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24AA01T Datasheet(PDF) 6 Page - Microchip Technology |
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24AA01T Datasheet(HTML) 6 Page - Microchip Technology |
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6 / 24 page  24AA01/24LC01B DS21711C-page 6 2003 Microchip Technology Inc. 3.6 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 24XX01, this is set as ‘1010’ binary for read and write operations. The next three bits of the control byte are ‘don’t care’s’ for the 24XX01. 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 24XX01 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 24XX01 will select a read or write operation. FIGURE 3-2: CONTROL BYTE ALLOCATION Operation Control Code Block Select R/W Read 1010 Block Address 1 Write 1010 Block Address 0 101 0 XX X R/W A START READ/WRITE SLAVE ADDRESS X = ‘Don’t care’. |
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