PIC18F6520-I Datasheet, PDF (125/380 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 10-19: RH3:RH0 PINS BLOCK DIAGRAM IN SYSTEM BUS MODE
RD PORTH
Q
D
ENEN
RD LATD
Data Bus
WR LATH
or
PORTH
D
Q
CK
Data Latch
Port ₀
Data ₁
WR TRISH
DQ
CK
TRIS Latch
System Bus
Control
RD TRISH
External Enable
Address Out
Drive System
To Instruction Register
Instruction Read
Note 1: I/O pins have diode protection to VDD and VSS.
I/O pin⁽¹⁾
TTL
Input
Buffer
 2004 Microchip Technology Inc.
DS39609B-page 123