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參數資料
| 型號： | W77E468 |
| 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： | 76/84頁 |
| 文件大小： | 531K |
| 代理商： | W77E468 |
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Preliminary W77E468
- 76 -
B2:Encryption Feature
Both the Seed 0 and Seed 1 are a one-byte flash memory cell that provide the user with encryption
code protection. When program code is programmed to the W77E468 internal MTP ROM and verify it
is correct, then users can program a non-FFh value into either Seed 0 or Seed 1 to start the
encryption logic. When Seed 0 or Seed 1 is presented in non-FFh state, the internal encryption circuit
will generate a sequence of random values, then add to each the program code bytes before they
appear in the data bus. Now the code is scrambled during the read or verify operation. The Seed 0
and Seed 1 have the initial value FFh after chip erased. When the encryption logic is effective, the
user can not disable it except by erasing the chip to recover the Seed 0 and 1 to initial value FFh.
The method for programming Seed 0 and Seed 1 is the same as that used to program internal MTP
ROM, except that the address of Seed 0 is 0FF7Fh, and Seed 1 is 0FF3Fh. When B2 bit is cleared,
Seed 0 and Seed 1 can not be accessed.
ABSOLUTE MAXIMUM RATINGS
SYMBOL
PARAMETER
CONDITION
RATING
UNIT
DC Power Supply
V
DD
V
SS
V
IN
-0.3
+7.0
V
Input Voltage
V
SS
-0.3
V
DD
+0.3
V
Operating Temperature
T
A
0
+70
°
C
°
C
Storage Temperatute
T
ST
-55
+150
Note: Exposure to conditions beyond those listed under Absolute Maximum Ratings may adversely affect the life and reliability
of the device.
DC ELECTRICAL 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
Operating Voltage
Operating Current
V
DD
I
DD
5.5
50
V
mA
No load
V
DD
= 5.5V
Idle mode
V
DD
= 5.5V
Power-down mode
V
DD
= 5.5V
Idle Current
I
IDLE
-
20
mA
Power Down Current
I
PWDN
-
50
μ
A
相關PDF資料 |
PDF描述 |
|---|---|
| W77E516 | 8-BIT MICROCONTROLLER |
| W77E516-25 | 8-BIT MICROCONTROLLER |
| W77E516-40 | 8-BIT MICROCONTROLLER |
| W77E516F-25 | 8-BIT MICROCONTROLLER |
| W77E516F-40 | 8-BIT MICROCONTROLLER |
相關代理商/技術參數 |
參數描述 |
|---|---|
| W77E468F-25 | 制造商:WINBOND 制造商全稱:Winbond 功能描述:8 BIT MICROCONTROLLER |
| W77E468F-40 | 制造商:WINBOND 制造商全稱:Winbond 功能描述:8 BIT MICROCONTROLLER |
| W77E516 | 制造商:WINBOND 制造商全稱:Winbond 功能描述:8-BIT MICROCONTROLLER |
| W77E516-25 | 制造商:WINBOND 制造商全稱:Winbond 功能描述:8-BIT MICROCONTROLLER |
| W77E516-40 | 制造商:WINBOND 制造商全稱:Winbond 功能描述:8-BIT MICROCONTROLLER |
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