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參數(shù)資料
型號(hào): W77E468
廠商: WINBOND ELECTRONICS CORP
元件分類: 8位微控制器
英文描述: 8 BIT MICROCONTROLLER
中文描述: 8位微控制器
文件頁數(shù): 42/84頁
文件大?。?/td> 531K
代理商: W77E468
Preliminary W77E468
- 42 -
The instruction starts off as a normal op-code fetch of 4 clocks. In the next machine cycle, the
W77E468 puts out the address of the external Data Memory and the actual access occurs here. The
user can change the duration of this access time by setting the STRETCH value. The Clock Control
SFR (CKCON) has three bits that control the stretch value. These three bits are M2-0 (bits 2-0 of
CKCON). These three bits give the user 8 different access time options. The stretch can be varied
from 0 to 7, resulting in MOVX instructions that last from 2 to 9 machine cycles in length. Note that
the 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
RD
or
WR
strobe width
@40 MHz
0
0
0
2
2
80 nS
50 nS
0
0
1
3(default)
4
160 nS
100 nS
0
1
0
4
8
320 nS
200 nS
0
1
1
5
12
480 nS
300 nS
1
0
0
6
16
640 nS
400 nS
1
0
1
7
20
800 nS
500 nS
1
1
0
8
24
960 nS
600 nS
1
1
1
9
28
1120 nS
700 nS
相關(guān)PDF資料
PDF描述
W77E516 8-BIT MICROCONTROLLER
W77E516-25 8-BIT MICROCONTROLLER
W77E516-40 8-BIT MICROCONTROLLER
W77E516F-25 8-BIT MICROCONTROLLER
W77E516F-40 8-BIT MICROCONTROLLER
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
W77E468F-25 制造商:WINBOND 制造商全稱:Winbond 功能描述:8 BIT MICROCONTROLLER
W77E468F-40 制造商:WINBOND 制造商全稱:Winbond 功能描述:8 BIT MICROCONTROLLER
W77E516 制造商:WINBOND 制造商全稱:Winbond 功能描述:8-BIT MICROCONTROLLER
W77E516-25 制造商:WINBOND 制造商全稱:Winbond 功能描述:8-BIT MICROCONTROLLER
W77E516-40 制造商:WINBOND 制造商全稱:Winbond 功能描述:8-BIT MICROCONTROLLER