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전자부품 데이터시트 검색엔진 |
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전자부품 데이터시트 검색엔진 |
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HT85F2270 데이터시트(PDF) 37 Page - Holtek Semiconductor Inc |
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HT85F2270 데이터시트(HTML) 37 Page - Holtek Semiconductor Inc |
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37 / 226 page  Rev. 1.00 �7 of ��6 �a� 1�� �01� Standard 8051 8-Bit Flash MCU HT85F2260/HT85F2270/HT85F2280 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 F�KEY = 0x��; F�KEY = 0xAA; F�KEY = 0x00; F�KEY = 0xFF; Bit UNLOCK is 1 For example� 4 consecutive statements in C language END Bit UNLOCK is 0 Flash memor� is in locked state Flash memor� is in unlocked state Unlock Procedure Flowchart |
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