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24LC08BISN Datasheet(PDF) 8 Page - Microchip Technology |
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24LC08BISN Datasheet(HTML) 8 Page - Microchip Technology |
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8 / 40 page  24AA08/24LC08B DS21710K-page 8 2002-2012 Microchip Technology Inc. 6.0 WRITE OPERATION 6.1 Byte Write Following the Start condition from the master, the device code (4 bits), the block address (3 bits) and the R/W bit, which is a logic-low, is placed onto the bus by the master transmitter. This indicates to the addressed slave receiver that a byte with a word address will follow once it has generated an Acknowledge bit during the ninth clock cycle. Therefore, the next byte transmit- ted by the master is the word address and will be written into the Address Pointer of the 24XX08. After receiving another Acknowledge signal from the 24XX08, the master device will transmit the data word to be written into the addressed memory location. The 24XX08 acknowledges again and the master generates a Stop condition. This initiates the internal write cycle and, during this time, the 24XX08 will not generate Acknowledge signals (Figure 6-1). 6.2 Page Write The write control byte, word address and the first data byte are transmitted to the 24XX08 in the same way as in a byte write. However, instead of generating a Stop condition, the master transmits up to 16 data bytes to the 24XX08, which are temporarily stored in the on- chip page buffer and will be written into memory once the master has transmitted a Stop condition. Upon receipt of each word, the four lower-order Address Pointer bits are internally incremented by ‘ 1’. The higher-order 7 bits of the word address remain constant. If the master should transmit more than 16 words prior to generating the Stop condition, the address counter will roll over and the previously received data will be overwritten. As with the byte write operation, once the Stop condition is received an internal write cycle will begin (Figure 6-2). 6.3 Write Protection The WP pin allows the user to write-protect the entire array (000-3FF) when the pin is tied to VCC. If the pin is tied to VSS the write protection is disabled. The Chip Select package does not support the write- protect feature. FIGURE 6-1: BYTE WRITE FIGURE 6-2: PAGE WRITE Note: Page write operations are limited to writ- ing bytes within a single physical page, regardless of the number of bytes actually being written. Physical page boundaries start at addresses that are integer multiples of the page buffer size (or ‘page-size’) and end at addresses that are integer multiples of [page size – 1]. 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 (overwriting 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 boundary. S P Bus Activity Master SDA Line Bus Activity S T A R T S T O P Control Byte Word Address Data A C K A C K A C K x = “don’t care” 10 1 0X B1 B0 0 Block Select Bits S P Bus Activity Master SDA Line Bus Activity S T A R T Control Byte Word Address (n) Data (n) Data (n + 15) S T O P A C K A C K A C K A C K A C K Data (n + 1) x = “don’t care” Block Select Bits 1 1 0 0X B1B00 |
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