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參數(shù)資料
| 型號(hào)： | W78L516A24PL |
| 廠商： | WINBOND ELECTRONICS CORP |
| 元件分類： | 微控制器/微處理器 |
| 英文描述： | 8-BIT MICROCONTROLLER |
| 中文描述： | 8-BIT, FLASH, 20 MHz, MICROCONTROLLER, PQCC44 |
| 封裝： | ROHS COMPLIANT, PLASTIC, LCC-44 |
| 文件頁數(shù)： | 20/37頁 |
| 文件大小： | 256K |
| 代理商： | W78L516A24PL |
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W78LE516/W78L516A
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6. SECURITY
During the on-chip ROM programming mode, the Flash EPROM 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 W78L516 has a Security Register 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 Security Register is located at the 0FFFFH of
the LD FLASH EPROM space.
B0
B1
B0: Lock bit, logic 0: active
B1: MOVC inhibit,
logic 0: the MOVC instruction in external memory
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
logic 1: no restriction.
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
64KB On-chip ROM
ProgramMemory
APROM
6.1 Lock bit
This bit is used to protect the customer's program code in the W78L516. 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 data and Special Setting Register can be accessed again.
6.2 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 FLASH EPROM 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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PDF描述 |
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| W78LE516A | 8-BIT MICROCONTROLLER |
| W78L516A24DL | 8-BIT MICROCONTROLLER |
| W78L516A24FL | 8-BIT MICROCONTROLLER |
| W78L516A24LL | 8-BIT MICROCONTROLLER |
| W78L52 | 8-BIT MICROCONTROLLER |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| W78L51F-24 | 制造商:WINBOND 制造商全稱:Winbond 功能描述:8-BIT MICROCONTROLLER |
| W78L51P-24 | 制造商:WINBOND 制造商全稱:Winbond 功能描述:8-BIT MICROCONTROLLER |
| W78L52 | 制造商:WINBOND 制造商全稱:Winbond 功能描述:8-BIT MICROCONTROLLER |
| W78L52-24 | 制造商:WINBOND 制造商全稱:Winbond 功能描述:8-BIT MICROCONTROLLER |
| W78L52F-24 | 制造商:WINBOND 制造商全稱:Winbond 功能描述:8-BIT MICROCONTROLLER |
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