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DS1847 Datasheet(PDF) 9 Page - Dallas Semiconductor |
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DS1847 Datasheet(HTML) 9 Page - Dallas Semiconductor |
9 / 17 page DS1847 9 of 17 The master must terminate the write cycle with a STOP condition or the data clocked into the DS1847 will not be latched into permanent memory. Acknowledge Polling: Once the internally-timed write has started and the DS1847 inputs are disabled, acknowledge polling can be initiated. The process involves transmitting a START condition followed by the device address. The R/W bit signifies the type of operation that is desired. The read or write sequence will only be allowed to proceed if the internal write cycle has completed and the DS1847 responds with a zero. Read Operations: After receiving a matching address byte with the R/W bit set high, the device goes into the read mode of operation. There are three read operations: current address read, random read, and sequential address read. CURRENT ADDRESS READ The DS1847 has an internal address register that maintains the address used during the last read or write operation, incremented by one. This data is maintained as long as VCC is valid. If the most recent address was the last byte in memory, then the register resets to the first address. This address stays valid between operations as long as power is available. Once the device address is clocked in and acknowledged by the DS1847 with the R/W bit set to high, the current address data word is clocked out. The master does not respond with a zero, but does generate a STOP condition afterwards. RANDOM READ A random read requires a dummy byte write sequence to load in the data word address. Once the device and data address bytes are clocked in by the master and acknowledged by the DS1847, the master must generate another START condition. The master now initiates a current address read by sending the device address with the read/write bit set high. The DS1847 will acknowledge the device address and serially clocks out the data byte. SEQUENTIAL ADDRESS READ Sequential reads are initiated by either a current address read or a random address read. After the master receives the first data byte, the master responds with an acknowledge. As long as the DS1847 receives this acknowledge after a byte is read, the master may clock out additional data words from the DS1847. After reaching address FFh, it resets to address 00h. The sequential read operation is terminated when the master initiates a stop condition. The master does not respond with a zero. For a more detailed description of 2-wire theory of operation, refer to the next section. |
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