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參數資料
型號: W79E648
廠商: WINBOND ELECTRONICS CORP
英文描述: Fast 8051 Compatible microcontroller with a redesigned Processor
中文描述: 快速8051兼容微控制器重新設計的處理器
文件頁數: 60/80頁
文件大小: 407K
代理商: W79E648
Preliminary W79E648
- 60 -
Examples of Timed Assessing are shown below.
Example 1: Valid access
MOV
MOV
MOV
TA, #0AAh
TA, #055h
WDCON, #00h 3 M/C
3 M/C
3 M/C
Note: M/C = Machine Cycles
Example 2: Valid access
MOV
MOV
NOP
SETB EWT
TA, #0AAh
TA, #055h
3 M/C
3 M/C
1 M/C
2 M/C
Example 3: Valid access
MOV
MOV
ORL
TA, #0Aah
TA, #055h
WDCON, #00000010B 3M/C
3 M/C
3 M/C
Example 4: Invalid access
MOV
MOV
NOP
NOP
CLR
TA, #0AAh
TA, #055h
POR
3 M/C
3 M/C
1 M/C
1 M/C
2 M/C
Example 5: Invalid Access
MOV
NOP
MOV
SETB EWT
TA, #0AAh
TA, #055h
3 M/C
1 M/C
3 M/C
2 M/C
In the first two examples, the writing to the protected bits is done before the 3 machine cycle window
closes. In Example 3, however, the writing to the protected bit occurs after the window has closed,
and so there is effectively no change in the status of the protected bit. In Example 4, the second write
to TA occurs 4 machine cycles after the first write, therefore the timed access window in not opened at
all, and the write to the protected bit fails.
相關PDF資料
PDF描述
W79E802 8-BIT MICROCONTROLLER
W79E802A 8-BIT MICROCONTROLLER
W79E802ADG 8-BIT MICROCONTROLLER
W79E802ASG 8-BIT MICROCONTROLLER
W79E803 8-BIT MICROCONTROLLER
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