MT89L86
Advance Information
8
RD
MTA
DTA
OE
LE
MTA
CS
MT89L86
Address
Decode
8
LATCH
LATCH
RES
RST
AD0-AD7
MTA
LE
OE
8051
AD0
MT89L86
Access
AD1
AD2
AD3
AD4
AD5
AD6
AD7
ALE
MT89L86
AD0
AD1
AD2
AD3
AD4
AD5
AD6
AD7
ALE
WR
D
Q
CK PR
LRD
RD
D
Q
WR
CK PR
RD
CS
LWR
D
Q
DTA
CK PR
R
C
RES
DTA
Figure 14 - Interfacing the 3.3V MT89L86 to the 8051 Microcontroller
DTA goes low. When writing to the MT89L86, one
write operation is sufficient. However, when reading
from the MT89L86, two read operations with the
same address are required, with the second being
valid.
22