PIC16F819 Microchip Technology Inc., PIC16F819 Datasheet - Page 42

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

PIC16F818/819
FIGURE 5-1:
FIGURE 5-2:
DS39598E-page 40
Data
Bus
WR
PORTA
WR
TRISA
RD PORTA
To A/D Module V
To A/D Module Channel Input
Bus
WR
PORTA
WR
TRISA
RD PORTA
To A/D Module Channel Input
Data
TRIS Latch
TRIS Latch
D
Data Latch
D
D
Data Latch
D
CK
CK
CK
CK
RD TRISA
RD TRISA
REF
Q
Q
Q
Q
Q
Q
Q
Q
+ Input
BLOCK DIAGRAM OF
RA0/AN0:RA1/AN1 PINS
BLOCK DIAGRAM OF
RA3/AN3/V
Input Mode
Input Mode
Q
Q
Analog
Analog
Input Buffer
Input Buffer
EN
EN
REF
V
V
V
V
P
N
P
N
TTL
D
D
TTL
DD
DD
SS
SS
+ PIN
V
V
V
V
DD
DD
SS
SS
I/O pin
I/O pin
FIGURE 5-3:
FIGURE 5-4:
Data
Bus
WR
PORTA
WR
TRISA
RD PORTA
TMR0 Clock Input
To A/D Module Channel Input
Data
Bus
WR
PORTA
WR
TRISA
RD PORTA
To A/D Module V
To A/D Module Channel Input
TRIS Latch
TRIS Latch
D
Data Latch
D
D
Data Latch
D
CK
CK
CK
CK
RD TRISA
RD TRISA
REF
Q
Q
Q
Q
Q
Q
Q
Q
- Input
BLOCK DIAGRAM OF
RA2/AN2/V
BLOCK DIAGRAM OF
RA4/AN4/T0CKI PIN
 2004 Microchip Technology Inc.
Input Mode
Input Mode
Schmitt Trigger
Q
Q
Analog
Analog
Input Buffer
Input Buffer
REF
EN
EN
V
V
V
V
P
N
P
N
D
TTL
D
DD
DD
SS
SS
- PIN
V
V
V
V
DD
DD
SS
SS
I/O pin
I/O pin