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W78L052C Datasheet(PDF) 10 Page - Winbond |
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W78L052C Datasheet(HTML) 10 Page - Winbond |
10 / 23 page 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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