
Preliminary W77IC32
- 62 -
MOV
NOP
NOP
CLR
TA, #055h
POR
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.
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
-40
-55
RATING
+7.0
V
DD
+0.3
+85
+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 ELECTRICAL CHARACTERISTICS
(T
A
= -40~+85
°
C, Fosc = 20 MHz, unless otherwise specified.)
PARAMETER
Operating Voltage
Operating Current
Idle Current
Power Down Current
Input Current
P1, P2, P3, P4
Input Current RST
[*1]
SYMBOL
V
DD
I
DD
I
IDLE
I
PWDN
I
IN1
SPECIFICATION
MIN.
MAX.
2.7
5.5
-
50
15
-
20
12
-
10
-
10
-70
+10
TEST CONDITIONS
UNIT
V
mA
mA
mA
mA
μ
A
μ
A
μ
A
No load, V
DD
= RST = 5.5V
No load, V
DD
= RST = 3.0V
No load, V
DD
= 5.5V
No load, V
DD
= 3.0V
No load, V
DD
= 5.5V
No load, V
DD
= 3.0V
V
DD
= 5.5V
V
IN
= 0V or V
DD
V
DD
= 5.5V
0<V
IN
<V
DD
I
IN2
-10
+300
μ
A