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PIC16F628A Datasheet(PDF) 37 Page - Microchip Technology

Part # PIC16F628A
Description  FLASH-Based 8-Bit CMOS Microcontrollers
PDF  168 Pages
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Manufacturer  MICROCHIP [Microchip Technology]
Direct Link  http://www.microchip.com
Logo MICROCHIP - Microchip Technology

PIC16F628A Datasheet(HTML) 37 Page - Microchip Technology

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 2002 Microchip Technology Inc.
Preliminary
DS40044A-page 35
PIC16F627A/628A/648A
TABLE 5-1:
PORTA FUNCTIONS
Name
Function
Input
Type
Output
Type
Description
RA0/AN0
RA0
ST
CMOS
Bi-directional I/O port
AN0
AN
—
Analog comparator input
RA1/AN1
RA1
ST
CMOS
Bi-directional I/O port
AN1
AN
—
Analog comparator input
RA2/AN2/V
REF
RA2
ST
CMOS
Bi-directional I/O port
AN2
AN
—
Analog comparator input
V
REF
—AN
V
REF output
RA3/AN3/CMP1
RA3
ST
CMOS
Bi-directional I/O port
AN3
AN
—
Analog comparator input
CMP1
—
CMOS
Comparator 1 output
RA4/T0CKI/CMP2
RA4
ST
OD
Bi-directional I/O port. Output is open drain type.
T0CKI
ST
—
External clock input for TMR0 or comparator output
CMP2
—
OD
Comparator 2 output
RA5/MCLR/V
PP
RA5
ST
—
Input port
MCLR
ST
—
Master clear. When configured as MCLR, this pin is an
active low RESET to the device. Voltage on MCLR/V
PP
must not exceed V
DD during normal device operation.
V
PP
HV
—
Programming voltage input.
RA6/OSC2/CLKOUT
RA6
ST
CMOS
Bi-directional I/O port
OSC2
—
XTAL
Oscillator crystal output. Connects to crystal resonator in
Crystal Oscillator mode.
CLKOUT
—
CMOS
In RC or INTOSC mode. OSC2 pin can output CLKOUT,
which has 1/4 the frequency of OSC1
RA7/OSC1/CLKIN
RA7
ST
CMOS
Bi-directional I/O port
OSC1
XTAL
—
Oscillator crystal input. Connects to crystal resonator in
Crystal Oscillator mode.
CLKIN
ST
—
External clock source input. RC biasing pin.
Legend:
O = Output
CMOS = CMOS Output
P
= Power
— = Not used
I
= Input
ST = Schmitt Trigger Input
TTL = TTL Input
OD
= Open Drain Output
AN = Analog



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