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24AA64-E/P Datasheet(PDF) 9 Page - Microchip Technology |
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24AA64-E/P Datasheet(HTML) 9 Page - Microchip Technology |
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9 / 24 page  2002 Microchip Technology Inc. DS21189F-page 9 24AA64/24LC64 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 com- mand has been issued from the master, the device ini- tiates the internally timed write cycle. ACK polling can be initiated immediately. This involves the master send- ing 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, then no ACK will be returned. If no ACK is returned, then the START bit and control byte must be re-sent. If the cycle is complete, then the device will return the ACK and the master can then pro- ceed with the next read or write command. See Figure 5-1 for flow diagram. FIGURE 5-1: ACKNOWLEDGE POLLING FLOW 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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