參數(shù)資料
型號(hào): W78L052A
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): 12/26頁(yè)
文件大?。?/td> 214K
代理商: W78L052A
W78LE52/W78L052A
- 12 -
7. SECURITY BITS
During the on-chip Flash EPROM operation 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 W78L052 has a Special Setting Register, the Security Register, which can not be accessed in
normal mode. The Security register can only be accessed from the Flash EPROM 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 Security Register is addressed in the
Flash EPROM operation mode by address #0FFFFh.
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
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
8KB Flash EPROM
Program Memory
Reserved
Security Register
0FFFFh
0000h
1FFFh
Reserved
B2
B7
B7 : Osillator Control
logic 0 : 1/2 gain
logic 1 : Full gain
Lock bit
This bit is used to protect the customer's program code in the W78L052. 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 Registers can not be accessed again.
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