W77LE58_07 Datasheet, PDF (70/82 Pages) Winbond – 8-BIT MICROCONTROLLER

W77LE58/W77L058A
B0: Lock bit
This bit is used to protect the customer's program code in the W77L058. It may be set after the
programmer finishes the programming and verifies sequence. Once this bit is set to logic 0, both the
ROM data and Special Setting Registers can not be accessed again.
B1: 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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