PIC16F72-E Datasheet, PDF (8/136 Pages) Microchip Technology – 28-Pin, 8-Bit CMOS FLASH Microcontoller with A/D Converter

PIC16F72
TABLE 1-1: PIC16F72 PINOUT DESCRIPTION
Pin Name
PDIP,
SOIC,
SSOP
Pin#
MLF
Pin#
I/O/P
Type
Buffer
Type
Description
OSC1/CLKI
9
6
I
ST/CMOS⁽³⁾ Oscillator crystal input/external clock source input.
OSC2/CLKO
10
7
O
—
Oscillator crystal output. Connects to crystal or resonator in Crystal
Oscillator mode. In RC mode, the OSC2 pin outputs CLKO, which has
1/4 the frequency of OSC1, and denotes the instruction cycle rate.
MCLR/VPP
1
26
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/AN0
2
27
I/O
TTL
RA0 can also be analog input0.
RA1/AN1
3
28
I/O
TTL
RA1 can also be analog input1.
RA2/AN2
4
1
I/O
TTL
RA2 can also be analog input2.
RA3/AN3/VREF
5
2
I/O
TTL
RA3 can also be analog input3 or analog reference voltage.
RA4/T0CKI
6
3
I/O
ST
RA4 can also be the clock input to the Timer0 module. Output is
open drain type.
RA5/AN4/SS
7
4
I/O
TTL
RA5 can also be analog input4 or the slave select for the
synchronous serial port.
RB0/INT
PORTB is a bi-directional I/O port. PORTB can be software
programmed for internal weak pull-up on all inputs.
21
18
I/O
TTL/ST⁽¹⁾
RB0 can also be the external interrupt pin.
RB1
22
19
I/O
TTL
RB2
23
20
I/O
TTL
RB3
24
21
I/O
TTL
RB4
25
22
I/O
TTL
Interrupt-on-change pin.
RB5
RB6/PGC
RB7/PGD
26
23
I/O
TTL
27
24
I/O
TTL/ST⁽²⁾
28
25
I/O
TTL/ST⁽²⁾
Interrupt-on-change pin.
Interrupt-on-change pin. Serial programming clock.
Interrupt-on-change pin. Serial programming data.
PORTC is a bi-directional I/O port.
RC0/T1OSO/
11
8
I/O
ST
T1CKI
RC0 can also be the Timer1 oscillator output or Timer1 clock input.
RC1/T1OSI
12
9
I/O
ST
RC1 can also be the Timer1 oscillator input.
RC2/CCP1
13
10
I/O
ST
RC2 can also be the Capture1 input/Compare1 output/
PWM1 output.
RC3/SCK/SCL
14
11
I/O
ST
RC3 can also be the synchronous serial clock input/output for both
SPI and I²C modes.
RC4/SDI/SDA
15
12
I/O
ST
RC4 can also be the SPI Data In (SPI mode) or
Data I/O (I²C mode).
RC5/SDO
16
13
I/O
ST
RC5 can also be the SPI Data Out (SPI mode).
RC6
17
14
I/O
ST
RC7
18
15
I/O
ST
VSS
8, 19 5, 16
P
—
Ground reference for logic and I/O pins.
VDD
20
17
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.
DS39597C-page 6
© 2007 Microchip Technology Inc.