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HT85F2240 Datasheet(PDF) 33 Page - Holtek Semiconductor Inc |
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HT85F2240 Datasheet(HTML) 33 Page - Holtek Semiconductor Inc |
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33 / 147 page  Rev. 1.10 �� of 147 ���� �1� �01� A/D Flash 8051 Core Low Pin Count MCU HT85F2230/HT85F2240 Flash Memory Read/Write Operations The flash memory can be read from and written to using register operations. To ensure protection of application data certain protection measures have to be first carried out before any read and write operations are executed on the Flash Memory. Unlocking the Flash Memory Before writing data to the Flash Memory it must first be unlocked. This is implemented by writing a correct data sequence to the Flash Memory Unlock key register, FMKEY. It is recommended to write the data sequence to the FMKEY register in 4 consecutive instructions. The following flowchart illustrates the unlock procedure. START FMKEY = 0x��; FMKEY = 0xAA; FMKEY = 0x00; FMKEY = 0xFF; Bit UNLOCK is 1 For examp�e� 4 consec�tive statements in C �ang�age END Bit UNLOCK is 0 F�ash memor� is in �ocked state F�ash memor� is in �n�ocked state Unlock Procedure Flowchart |
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