PIC18FXX20 Datasheet, PDF (114/366 Pages) Microchip Technology – 64/80-Pin High Performance 1 Mbit Enhanced FLASH Microcontrollers with A/D

PIC18FXX20
FIGURE 10-10: PORTD BLOCK DIAGRAM IN SYSTEM BUS MODE
RD PORTD
Q
D
ENEN
RD LATD
Data Bus
WR LATD
or PORTD
WR TRISD
DQ
CK
Data Latch
DQ
CK
TRIS Latch
Port ₀
Data ₁
System Bus
Control
RD TRISD
Bus Enable
Data/TRIS Out
Drive Bus
Instruction Register
Instruction Read
Note 1: I/O pins have protection diodes to VDD and VSS.
I/O pin⁽¹⁾
TTL
Input
Buffer
DS39609A-page 112
Advance Information
 2003 Microchip Technology Inc.