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24LC02B Datasheet(PDF) 7 Page - Microchip Technology |
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24LC02B Datasheet(HTML) 7 Page - Microchip Technology |
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7 / 24 page  2003 Microchip Technology Inc. DS21709C-page 7 24AA02/24LC02B 4.0 WRITE OPERATION 4.1 Byte Write Following the Start condition from the master, the device code (4 bits), the block address (3 bits, ‘don’t cares’) 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 Acknowl- edge bit during the ninth clock cycle. Therefore, the next byte transmitted by the master is the word address and will be written into the address pointer of the 24XX02. After receiving another Acknowledge signal from the 24XX02, the master device will transmit the data word to be written into the addressed memory location. The 24XX02 acknowledges again and the master generates a Stop condition. This initiates the internal write cycle and, during this time, the 24XX02 will not generate Acknowledge signals (Figure 4-1). 4.2 Page Write The write-control byte, word address and the first data byte are transmitted to the 24XX02 in the same way as in a byte write. However, instead of generating a Stop condition, the master transmits up to 8 data bytes to the 24XX02, 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 8 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 4-2). FIGURE 4-1: BYTE WRITE FIGURE 4-2: PAGE WRITE Note: Page write operations are limited to writing 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 S P BUS ACTIVITY MASTER SDA LINE BUS ACTIVITY S T A R T CONTROL BYTE WORD ADDRESS (n) DATA (n) DATA (n + 7) S T O P A C K A C K A C K A C K A C K DATA (n + 1) |
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Similar Description - 24LC02B |
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