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參數(shù)資料
型號(hào)： 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(yè)數(shù)： 75/84頁(yè)
文件大?。?/td> 531K
代理商： W77E468
Preliminary W77E468
Publication Release Date: January 1999
- 75 - Revision A1
Security Bits
During the on-chip MTP ROM operation mode, the MTP ROM can be programmed and verified
repeatedly. Until the code inside the MTP ROM is confirmed OK, the code can be protected. The
protection of MTP ROM and those operations on it are described below.
The W77E468 has several Special Setting Registers, including the Security Register and
Company/Device ID Registers, which can not be accessed in normal mode. These registers can only
be accessed from the MTP ROM operation 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. Both
registers are addressed by the A0 address line during the same specific condition.
The Security Register is addressed in the MTP-ROM operation mode by address #0FFFFh.
B0
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 : Seed 0 & 1 access inhibit
Default 1 for each bit.
Company ID (#DAH)
D7 D6 D5 D4 D3 D2 D1 D0
1
1
0
1
1
0
1
0
Device ID (#62H)
0
1
1
1
0
0
0
Security Bits
0
32KB MTP ROM
Program Memory
Reserved
Security Register
0FFFFh
0000h
7FFFh
Seed 1
Seed 0
0FF7Fh
0FF3Fh
Reserved
On-Chip
B1
B2
Special Setting Registers
B0:Lock bit
This bit is used to protect the customer's program code in the W77E468. It may be set after the
programmer finishes the programming and verifies sequence. Once this bit is set to logic 0, both the
MTP ROM data and Special Setting Registers can not be accessed again.
B1: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.
相關(guān)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(guān)代理商/技術(shù)參數(shù)
參數(shù)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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