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參數(shù)資料
| 型號： | C508 |
| 廠商： | INFINEON TECHNOLOGIES AG |
| 元件分類： | 8位微控制器 |
| 英文描述： | 8-Bit CMOS Microcontroller |
| 中文描述： | 8位CMOS微控制器 |
| 文件頁數(shù)： | 68/93頁 |
| 文件大小： | 1204K |
| 代理商： | C508 |
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C508
Data Sheet
64
2000-08
Lock Bits Programming/Read
The C508-4E has two programmable lock bits which, when programmed according to
Table 16
, provide four levels of protection for the on-chip OTP code memory. The state
of the lock bits can also be read.
Note:
A ‘1’ means that the lock bit is unprogrammed, a ‘0’ means that lock bit is
programmed.
Table 16
Lock Bits at D1,D0 Protection
D1
D0
1
1
Lock Bit Protection Types
Level
Protection Type
Level 0
The OTP lock feature is disabled. During normal
operation of the C508-4E, the state of the EA pin is
not latched on reset.
During normal operation of the C508-4E, MOVC
instructions executed from external program memory
are disabled from fetching code bytes from internal
memory. EA is sampled and latched on reset. An
OTP memory read operation is only possible
according to OTP verification mode 2. Further
programming of the OTP memory is disabled
(reprogramming security).
Same as Level 1, but also OTP memory read
operation using OTP verification mode is disabled.
Same as Level 2, but additionally external code
execution by setting EA = low during normal
operation of the C508-4E is no longer possible.
External code execution, initiated by an internal
program (e.g. by an internal jump instruction above
the OTP memory boundary), is still possible.
1
0
Level 1
0
1
Level 2
0
0
Level 3
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