W77IE58 Datasheet, PDF (84/90 Pages) Winbond – 8-BIT MICROCONTROLLER

Preliminary W77IE58
Movx Characteristics Using Strech Memory Cycles, continued
PARAMETER
SYMBOL
VARIABLE
CLOCK
MIN.
VARIABLE
CLOCK
MAX.
UNITS STRECH
ALE Low to RD or WR Low
Port 0 Address to RD or WR
Low
t_LLWL
t_AVWL
0.5 t_CLCL - 5
1.5 t_CLCL - 5
t_CLCL - 5
2.0 t_CLCL - 5
0.5 t_CLCL + 5
1.5 t_CLCL + 5
nS
t_MCS = 0
t_MCS>0
nS
t_MCS = 0
t_MCS>0
Port 2 Address to RD or WR
Low
t_AVWL2
1.5 t_CLCL - 5
2.5 t_CLCL - 5
nS
t_MCS = 0
t_MCS>0
Data Valid to WR Transition
Data Hold after Write
RD Low to Address Float
t_QVWX
t_WHQX
t_RLAZ
-5
1.0 t_CLCL - 5
t_CLCL - 5
2.0 t_CLCL - 5
0.5 t_CLCL - 5
nS
t_MCS = 0
t_MCS>0
nS
t_MCS = 0
t_MCS>0
nS
RD or WR high to ALE high
t_WHLH
0
1.0 t_CLCL - 5
10
1.0 t_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
MOVX Cycles
t_MCS
0
0
0
2 machine cycles
0
0
0
1
3 machine cycles
4 t_CLCL
0
1
0
4 machine cycles
8 t_CLCL
0
1
1
5 machine cycles
12 t_CLCL
1
0
0
6 machine cycles
16 t_CLCL
1
0
1
7 machine cycles
20 t_CLCL
1
1
0
8 machine cycles
24 t_CLCL
1
1
1
9 machine cycles
28 t_CLCL
Explanation of Logic 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
A
Address
C
Clock
D
Input Data
H
Logic level high
L
Logic level low
I
Instruction
P
PSEN
Q
Output Data
R
RD signal
V
Valid
W
WR signal
X
No longer a valid state
Z
Tri-state
- 84 -