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參數(shù)資料
| 型號： | W78E365D-40 |
| 英文描述： | Microcontroller |
| 中文描述： | 微控制器 |
| 文件頁數(shù)： | 19/35頁 |
| 文件大?。?/td> | 186K |
| 代理商： | W78E365D-40 |
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Preliminary W78E365
Publication Release Date: April 2001
- 19 -
Revision A1
Security
During the on-chip FLASH EPROM programming mode, the FLASH EPROM can be programmed and
verified repeatedly. Until the code inside the FLASH EPROM is confirmed OK, the code can be
protected. The protection of FLASH EPROM and those operations on it are described below.
The W78E365 has several Special Setting Registers, including the Security Register and
Company/Device ID Registers, which can not 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 contents of the Company ID and Device ID registers
have been set in factory.
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.
Default 1 for all security bits.
Reserved bits must be kept in logic 1.
Special Setting Register
D7 D6 D5 D4 D3 D2 D1 D0
Security Bits
4KB Flash EPROM
ProgramMemory
LDROM
Reserved
Security Register
FFFFh
0000h
0FFFh
Reserved
B2
B2: Encryption
logic 0: the encryption logic enable
logic 1: the encryption logic disable
B7
B07: Osillator Control
logic 0: 1/2 gain
logic 1: Full gain
64KB Flash EPROM
ProgramMemory
APROM
Lock bit
This bit is used to protect the customer's program code in the W78E365. It may be set after the
programmer finishes the programming and verifies sequence. Once this bit is set to logic 0, both the
FLASH EPROM ROM data and Special Setting Registers 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.
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| W78E365F-24 | Microcontroller |
| W78E365F-40 | Microcontroller |
| W78E365P-24 | Microcontroller |
| W78E365P-40 | Microcontroller |
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| W78E365F-24 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Microcontroller |
| W78E365F-40 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Microcontroller |
| W78E365P-24 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Microcontroller |
| W78E365P-40 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Microcontroller |
| W78E374 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Monitor Controller |
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