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參數(shù)資料
型號(hào): W77C32
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): 62/71頁
文件大小: 860K
代理商: W77C32
Preliminary W77C32
- 62 -
Example 3: Invalid access
MOV
MOV
NOP
NOP
CLR
TA, #0AAh
TA, #055h
3 M/C
3 M/C
1 M/C
1 M/C
2 M/C
POR
Example 4: Invalid Access
MOV
NOP
MOV
SETB
TA, #0AAh
3 M/C
1 M/C
3 M/C
2 M/C
TA, #055h
EWT
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.
ABSOLUTE MAXIMUM RATINGS
PARAMETER
DC Power Supply
Input Voltage
Operating Temperature
Storage Temperatute
SYMBOL
V
DD
-V
SS
V
IN
T
A
Tst
CONDITION
-0.3
V
SS
-0.3
0
-55
RATING
+7.0
V
DD
+0.3
+70
+150
UNIT
V
V
°
C
°
C
Note: Exposure to conditions beyond those listed under Absolute Maximum Ratings may adversely affect the life and reliability of the
device.
DC CHARACTERISTICS
(V
DD
V
SS
= 5V
±
10%, T
A
= 25
°
C, Fosc = 20 MHz, unless otherwise specified.)
PARAMETER
SYMBOL
SPECIFICATION
MIN.
MAX.
4.5
-
TEST CONDITIONS
UNIT
V
mA
Operating Voltage
Operating Current
V
DD
I
DD
5.5
50
No load
V
DD
= RST = 5.5V
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