PIC16F627A_05 Datasheet, PDF (13/180 Pages) Microchip Technology – Flash-Based, 8-Bit CMOS Microcontrollers with nanoWatt Technology

PIC16F627A/628A/648A
TABLE 3-2: PIC16F627A/628A/648A PINOUT DESCRIPTION
Name
Function Input Type Output Type
Description
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
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
ST
CMOS Bidirectional I/O port
AN
—
Analog comparator input
ST
CMOS Bidirectional I/O port
AN
—
Analog comparator input
ST
CMOS Bidirectional I/O port
AN
—
Analog comparator input
—
AN
VREF output
ST
CMOS Bidirectional I/O port
AN
—
Analog comparator input
—
CMOS Comparator 1 output
ST
OD
Bidirectional I/O port
ST
—
Timer0 clock input
—
OD
Comparator 2 output
ST
—
Input port
ST
—
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
ST
CMOS Bidirectional I/O port
—
XTAL Oscillator crystal output. Connects to crystal
or resonator in Crystal Oscillator mode.
—
CMOS In RC/INTOSC mode, OSC2 pin can output
CLKOUT, which has 1/4 the frequency of
OSC1.
ST
CMOS Bidirectional I/O port
XTAL
—
Oscillator crystal input
ST
—
External clock source input. RC biasing pin.
TTL
CMOS Bidirectional I/O port. Can be software
programmed for internal weak pull-up.
ST
—
External interrupt
TTL
CMOS Bidirectional I/O port. Can be software
programmed for internal weak pull-up.
ST
—
USART receive pin
ST
CMOS Synchronous data I/O
TTL
CMOS Bidirectional I/O port. Can be software
programmed for internal weak pull-up.
—
CMOS USART transmit pin
ST
CMOS Synchronous clock I/O
TTL
CMOS Bidirectional I/O port. Can be software
programmed 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
© 2005 Microchip Technology Inc.
DS40044D-page 11