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參數(shù)資料
型號: W77L32
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): 65/74頁
文件大小: 871K
代理商: W77L32
Preliminary W77L32
Publication Release Date: November 2, 2001
- 65 - Revision A1
Examples of Timed Assessing are shown below.
Example 1: Valid access
MOV
TA, #0AAh
MOV
TA, #055h
MOV
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: 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 4: 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.
13. ABSOLUTE MAXIMUM RATINGS
PARAMETER
DC Power Supply
SYMBOL
V
DD
V
SS
V
IN
T
A
CONDITION
-0.3
RATING
+7.0
UNIT
V
Input Voltage
Operating Temperature
V
SS
-0.3
0
V
DD
+0.3
+70
V
°
C
°
C
Storage Temperatute
Tst
-55
+150
Note: Exposure to conditions beyond those listed under Absolute Maximum Ratings may adversely affect the life and reliability
of the device.
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