W77E532 Datasheet, PDF (38/86 Pages) Winbond – 8 BIT MICROCONTROLLER

W77E532/W77E532A
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
MACHINE
RD OR WR
M2
M1
M0
CYCLES
STROBE WIDTH
IN CLOCKS
0
0
0
2
2
0
0
1
3 (default)
4
0
1
0
4
8
0
1
1
5
12
1
0
0
6
16
1
0
1
7
20
1
1
0
8
24
1
1
1
9
28
RD OR WR
STROBE WIDTH
@ 25 MHZ
80 nS
160 nS
320 nS
480 nS
640 nS
800 nS
960 nS
1120 nS
RD OR WR
STROBE WIDTH
@ 40 MHZ
50 nS
100 nS
200 nS
300 nS
400 nS
500 nS
600 nS
700 nS
CLK
ALE
PSEN
WR
PORT 0
PORT 2
Last Cycle
of Previous
Instruction
First
Machine cycle
Second
Machine cycle
MOVX instruction cycle
Next Instruction
Machine Cycle
C1 C2 C3 C4 C1 C2 C3 C4 C1 C2 C3 C4 C1 C2 C3 C4
A0-A7
D0-D7
A0-A7
D0-D7
A0-A7
D0-D7
A0-A7
D0-D7
MOVX Inst.
Address
Next Inst.
Address
MOVX Data
Address
MOVX Inst.
Next Inst. Read MOVX Data out
A15-A8
A15-A8
A15-A8
A15-A8
Figure 8. Data Memory Write with Stretch Value = 0
- 38 -
Publication Release Date: June 30, 2009
Revision A10