W77LE58_07 Datasheet, PDF (69/82 Pages) Winbond – 8-BIT MICROCONTROLLER

W77LE58/W77L058A
10. SECURITY BITS
During the on-chip ROM operation mode, the ROM can be programmed and verified repeatedly. Until
the code inside the ROM is confirmed OK, the code can be protected. The protection of ROM and
those operations on it are described below.
The W77L058 has a Security Register which can not be accessed in normal mode. These registers
can only be accessed from the ROM 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 ROM operation mode by address #0FFFFh.
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Publication Release Date: February 1, 2007
Revision A7