PIC16F7X7
TABLE 1-3:
Pin Name
OSC1/CLKI/RA7
OSC1
PIC16F747 AND PIC16F777 PINOUT DESCRIPTION
PDIP
Pin #
13
QFN
Pin #
32
TQFP
Pin #
30
I
I/O/P
Type
Buffer
Type
Description
CLKI
I
RA7
OSC2/CLKO/RA6
OSC2
CLKO
14
33
31
I/O
O
O
ST/CMOS
(4)
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).
ST
Bidirectional I/O pin.
—
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.
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.
RA6
MCLR/V
PP
/RE3
MCLR
V
PP
RE3
RA0/AN0
RA0
AN0
RA1/AN1
RA1
AN1
RA2/AN2/V
REF
-/CV
REF
RA2
AN2
V
REF
-
CV
REF
RA3/AN3/V
REF
+
RA3
AN3
V
REF
+
RA4/T0CKI/C1OUT
RA4
T0CKI
C1OUT
RA5/AN4/LVDIN/SS/C2OUT
RA5
AN4
LVDIN
SS
C2OUT
Legend:
Note 1:
2:
3:
4:
5:
2
19
19
1
18
18
I/O
I
P
I
ST
ST
ST
TTL
I/O
I
3
20
20
I/O
I
4
21
21
I/O
I
I
I
5
22
22
I/O
I
I
6
23
23
I/O
I
O
7
24
24
I/O
I
I
I
I
TTL
ST
TTL
TTL
TTL
Digital I/O.
Analog input 0.
Digital I/O.
Analog input 1.
Digital I/O.
Analog input 2.
A/D reference voltage input (low).
Comparator voltage reference output.
Digital I/O.
Analog input 3.
A/D reference voltage input (high).
Digital I/O – Open-drain when configured as output.
Timer0 external clock input.
Comparator 1 output.
Digital I/O.
Analog input 4.
Low-Voltage Detect input.
SPI™ slave select input.
Comparator 2 output.
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 an external interrupt.
This buffer is a Schmitt Trigger input when used in Serial Programming mode.
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).
This buffer is a Schmitt Trigger input when configured in RC Oscillator mode and a CMOS input otherwise.
Pin location of CCP2 is determined by the CCPMX bit in Configuration Word Register 1.
2004 Microchip Technology Inc.
DS30498C-page 11
MICROCHIP [ MICROCHIP TECHNOLOGY ]
