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| PIC18FXX20 Datasheet, PDF (125/366 Pages) Microchip Technology – 64/80-Pin High Performance 1 Mbit Enhanced FLASH Microcontrollers with A/D | |||
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PIC18FXX20
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
 2003 Microchip Technology Inc.
Advance Information
DS39609A-page 123
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