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參數(shù)資料
型號(hào): W77E058A40FL
廠商: WINBOND ELECTRONICS CORP
元件分類: 微控制器/微處理器
英文描述: 8-BIT MICROCONTROLLER
中文描述: 8-BIT, FLASH, 40 MHz, MICROCONTROLLER, PQFP44
封裝: ROHS COMPLIANT, PLASTIC, QFP-44
文件頁(yè)數(shù): 41/87頁(yè)
文件大小: 594K
代理商: W77E058A40FL
W77E058A
Publication Release Date: April 17, 2007
- 41 -
Revision A10
stretching of the instruction only results in the elongation of the MOVX instruction, as if the state 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
M1
M0
MACHINE
CYCLES
RD
OR
WR
STROBE WIDTH
IN CLOCKS
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
0
0
0
0
1
1
1
1
0
0
1
1
0
0
1
1
0
1
0
1
0
1
0
1
2
2
4
8
12
16
20
24
28
3 (default)
4
5
6
7
8
9
Next Instruction
Machine Cycle
Second
Machine cycle
First
Machine cycle
Last Cycle
of Previous
Instruction
C4
PORT 2
PORT 0
WR
PSEN
ALE
CLK
C3
C2
D0-D7
A0-A7
D0-D7
A0-A7
D0-D7
A0-A7
D0-D7
A15-A8
A15-A8
A15-A8
A15-A8
A0-A7
C1
C4
C3
C2
C1
C4
C3
C2
C1
C4
C3
C2
C1
MOVX instruction cycle
Next Inst. Read
Next Inst.
Address
MOVX Data out
MOVX Data
Address
MOVX Inst.
Address
MOVX Inst
.
Figure 8. Data Memory Write with Stretch Value = 0
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