PIC16LF876A-I Datasheet, PDF (8/234 Pages) Microchip Technology – 28/40/44-Pin Enhanced Flash Microcontrollers

PIC16F87XA
TABLE 1-2: PIC16F873A/876A PINOUT DESCRIPTION
Pin Name
PDIP, SOIC, QFN I/O/P
SSOP Pin# Pin# Type
Buffer
Type
Description
OSC1/CLKI
OSC1
CLKI
9
6
ST/CMOS⁽³⁾ Oscillator crystal or external clock input.
I
Oscillator crystal input or external clock source input. ST
buffer when configured in RC mode; otherwise CMOS.
I
External clock source input. Always associated with pin
function OSC1 (see OSC1/CLKI, OSC2/CLKO pins).
OSC2/CLKO
OSC2
CLKO
10
7
—
Oscillator crystal or clock output.
O
Oscillator crystal output. Connects to crystal or resonator
in Crystal Oscillator mode.
O
In RC mode, OSC2 pin outputs CLKO, which has 1/4 the
frequency of OSC1 and denotes the instruction cycle rate.
MCLR/VPP
MCLR
VPP
1
26
ST
Master Clear (input) or programming voltage (output).
I
Master Clear (Reset) input. This pin is an active low Reset
to the device.
P
Programming voltage input.
PORTA is a bidirectional I/O port.
RA0/AN0
RA0
AN0
2
27
TTL
I/O
I
Digital I/O.
Analog input 0.
RA1/AN1
RA1
AN1
3
28
TTL
I/O
I
Digital I/O.
Analog input 1.
RA2/AN2/VREF-/
CVREF
RA2
AN2
VREF-
CVREF
4
1
TTL
I/O
Digital I/O.
I
Analog input 2.
I
A/D reference voltage (Low) input.
O
Comparator VREF output.
RA3/AN3/VREF+
RA3
AN3
VREF+
5
2
TTL
I/O
Digital I/O.
I
Analog input 3.
I
A/D reference voltage (High) input.
RA4/T0CKI/C1OUT
6
RA4
T0CKI
C1OUT
3
ST
I/O
I
O
Digital I/O – Open-drain when configured as output.
Timer0 external clock input.
Comparator 1 output.
RA5/AN4/SS/C2OUT
7
RA5
AN4
SS
C2OUT
4
TTL
I/O
I
I
O
Digital I/O.
Analog input 4.
SPI slave select input.
Comparator 2 output.
Legend:
Note 1:
2:
3:
I = input
O = output
I/O = input/output
P = power
— = Not used TTL = TTL input ST = Schmitt Trigger input
This buffer is a Schmitt Trigger input when configured as the external interrupt.
This buffer is a Schmitt Trigger input when used in Serial Programming mode.
This buffer is a Schmitt Trigger input when configured in RC Oscillator mode and a CMOS input otherwise.
DS39582C-page 8
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