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The microcontroller must terminate the page write order stop condition

已有 113 次閱讀 19-11-14 06:05 PM |個人分類:electronic component

A page write is initiated the same as a byte write, but the microcontroller does not senda stop condition after the first data word is clocked in.

Instead, after the EEPROMacknowledges receipt of the first data word, the microcontroller can transmit up to seven(2K) or fifteen (4K) more data words.

The EEPROM will respond with a “0” after eachdata word received. The microcontroller must terminate the page write sequence with astop condition.The data word address lower three (2K) or four (4K) bits are internally incremented fol-lowing the receipt of each data word.

The higher data word address bits are notincremented, retaining the memory page row location. When the word address, inter-nally generated, reaches the page boundary, the following byte is placed at thebeginning of the same page.

If more than eight (2K) or sixteen (4K) data words aretransmitted to the EEPROM, the data word address will “roll over” and previous data willbe overwritten.ACKNOWLEDGE POLLING: Once the internally-timed write cycle has started and theEEPROM inputs are disabled, acknowledge polling can be initiated.

This involves send-ing a start condition followed by the device address word. The read/write bit isrepresentative of the operation desired.

Only if the internal write cycle has completedwill the EEPROM respond with a “0” allowing the read or write sequence to continue.

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