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24LC08B-E/MC Datasheet(PDF) 8 Page - Microchip Technology |
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24LC08B-E/MC Datasheet(HTML) 8 Page - Microchip Technology |
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8 / 26 page  24AA08/24LC08B DS21710H-page 8 © 2008 Microchip Technology Inc. 5.0 ACKNOWLEDGE POLLING Since the device will not acknowledge during a write cycle, this can be used to determine when the cycle is complete (this feature can be used to maximize bus throughput). Once the Stop condition for a Write command has been issued from the master, the device initiates the internally-timed write cycle and ACK polling can then be initiated immediately. This involves the master sending a Start condition followed by the control byte for a Write command (R/W = 0). If the device is still busy with the write cycle, no ACK will be returned. If the cycle is complete, the device will return the ACK and the master can then proceed with the next Read or Write command. See Figure 5-1 for a flow diagram of this operation. FIGURE 5-1: ACKNOWLEDGE POLLING FLOW 6.0 WRITE PROTECTION The WP pin allows the user to write-protect the entire array (000-3FF) when the pin is tied to VCC. If the pin is tied to VSS the write protection is disabled. Send Write Command Send Stop Condition to Initiate Write Cycle Send Start Send Control Byte with R/W = 0 Did Device Acknowledge (ACK = 0)? Next Operation No Yes |
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