By: Masud-ul-Hasan
19
External Bus Expansion
8051
•
PORT 2
•
•
PORT 0
•
•
ALE
•
•
P3.7
•
•
P3.6
•
•
PSEN
A15 - A8:
High byte of address
AD7 - AD0:
Data and low byte
address
ALE:
Address latch enable
RD:
Read strobe
WR:
Write strobe
PSEN:
Program store enable
EA