PIC16F819T-E Datasheet, PDF (9/176 Pages) Microchip Technology – 18/20-Pin Enhanced Flash Microcontrollers with nanoWatt Technology

PIC16F818/819
TABLE 1-2: PIC16F818/819 PINOUT DESCRIPTIONS
Pin Name
PDIP/
SOIC
Pin#
SSOP
Pin#
QFN
Pin#
I/O/P
Type
Buffer
Type
Description
PORTA is a bidirectional I/O port.
RA0/AN0
RA0
AN0
17 19 23
I/O
I
TTL
Analog
Bidirectional I/O pin.
Analog input channel 0.
RA1/AN1
RA1
AN1
18 20 24
I/O
I
TTL
Analog
Bidirectional I/O pin.
Analog input channel 1.
RA2/AN2/VREF-
RA2
AN2
VREF-
1
1 26
I/O
TTL
I
Analog
I
Analog
Bidirectional I/O pin.
Analog input channel 2.
A/D reference voltage (low) input.
RA3/AN3/VREF+
RA3
AN3
VREF+
2
2 27
I/O
TTL
I
Analog
I
Analog
Bidirectional I/O pin.
Analog input channel 3.
A/D reference voltage (high) input.
RA4/AN4/T0CKI
RA4
AN4
T0CKI
3
3 28
I/O
ST
I
Analog
I
ST
Bidirectional I/O pin.
Analog input channel 4.
Clock input to the TMR0 timer/counter.
RA5/MCLR/VPP
RA5
MCLR
VPP
4
4
1
I
ST
I
ST
P
–
Input pin.
Master Clear (Reset). Input/programming
voltage input. This pin is an active-low Reset
to the device.
Programming threshold voltage.
RA6/OSC2/CLKO
RA6
OSC2
CLKO
15 17 20
I/O
ST
O
–
O
–
Bidirectional I/O pin.
Oscillator crystal output. Connects to crystal or
resonator in Crystal Oscillator mode.
In RC mode, this pin outputs CLKO signal
which has 1/4 the frequency of OSC1 and
denotes the instruction cycle rate.
RA7/OSC1/CLKI
RA7
OSC1
CLKI
16 18 21
I/O
ST
I ST/CMOS⁽³⁾
Bidirectional I/O pin.
Oscillator crystal input.
I
–
External clock source input.
Legend: I = Input
– = Not used
O = Output
TTL = TTL Input
I/O = Input/Output
ST = Schmitt Trigger Input
P = Power
Note 1: This buffer is a Schmitt Trigger input when configured as the 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 in RC Oscillator mode and a CMOS input otherwise.
 2004 Microchip Technology Inc.
DS39598E-page 7