By: Masud-ul-Hasan
20
External Program Memory
8051
PORT2
ALE
PORT0
PSEN
ADDRESS
LATCH
ROM(S)
ADDRESS
INPUTS
DATA
OUTPUTS
OE
A15 - A8
A7 - A0
D7 - D0
AD7 - AD0
EA
•
64K byte address space.
•
Enabled by PSEN signal.