10
11
12
13
14
PIC16F84A PINOUT DESCRIPTION
4
1
2
3
6
7
8
9
5
O = output
— = Not used
SOIC
No.
16
15
17
18
10
11
12
13
14
4
1
2
3
6
7
8
9
5
SSOP
15,16
No.
5,6
18
19
19
20
10
11
12
13
14
4
1
2
3
7
8
9
I/O/P
Type
I/O = Input/Output
TTL = TTL input
I/O
I/O
I/O
I/O
I/O
I/O
I/O
I/O
I/O
I/O
I/O
I/O
I/O
I/P
O
P
P
I
Preliminary
ST/CMOS
TTL/ST
TTL/ST
TTL/ST
Buffer
Type
TTL
TTL
TTL
TTL
TTL
TTL
TTL
TTL
TTL
ST
ST
—
—
—
( 1)
(2)
(2)
(3)
Description
Oscillator crystal input/external clock source input.
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.
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.
PORTB is a bi-directional I/O port. PORTB can be software
programmed for internal weak pull-up on all inputs.
Ground reference for logic and I/O pins.
Positive supply for logic and I/O pins.
P = power
ST = Schmitt Trigger input
Can also be selected to be the clock input to the TMR0
timer/counter. Output is open drain type.
RB0/INT can also be selected as an external interrupt
pin.
Interrupt on change pin.
Interrupt on change pin.
Interrupt on change pin. Serial programming clock.
Interrupt on change pin. Serial programming data.
1998 Microchip Technology Inc.