
Preliminary W78E365
- 20 -
Encryption
This bit is used to enable/disable the encryption logic for code protection. Once encryption feature is
enabled, the data presented on port 0 will be encoded via encryption logic. Only whole chip erase will
reset this bit.
Oscillator Control
W78E365 allow user to diminish the gain of on-chip oscillator amplifier by using programmer to set the
bit B7 of security register. Once B7 is set to 0, a half of gain will be decreased. Care must be taken if
user attempts to diminish the gain of oscillator amplifier, reducing a half of gain may improperly affect
the external crystal operation at high frequency above 24 MHz. The value of R and C1,C2 may need
some adjustment while running at lower gain.
ABSOLUTE MAXIMUM RATINGS
ITEM
1
2
3
4
SYMBOL
V
DD
V
SS
V
IN
T
A
T
ST
PARAMETER
DC Power Supply
Input Voltage
Operating Temperature
Storage Temperature
MIN.
-0.3
V
SS
-0.3
0
-55
MAX.
+6.0
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.
D.C. ELECTRICAL CHARACTERISTICS
(V
DD
-V
SS
= 5V
±
10%, T
A
= 25
°
C, Fosc = 20 MHz, unless otherwise specified.)
SYMBOL
V
DD
I
DD
PARAMETER
Operating Voltage
Operating Current
SPECIFICATION
MIN.
MAX.
4.5
5.5
-
TEST CONDITIONS
RST = 1, P0 = V
DD
No load
V
DD
= 5.5V
Idle mode
V
DD
= 5.5V
Power-down mode
V
DD
= 5.5V
V
DD
= 5.5V
V
IN
= 0V or V
DD
V
DD
= 5.5V
0<V
IN
<V
DD
UNIT
V
mA
20
I
IDLE
Idle Current
-
6
mA
I
PWDN
Power Down Current
-
50
μ
A
I
IN1
Input Current
P1, P2, P3, P4
Input Current RST
-50
+10
μ
A
I
IN2
-10
+300
μ
A