PIC18F6520-I Datasheet, PDF (114/380 Pages) Micrel Semiconductor – 64/80-Pin High-Performance, 256 Kbit to 1 Mbit Enhanced Flash Microcontrollers with A/D

PIC18F6520/8520/6620/8620/6720/8720
FIGURE 10-10: PORTD BLOCK DIAGRAM IN SYSTEM BUS MODE
RD PORTD
QD
ENEN
RD LATD
Data Bus
WR LATD
or PORTD
WR TRISD
DQ
CK
Data Latch
DQ
CK
TRIS Latch
Port ₀
Data ₁
RD TRISD
System Bus
Control
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
DS39609B-page 112
 2004 Microchip Technology Inc.