Datasheet

 2003-2013 Microchip Technology Inc. DS30498D-page 11
PIC16F7X7
TABLE 1-3: PIC16F747 AND PIC16F777 PINOUT DESCRIPTION
Pin Name
PDIP
Pin #
QFN
Pin #
TQFP
Pin #
I/O/P
Type
Buffer
Type
Description
OSC1/CLKI/RA7
OSC1
CLKI
RA7
13 32 30
I
I
I/O
ST/CMOS
(4)
ST
Oscillator crystal or external clock input.
Oscillator crystal input or external clock source input.
ST buffer when configured in RC mode; otherwise
CMOS.
External clock source input. Always associated with
pin function OSC1 (see OSC1/CLKI, OSC2/CLKO
pins).
Bidirectional I/O pin.
OSC2/CLKO/RA6
OSC2
CLKO
RA6
14 33 31
O
O
I/O
—
ST
Oscillator crystal or clock output.
Oscillator crystal output. Connects to crystal or
resonator in Crystal Oscillator mode.
In RC mode, OSC2 pin outputs CLKO which has
1/4 the frequency of OSC1 and denotes the
instruction cycle rate.
Bidirectional I/O pin.
MCLR
/VPP/RE3
MCLR
VPP
RE3
11818
I
P
I
ST
ST
Master Clear (input) or programming voltage (output).
Master Clear (Reset) input. This pin is an
active-low Reset to the device.
Programming voltage input.
Digital input only pin.
PORTA is a bidirectional I/O port.
RA0/AN0
RA0
AN0
21919
I/O
I
TTL
Digital I/O.
Analog input 0.
RA1/AN1
RA1
AN1
32020
I/O
I
TTL
Digital I/O.
Analog input 1.
RA2/AN2/V
REF-/CVREF
RA2
AN2
V
REF-
CV
REF
42121
I/O
I
I
I
TTL
Digital I/O.
Analog input 2.
A/D reference voltage input (low).
Comparator voltage reference output.
RA3/AN3/V
REF+
RA3
AN3
V
REF+
52222
I/O
I
I
TTL
Digital I/O.
Analog input 3.
A/D reference voltage input (high).
RA4/T0CKI/C1OUT
RA4
T0CKI
C1OUT
62323
I/O
I
O
ST
Digital I/O – Open-drain when configured as output.
Timer0 external clock input.
Comparator 1 output.
RA5/AN4/LVDIN/SS
/C2OUT
RA5
AN4
LVDIN
SS
C2OUT
72424
I/O
I
I
I
I
TTL
Digital I/O.
Analog input 4.
Low-Voltage Detect input.
SPI slave select input.
Comparator 2 output.
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 an 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 as a general purpose I/O and a TTL input when used in the Parallel
Slave Port mode (for interfacing to a microprocessor bus).
4: This buffer is a Schmitt Trigger input when configured in RC Oscillator mode and a CMOS input otherwise.
5: Pin location of CCP2 is determined by the CCPMX bit in Configuration Word Register 1.