W79E648 Datasheet, PDF (70/80 Pages) Winbond – Fast 8051 Compatible microcontroller with a redesigned Processor

Preliminary W79E648
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
17.3.3 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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