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DS1985 Datasheet(PDF) 6 Page - Dallas Semiconductor |
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DS1985 Datasheet(HTML) 6 Page - Dallas Semiconductor |
6 / 25 page DS1985 6 of 25 If a Page Address Redirection Byte has a FFH value, the data in the main memory that corresponds to that page is valid. If a Page Address Redirection Byte has some other hex value, the data in the page corresponding to that redirection byte is invalid, and the valid data can now be found at the one’s complement of the page address indicated by the hex value stored in the associated Page Address Redirection Byte. A value of FDH in the redirection byte for page 1, for example, would indicate that the updated data is now in page 2. The details for reading and programming the EPROM status memory portion of the DS1985 are given in the Memory Function Commands section. DS 1985 MEMORY MAP Figure 4 REDIRECTION BYTES BIT MAP OF USED PAGES WRITE-PROTECT BITS REDIRECTION BYTES WRITE-PROTECT BITS DATA MEMORY STATUS MEMORY MAP BIT 0 OF ADDRESS 000H= WRITE PROTECT OF PAGE 0, ETC. ADDRESS 100H=PAGE ADDRESS REDIRECTION BYTE FOR PAGE 0, ETC . 8-BIT SCRATCHPAD 88 BYTES STATUS MEMORY |
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