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W78L052C Datasheet(PDF) 10 Page - Winbond

Part # W78L052C
Description  8-BIT MICROCONTROLLER
Download  23 Pages
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Manufacturer  WINBOND [Winbond]
Direct Link  http://www.winbond.com
Logo WINBOND - Winbond

W78L052C Datasheet(HTML) 10 Page - Winbond

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W78LE52C/W78L052C
- 10 -
6.
ON-CHIP FLASH EPROM CHARACTERISTICS
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 W78L052C 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.
Default 1 for all security bits.
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
B2 : Encryption
logic 0 : the encryption logic enable
logic 1 : the encryption logic disable
Reserved bits must be kept in logic 1.
B7
B7 : Osillator Control
logic 0 : 1/2 gain
logic 1 : Full gain


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