W79E532A Datasheet, PDF (66/78 Pages) Winbond – 8-BIT MICROCONTROLLER

W79E532A/W79L532A
MOVX Characteristics Using Strech Memory Cycle, continued.
PARAMETER
SYMBOL
VARIABLE
CLOCK
MIN.
VARIABLE
CLOCK
MAX.
UNITS STRECH
Data Valid to WR Transition
Data Hold after Write
t_QVWX
t_WHQX
-5
1.0t_CLCL - 5
t_CLCL - 5
2.0t_CLCL - 5
nS
t_MCS = 0
t_MCS>0
nS
t_MCS = 0
t_MCS>0
RD Low to Address Float
t_RLAZ
0.5t_CLCL - 5
nS
RD or WR high to ALE high
t_WHLH
0
1.0t_CLCL - 5
10
1.0t_CLCL + 5
nS
t_MCS = 0
t_MCS>0
Note: t_MCS is a time period related to the Stretch memory cycle selection. The following table shows the time period of t_MCS
for each selection of the Stretch value.
M2
M1
M0
0
0
0
0
0
1
0
1
0
0
1
1
1
0
0
1
0
1
1
1
0
1
1
1
MOVX CYCLES
2 machine cycles
3 machine cycles
4 machine cycles
5 machine cycles
6 machine cycles
7 machine cycles
8 machine cycles
9 machine cycles
T_MCS
0
4 t_CLCL
8 t_CLCL
12 t_CLCL
16 t_CLCL
20 t_CLCL
24 t_CLCL
28 t_CLCL
Explanation of Logics Symbols
In order to maintain compatibility with the original 8051 family, this device specifies the same
parameter for each device, using the same symbols. The explanation of the symbols is as follows.
t
Time
C
Clock
H
Logic level high
A
Address
D
Input Data
L
Logic level low
I
Instruction
P
PSEN
Q
Output Data
R
RD signal
V
Valid
X
No longer a valid state
W
WR signal
Z
Tri-state
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