PIC18F2331 Datasheet, PDF (110/396 Pages) Microchip Technology – 28/40/44-Pin Enhanced Flash Microcontrollers with nanoWatt Technology, High Performance PWM and A/D

PIC18F2331/2431/4331/4431
FIGURE 10-2:
BLOCK DIAGRAM OF RA0
Data
Bus
WR LATA
or
PORTA
WR TRISA
RD LATA
D
Q
CK Q
Data Latch
D
Q
CK Q
TRIS Latch
VDD
P
N
I/O Pin
VSS
Analog
Input
Mode
RD TRISA
Q
D
TTL
Input
Buffer
EN
RD PORTA
To A/D Converter
FIGURE 10-3:
BLOCK DIAGRAM OF RA1
Data Bus
WR LATA
or
PORTA
WR TRISA
RD LATA
D
Q
CK Q
Data Latch
D
Q
CK Q
TRIS Latch
VDD
P
RA1
N
VSS
Analog
Input
Mode
RD TRISA
RD PORTA
TTL
Q
D
EN
To A/D Converter
FIGURE 10-4:
BLOCK DIAGRAM OF RA3:RA2 PINS
Data Bus
WR LATA
or
PORTA
WR TRISA
RD LATA
D
Q
CK Q
Data Latch
D
Q
CK Q
TRIS Latch
RD TRISA
VDD
P
N
VSS
Analog
Input
Mode
TTL
RD PORTA
Q
D
EN
To A/D Converter
To CAP1/INDX or CAP2/QEA
I/O Pin
Schmitt
Trigger
Input
Buffer
DS39616B-page 108
Preliminary
 2003 Microchip Technology Inc.