PIC16F819 Microchip Technology Inc., PIC16F819 Datasheet - Page 9

• Manufacturer Part Number: PIC16F819
• Description: 18/20-pin Enhanced Flash Microcontrollers With Nanowatt Technology
• Manufacturer: Microchip Technology Inc.

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