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24AA00T-ISN Datasheet(PDF) 7 Page - Microchip Technology |
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24AA00T-ISN Datasheet(HTML) 7 Page - Microchip Technology |
7 / 18 page 2003 Microchip Technology Inc. DS21178D-page 7 24AA00/24LC00/24C00 7.0 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. ACK polling can 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, 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 proceed with the next Read or Write command. See Figure 7-1 for flow diagram. FIGURE 7-1: ACKNOWLEDGE POLLING FLOW FIGURE 7-2: BYTE WRITE 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 S P BUS ACTIVITY MASTER SDA LINE BUS ACTIVITY S T A R T S T O P CONTROL BYTE WORD ADDRESS DATA A C K A C K A C K 10 X 10 X XX X = Don’t Care Bit XX X 0 |
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