PIC16F819T-E Datasheet, PDF (42/176 Pages) Microchip Technology – 18/20-Pin Enhanced Flash Microcontrollers with nanoWatt Technology

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