Intel MCS48 User Manual page 157

8048/8648/8748/8035
WAVEFORMS
Instruction
Fetch
From
External
Program
Memory
Read
From
External
Data
Memory
J
BUS FLOATING
l AFc|-»
kc
"
Tca
J
L
\£
jf
FLOATING
\f
yf
FLOATING
Y
INSTRUCTION
J
(
CC
»-|
ICA
p
'afc
—
*"'
H
—
" r*—
*DR
!
:
FLOATING
i
BUS
FLOATING
^ADDRESSX
y
)^y
Write to External Data
Memory
J
h
L
i
—
!-•
(
-^
—
"wo
BUS
FLOATINgYaDDRESsYfLOATINgY
DATA
Y
FLOATING
Input
and Output Waveforms
for A.C.
Tests
X
L2A_
A.C.
CHARACTERISTICS
T
A
= o°c
to 70°c,
v
cc
=
v
DD
=
+5V ±10%
,
v
ss
=
ov
Symbol
Parameter
8048
8648
8748/8035/8035L
8748-8*
8035-8
Unit
Conditions (Note
1)
Min.
Max.
Min.
Max.
t|_L
ALE
Pulse
Width 400
600
ns
tAL
Address Setup
to
ALE
120
150
ns
tLA
Address Hold
from
ALE
80 80
ns
t CC
Control Pulse
Width (PSEN,
RD.WR)
700
1500
ns
tow
Data Setup
before
WR
500 640
ns
*WD
Data Hold After
WR
120 120
ns
C
L
=
20pF
tCY
Cycle
Time
2.5 15.0 4.17 15.0
Ms
6MHzXTAL
=
2.5
(3.6
MHz XTAL
for
-8)
*DR
Data Hold 200 200
ns
l
RD
PSEN,
RD
to Data
In
500
750
ns
t
A\N
Address Setup
to
WR
230 260
ns
*AD
Address Setup
to Data
In
950 1450
ns
*AFC
Address
Float to
RD,
PSEN
ns
tcA
Control Pulse
to
ALE
10 20 ns
Note
1:
Control outputs:
C|_
= 80pF
tQY =
2
-
5
MS for
standard
parts 'Vqc
and V
DD
,or
8748-8 and 8035-8
are
± 5%.
BUS
Outputs:
C|_=150pF
=
4.17
M s for
-8
parts
6-5