PIC18FXX8 Datasheet, PDF (96/402 Pages) Microchip Technology – 28/40-Pin High-Performance, Enhanced Flash Microcontrollers with CAN Module

PIC18FXX8
FIGURE 9-1:
RA3:RA0 AND RA5 PINS
BLOCK DIAGRAM
FIGURE 9-2:
RA4/T0CKI PIN BLOCK
DIAGRAM
RD LATA
Data Bus
WR LATA or
WR PORTA
D
Q
CK Q
Data Latch
D
Q
WR TRISA
Analog
Input Mode
CK Q
TRIS Latch
VDD
P
N
I/O pin⁽¹⁾
VSS
RD TRISA
Q
D
TTL
Input
Buffer
EN
RD PORTA
SS Input (RA5 only)
To A/D Converter and LVD Modules
Note 1: I/O pins have diode protection to VDD and VSS.
RD LATA
Data Bus
WR LATA or
WR PORTA
D
Q
CK Q
Data Latch
D
Q
WR TRISA
CK Q
TRIS Latch
RD TRISA
N
VSS
TTL
Input
Buffer
RD PORTA
TMR0 Clock Input
Q
D
EN
Note 1: I/O pin has diode protection to VSS only.
I/O pin⁽¹⁾
Schmitt
Trigger
Input
Buffer
FIGURE 9-3:
OSC2/CLKO/RA6 PIN BLOCK DIAGRAM
(FOSC = 101, 111)
CLKO (FOSC/4)
1
Data Latch
Data Bus
D
Q
0
From OSC1
WR PORTA
CK Q
TRIS Latch
D
Q
WR TRISA
(FOSC = 100,
101, 110, 111)
CK Q
Oscillator
Circuit
VDD
P
N
VSS
RD TRISA
RD PORTA
(FOSC = 110, 100)
DQata LatcDh
EN
Schmitt
Trigger
Input Buffer
Note 1: CLKO is 1/4 of FOSC.
2: I/O pin has diode protection to VDD and VSS.
OSC2/CLKO
RA6 pin⁽²⁾
DS41159D-page 94
 2004 Microchip Technology Inc.