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參數(shù)資料
| 型號： | W78E58BP |
| 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(shù)： | 17/31頁 |
| 文件大?。?/td> | 419K |
| 代理商： | W78E58BP |
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W78E58B
Publication Release Date: March 18, 2002
- 17 -
Revision A3
7. SECURITY
During the on-chip ROM programming mode, the ROM can be programmed and verified repeatedly.
Until the code inside the ROM is confirmed OK, the code can be protected. The protection of ROM and
those operations on it are described below.
The W78E58B has a Security Register that can be accessed in programming mode. Those bits of the
Security Registers can not be changed once they have been programmed from high to low. They can
only be reset through erase-all operation. The Security Register is located at the 0FFFFH of the
LDROM space.
B0
B1
B0: Lock bit, logic 0: active
B1: MOVC inhibit,
logic 0: the MOVC instruction in external memory
cannot access the code in internal memory.
logic 1: no restriction.
B2: Encryption
logic 0: the encryption logic enable
logic 1: the encryption logic disable
B07: Osillator Control
logic 0: 1/2 gain
logic 1: Full gain
Default 1 for all security bits.
Reserved bits must be kept in logic 1.
Special Setting Register
Security Bits
4KB On-chip ROM
ProgramMemory
LDROM
Reserved
Security Register
FFFFh
0000h
0FFFh
Reserved
B2
B7
32KB On-chip ROM
ProgramMemory
APROM
7FFFh
Lock Bit
This bit is used to protect the customer's program code in the W78E58B. It may be set after the
programmer finishes the programming and verifies sequence. Once this bit is set to logic 0, both the
ROM data and Security Register can not be accessed again.
MOVC Inhibit
This bit is used to restrict the accessible region of the MOVC instruction. It can prevent the MOVC
instruction in external program memory from reading the internal program code. When this bit is set to
logic 0, a MOVC instruction in external program memory space will be able to access code only in the
external memory, not in the internal memory. A MOVC instruction in internal program memory space
will always be able to access the ROM data in both internal and external memory. If this bit is logic 1,
there are no restrictions on the MOVC instruction.
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.
相關PDF資料 |
PDF描述 |
|---|---|
| W78E58F-16 | 8-BIT MICROCONTROLLER |
| W78E58F-24 | 8-BIT MICROCONTROLLER |
| W78E58P-16 | 8-BIT MICROCONTROLLER |
| W78E58P-24 | 8-BIT MICROCONTROLLER |
| W78E58P-40 | 8-BIT MICROCONTROLLER |
相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| W78E58F-16 | 制造商:WINBOND 制造商全稱:Winbond 功能描述:8-BIT MICROCONTROLLER |
| W78E58F-24 | 制造商:WINBOND 制造商全稱:Winbond 功能描述:8-BIT MICROCONTROLLER |
| W78E58F-40 | 制造商:WINBOND 制造商全稱:Winbond 功能描述:8-BIT MICROCONTROLLER |
| W78E58M-16 | 制造商:WINBOND 制造商全稱:Winbond 功能描述:8-BIT MICROCONTROLLER |
| W78E58M-24 | 制造商:WINBOND 制造商全稱:Winbond 功能描述:8-BIT MICROCONTROLLER |
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