PIC18FXX20 Datasheet, PDF (106/366 Pages) Microchip Technology – 64/80-Pin High Performance 1 Mbit Enhanced FLASH Microcontrollers with A/D

PIC18FXX20
FIGURE 10-2:
BLOCK DIAGRAM OF
RA3:RA0 AND RA5 PINS
FIGURE 10-3:
BLOCK DIAGRAM OF
RA4/T0CKI PIN
RD LATA
Data
Bus
WR LATA
or
PORTA
WR TRISA
D
Q
CK Q
Data Latch
D
Q
CK Q
TRIS Latch
VDD
P
N
I/O pin⁽¹⁾
VSS
Analog
Input
Mode
RD TRISA
Q
D
TTL
Input
Buffer
EN
RD PORTA
To A/D Converter and LVD Modules
Note 1: I/O pins have protection diodes to VDD and VSS.
RD LATA
Data
Bus
WR LATA
or
PORTA
WR TRISA
RD TRISA
DQ
CK Q
Data Latch
DQ
CK Q
TRIS Latch
N
I/O pin⁽¹⁾
VSS
Schmitt
Trigger
Input
Buffer
RD PORTA
TMR0 Clock Input
Q
D
ENEN
Note 1: I/O pins have protection diodes to VDD and VSS.
FIGURE 10-4:
BLOCK DIAGRAM OF RA6 PIN (WHEN ENABLED AS I/O)
ECRA6 or RCRA6 Enable
Data Bus
RD LATA
WR LATA or PORTA
WR TRISA
D
Q
CK Q
Data Latch
D
Q
CK Q
TRIS Latch
VDD
P
N _{I/O pin}⁽¹⁾
VSS
RD TRISA
ECRA6 or RCRA6 Enable
TTL
Input
Buffer
RD PORTA
Note 1: I/O pins have protection diodes to VDD and VSS.
Q
D
EN
DS39609A-page 104
Advance Information
 2003 Microchip Technology Inc.