8051AH Datasheet, PDF (11/21 Pages) Intel Corporation – MCS51 8-BIT CONTROL-ORIENTED MICROCONTROLLERS

MCS@51 CONTROLLER
EXTERNAL PROGRAM MEMORY READ CYCLE
ALE
PSEN
PORT O
w--- TLHLL _
\,
TLLPL- ~
/
TPLPH
-TAVLL+
+ TLLIV
/
TLLAX
PORT 2
x¹
AO -A15
x
\
A8 -A15
272318-5
EXTERNAL DATA MEMORY READ CYCLE
ALE
PSEN
m
PORTO
PORT2
Y
+TLHLL+
‘LLOv ~
—
TLLWL
TRLRH –—
+ TAVLL +
_TLLAX
b
—TRLDV4
i‘
TRHOX+
AO-A7 FROM RI OR OPL
OATA IN
.
.
TAVOV
b
xr
P2.O-P2.7 OR A8-A15 FROMDPH
\
/
TWHLH
x
A8-A15 FROMPCH
272318-6
EXTERNAL DATA MEMORY WRITE CYCLE
ALE
m
WT
PORTO
PORT2
\,
TLHLL—
‘TLLwL~TwLwH
1 7t=- TAVLL
+TLLAX
TQVWX ^k
II
I
AO-A7
FROMRIOR OPL M
TQVWH
OATAOUT
x^I
P2.O-P2.7 OR A8-A15 FROMOPH
\
/
TWHLH
/
*
1‘
TWHQX
:r
xx1
AO-A7 FROMFCL
x
A8-A15 FROMPCH
272318-7
11