W78E52B データシートの表示（PDF） - Winbond

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W78E52B

8-BIT MTP MICROCONTROLLER

Winbond 

Preliminary W78E52B

D7 D6 D5 D4 D3 D2 D1 D0

11011010

Company ID (#DAH)

8KB MTP ROM

0000h

11100000

Device ID (#E0H)

Program Memory

B7 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

B7 : Osillator Control

logic 0 : 1/2 gain

logic 1 : Full gain

Default 1 for all security bits. Reserved bits must be kept in logic 1.

Reserved

1FFFh

Security Register 0FFFFh

Special Setting Registers

Lock bit

This bit is used to protect the customer's program code in the W78E52B. 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.

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.

Encryption

This bit is used to enable/disable the encryption logic for code protection. Once encryption feature is

enabled, the data presented on port 0 will be encoded via encryption logic. Only whole chip erase will

reset this bit.

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Publication Release Date: December 1998

Revision A1

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