PIC18F2331 Datasheet, PDF (111/396 Pages) Microchip Technology – 28/40/44-Pin Enhanced Flash Microcontrollers with nanoWatt Technology, High Performance PWM and A/D

PIC18F2331/2431/4331/4431
FIGURE 10-5:
BLOCK DIAGRAM OF RA4
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
Q
D
TTL
Input
Buffer
EN
RD PORTA
To A/D Converter
To CAP3/QEB
Note 1: Open-drain usually available on RA4 has been removed for this device.
RA4⁽¹⁾
Schmitt
Trigger
Input
Buffer
 2003 Microchip Technology Inc.
Preliminary
DS39616B-page 109