PIC16F627A Datasheet, PDF (13/168 Pages) Microchip Technology – FLASH-Based 8-Bit CMOS Microcontrollers

PIC16F627A/628A/648A
TABLE 3-2: PIC16F627A/628A/648A PINOUT DESCRIPTION
Name
RA0/AN0
RA1/AN1
RA2/AN2/VREF
RA3/AN3/CMP1
RA4/T0CKI/CMP2
RA5/MCLR/VPP
RA6/OSC2/CLKOUT
RA7/OSC1/CLKIN
RB0/INT
RB1/RX/DT
RB2/TX/CK
RB3/CCP1
Legend: O = Output
— = Not used
TTL = TTL Input
Function
RA0
AN0
RA1
AN1
RA2
AN2
VREF
RA3
AN3
CMP1
RA4
T0CKI
CMP2
RA5
MCLR
VPP
RA6
OSC2
CLKOUT
RA7
OSC1
CLKIN
RB0
INT
RB1
RX
DT
RB2
TX
CK
RB3
CCP1
Input Type Output Type
Description
ST
CMOS Bi-directional I/O port
AN
—
Analog comparator input
ST
CMOS Bi-directional I/O port
AN
—
Analog comparator input
ST
CMOS Bi-directional I/O port
AN
—
Analog comparator input
—
AN
VREF output
ST
CMOS Bi-directional I/O port
AN
—
Analog comparator input
—
CMOS Comparator 1 output
ST
OD
Bi-directional I/O port
ST
—
Timer0 clock input
—
OD
Comparator 2 output
ST
—
Input port
ST
—
ST
—
—
ST
XTAL
ST
TTL
ST
—
—
CMOS
XTAL
CMOS
CMOS
—
—
CMOS
—
Master clear. When configured as MCLR, this
pin is an active low RESET to the device.
Voltage on MCLR/VPP must not exceed VDD
during normal device operation.
Programming voltage input.
Bi-directional I/O port
Oscillator crystal output. Connects to crystal
or resonator in Crystal Oscillator mode.
In RC/INTOSC mode, OSC2 pin can output
CLKOUT, which has 1/4 the frequency of
OSC1
Bi-directional I/O port
Oscillator crystal input
External clock source input. RC biasing pin.
Bi-directional I/O port. Can be software pro-
grammed for internal weak pull-up.
External interrupt.
TTL
CMOS Bi-directional I/O port. Can be software pro-
grammed for internal weak pull-up.
ST
—
USART receive pin
ST
CMOS Synchronous data I/O.
TTL
CMOS Bi-directional I/O port. Can be software pro-
grammed for internal weak pull-up.
—
CMOS USART transmit pin
ST
CMOS Synchronous clock I/O.
TTL
CMOS Bi-directional I/O port. Can be software pro-
grammed for internal weak pull-up.
ST
CMOS Capture/Compare/PWM I/O
CMOS = CMOS Output
I
= Input
OD = Open Drain Output
P = Power
ST = Schmitt Trigger Input
AN = Analog
 2002 Microchip Technology Inc.
Preliminary
DS40044A-page 11