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MAX7300ATI Datasheet(PDF) 9 Page - Maxim Integrated Products |
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MAX7300ATI Datasheet(HTML) 9 Page - Maxim Integrated Products |
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9 / 20 page  Any bytes received after the command byte are consid- ered data bytes. The first data byte goes into the internal register of the MAX7300 selected by the command byte (Figure 8). If multiple data bytes are transmitted before a STOP condition is detected, these bytes are gener- ally stored in subsequent MAX7300 internal registers because the command byte address generally autoincre- ments (Table 4). Message Format for Reading The MAX7300 is read using the MAX7300’s internally stored command byte as address pointer, the same way the stored command byte is used as address pointer for a write. The pointer generally autoincrements after each data byte is read using the same rules as for a write (Table 4). Thus, a read is initiated by first configuring the MAX7300’s command byte by performing a write (Figure 7). The master can now read ‘n’ consecutive bytes from the MAX7300, with the first data byte being read from the register addressed by the initialized command byte (Figure 9). When performing read-after-write verification, remember to reset the command byte’s address because the stored control byte address generally has been auto- incremented after the write (Table 4). Table 5 is the regis- ter address map. Figure 4. Bit Transfer Figure 3. Start and Stop Conditions Figure 2. 2-Wire Serial Interface Timing Details SDA SCL DATA LINE STABLE; DATA VALID CHANGE OF DATAALLOWED SDA SCL S START CONDITION P STOP CONDITION SCL SDA START CONDITION STOP CONDITION REPEATED START CONDITION START CONDITION tSU, DAT tHD, DAT tLOW tHD, STA tHIGH tR tF tSU, STA tHD, STA tSU, STO tBUF www.maximintegrated.com Maxim Integrated │ 9 MAX7300 2-Wire-Interfaced, 2.5V to 5.5V, 20-Port or 28-Port I/O Expander |
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