- 您現在的位置：買賣IC網 > PDF目錄363895 > W77LE532 (WINBOND ELECTRONICS CORP) 8 BIT MICROCONTROLLER PDF資料下載
參數資料
| 型號： | W77LE532 |
| 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： | 64/85頁 |
| 文件大小： | 2458K |
| 代理商： | W77LE532 |
第1頁第2頁第3頁第4頁第5頁第6頁第7頁第8頁第9頁第10頁第11頁第12頁第13頁第14頁第15頁第16頁第17頁第18頁第19頁第20頁第21頁第22頁第23頁第24頁第25頁第26頁第27頁第28頁第29頁第30頁第31頁第32頁第33頁第34頁第35頁第36頁第37頁第38頁第39頁第40頁第41頁第42頁第43頁第44頁第45頁第46頁第47頁第48頁第49頁第50頁第51頁第52頁第53頁第54頁第55頁第56頁第57頁第58頁第59頁第60頁第61頁第62頁第63頁當前第64頁第65頁第66頁第67頁第68頁第69頁第70頁第71頁第72頁第73頁第74頁第75頁第76頁第77頁第78頁第79頁第80頁第81頁第82頁第83頁第84頁第85頁
Preliminary W77LE532
- 64 -
When the software writes AAh to the TA SFR, a counter is started. This counter waits for 3 machine
cycles looking for a write of 55h to TA. If the second write (55h) occurs within 3 machine cycles of the
first write (AAh), then the timed access window is opened. It remains open for 3 machine cycles,
during which the user may write to the protected bits. Once the window closes the procedure must be
repeated to access the other protected bits.
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
Example 3: Valid access
MOV
MOV
ORL
TA, #0AAh
TA, #055h
3 M/C
3 M/C
1 M/C
2 M/C
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
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 |
|---|---|
| W77LE58 | 8 BIT MICROCONTROLLER |
| W77LE58-25 | 8 BIT MICROCONTROLLER |
| W77LE58F-25 | 8 BIT MICROCONTROLLER |
| W77LE58P-25 | 8 BIT MICROCONTROLLER |
| W78151 | 8-BIT Microcontroller(8位的微控制器) |
相關代理商/技術參數 |
參數描述 |
|---|---|
| W77LE532_07 | 制造商:WINBOND 制造商全稱:Winbond 功能描述:8-BIT MICROCONTROLLER |
| W77LE58 | 制造商:WINBOND 制造商全稱:Winbond 功能描述:8 BIT MICROCONTROLLER |
| W77LE58_07 | 制造商:WINBOND 制造商全稱:Winbond 功能描述:8-BIT MICROCONTROLLER |
| W77LE58-25 | 制造商:WINBOND 制造商全稱:Winbond 功能描述:8 BIT MICROCONTROLLER |
| W77LE58F-25 | 制造商:WINBOND 制造商全稱:Winbond 功能描述:8 BIT MICROCONTROLLER |
發布緊急采購，3分鐘左右您將得到回復。