W78LE812(2006) Просмотр технического описания (PDF) - Winbond

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W78LE812
(Rev.:2006)

8-BIT MICROCONTROLLER

Winbond 

W78LE812/W78L812A

D7 D6 D5 D4 D3 D2 D1 D0

Reserved B2 B1 B0

Security Bits

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

0000h

8KB Flash EPROM

Program Memory

Reserved

1FFFh

Default 1 for all security bits.

Reserved bits must be kept in logic 1.

Security Register 0FFFFh

Special Setting Register

6.8.1 Lock Bit

This bit is used to protect the customer's program code in the W78L812. It may be set after the

programmer finishes the programming and verifies sequence. Once this bit is set to logic 0, both the

on-chip ROM data and Special Setting Registers can not be accessed again.

6.8.2 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 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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Publication Release Date: November 6, 2006

Revision A9

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