w77e58 Winbond Electronics Corp America, w77e58 Datasheet - Page 42
w77e58
Manufacturer Part Number
w77e58
Description
8 Bit Microcontroller
Manufacturer
Winbond Electronics Corp America
Datasheet
1.W77E58.pdf
(85 pages)
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of the CPU was held for the desired period. There is no effect on any other instruction or its timing. By
default, the Stretch value is set at 1, giving a MOVX instruction of 3 machine cycles. If desired by the
user the stretch value can be set to 0 to give the fastest MOVX instruction of only 2 machine cycles.
Table 4. Data Memory Cycle Stretch Values
M2
0
0
0
0
1
1
1
1
PORT 0
PORT 2
M1
PSEN
CLK
ALE
WR
0
0
1
1
0
0
1
1
M0
C1
MOVX Inst.
Address
of Previous
Last Cycle
Instruction
A0-A7
C2
0
1
0
1
0
1
0
1
Figure 8. Data Memory Write with Stretch Value = 0
C3
A15-A8
MOVX Inst
C4
D0-D7
Machine
Cycles
3(default)
C1
2
4
5
6
7
8
9
Machine cycle
.
Next Inst.
Address
C2
A0-A7
First
MOVX instruction cycle
- 42 -
C3
A15-A8
Next Inst. Read
strobe width
in Clocks
RD or WR
C4
D0-D7
C1
12
16
20
24
28
2
4
8
MOVX Data
Machine cycle
Address
A0-A7
C2
Second
C3
A15-A8
Preliminary W77E58
MOVX Data out
D0-D7
C4
strobe width
RD or WR
@ 25 MHz
C1
1120 nS
160 nS
320 nS
480 nS
640 nS
800 nS
960 nS
Next Instruction
80 nS
Machine Cycle
A0-A7
C2
C3
A15-A8
C4
D0-D7
strobe width
RD or WR
@ 40 MHz
100 nS
200 nS
300 nS
400 nS
500 nS
600 nS
700 nS
50 nS