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11LC020-E/MS Datasheet(PDF) 12 Page - Microchip Technology |
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11LC020-E/MS Datasheet(HTML) 12 Page - Microchip Technology |
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12 / 38 page  11AAXXX/11LCXXX DS22067E-page 12 Preliminary © 2008 Microchip Technology Inc. 4.3 Write Instruction Prior to any attempt to write data to the 11XX, the write enable latch must be set by issuing the WREN instruction (see Section 4.4). Once the write enable latch is set, the user may pro- ceed with issuing a WRITE instruction (including the header and device address bytes) followed by the MSB and LSB of the Word Address. Once the last Acknowl- edge sequence has been performed, the master transmits the data byte to be written. The 11XX features a 16-byte page buffer, meaning that up to 16 bytes can be written at one time. To utilize this feature, the master can transmit up to 16 data bytes to the 11XX, which are temporarily stored in the page buf- fer. After each data byte, the master sends a MAK, indi- cating whether or not another data byte is to follow. A NoMAK indicates that no more data is to follow, and as such will initiate the internal write cycle. Upon receipt of each word, the four lower-order Address Pointer bits are internally incremented by one. The higher-order bits of the word address remain con- stant. If the master should transmit data past the end of the page, the address counter will roll over to the begin- ning of the page, where further received data will be written. FIGURE 4-3: WRITE COMMAND SEQUENCE Note: If a NoMAK is generated before any data has been provided, or if a standby pulse occurs before the NoMAK is generated, the 11XX will be reset, and the write cycle will not be initiated. Note: Page write operations are limited to writ- ing bytes within a single physical page, regardless of the number of bytes actu- ally being written. Physical page bound- aries start at addresses that are integer multiples of the page size (16 bytes) and end at addresses that are integer multi- ples of the page size minus 1. As an example, the page that begins at address 0x30 ends at address 0x3F. If a page Write command attempts to write across a physical page boundary, the result is that the data wraps around to the beginning of the current page (over- writing data previously stored there), instead of being written to the next page as might be expected. It is therefore necessary for the application software to prevent page write operations that would attempt to cross a page bound- ary. 76 5 4 Data Byte 1 32 1 0 76 5 4 Data Byte 2 32 1 0 76 5 4 Data Byte n 32 1 0 SCIO 11 0 1 0 1 00 Start Header SCIO Device Address 00 0 0 1 0 10 Command 10 1 0 1 1 00 Standby Pulse SCIO 15 14 13 12 Word Address MSB 11 10 9 8 76 5 4 Word Address LSB 32 1 0 Twc |
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