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參數(shù)資料
| 型號： | 7544 |
| 英文描述： | 3.3V LDO POSITVE VOLTAGE REGULATOR 2% TOL. |
| 中文描述： | 7544Group數(shù)據(jù)表數(shù)據(jù)表503K/JUN.25.03 |
| 文件頁數(shù)： | 43/54頁 |
| 文件大?。?/td> | 503K |
| 代理商： | 7544 |
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Rev.1.02 2003.06.25 page 43 of 53
7544 Group
PRELIMINARY
Notice: This is not a final specification.
Some parametric limits are subject to change.
ROM Code Access Protection
We would like to support a simple ROM code protection function
that prevents a party other than the ROM-code owner to read and
reprogram the builit-in PROM code of the MCU.
The MCU has 7 bytes of dedicated ROM spaces in address
0xFFD4 to 0xFFDA, as an ID-code (referred to as
“
the ID-code
”
)
enabling a Programmer to verify with the input ID-code and
validate further operations.
Expected Programmer ID-Code Verification
Function
First, Programmer must check the ID-code of the MCU.
If the ID-code is still in blank, Programmer enebles all operations,
Read, Program, and Program-Verify.
When Programmer programs the MCU, Programmer also
programs the given ID-code as well as the actual firmware.
If the ID-code is not blank, Programmer verifies it with the input
ID-code.
When the ID-codes don't mutch, Programmer will reject all further
operations.
If they match, Programmer perform operations according to the
given command.
ID1
ID2
ID3
ID4
ID5
ID6
ID7
Address
FFD4
16
FFD5
16
FFD6
16
FFD7
16
FFD8
16
FFD9
16
FFDA
16
Fig. 50 ROM-Code Protection ID Location
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