W79E548 Datasheet, PDF (69/79 Pages) Winbond – 8-BIT MICROCONTROLLER

W79E548/W79L548
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
18.3.3 Program Memory Read Cycle
ALE
PSEN
PORT 0
PORT 2
t_LHLL
t_AVLL
t_LLIV
t_LLAX1
t_PLPH
t_PLIV
t_LLPL
t_PLAZ
t_PXIX
t_PXIZ
ADDRESS
A0-A7
t_AVIV1
t_AVIV2
INSTRUCTION
IN
ADDRESS A8-A15
ADDRESS
A0-A7
ADDRESS A8-A15
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Publication Release Date: December 12, 2005
Revision A1