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24LC01BH Datasheet(PDF) 7 Page - Microchip Technology |
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24LC01BH Datasheet(HTML) 7 Page - Microchip Technology |
7 / 30 page © 2008 Microchip Technology Inc. DS22104A-page 7 24AA01H/24LC01BH 4.6 Device Addressing A control byte is the first byte received following the Start condition from the master device. The control byte consists of a four-bit control code. For the 24XX01H, this is set as ‘1010’ binary for read and write opera- tions. The next three bits of the control byte are “don’t cares” for the 24XX01H. The last bit of the control byte defines the operation to be performed. When set to ‘1’, a read operation is selected. When set to ‘0’, a write operation is selected. Following the Start condition, the 24XX01H monitors the SDA bus, checking the device type identifier being transmitted. Upon receiving a ‘1010’ code, the slave device outputs an Acknowledge signal on the SDA line. Depending on the state of the R/W bit, the 24XX01H will select a read or write operation. FIGURE 4-2: CONTROL BYTE ALLOCATION Operation Control Code Block Select R/W Read 1010 Block Address 1 Write 1010 Block Address 0 10 1 0 xx x R/W ACK Start Bit Read/Write Bit x = “don’t care” S Slave Address Acknowledge Bit Control Code Block Select Bits |
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