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AT89C51ID2-RDTIM Datasheet(PDF) 90 Page - ATMEL Corporation |
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AT89C51ID2-RDTIM Datasheet(HTML) 90 Page - ATMEL Corporation |
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90 / 159 page  90 AT89C51ID2 4289A–8051–09/03 Table 66. Status in Master Receiver Mode Status Code SSSTA Status of the Two- wire Bus and Two- wire Hardware Application software response Next Action Taken by Two-wire Hardware To/From SSDAT To SSCON SSSTA SSSTO SSI SSAA 08h A START condition has been transmitted Write SLA+R X 0 0 X SLA+R will be transmitted. 10h A repeated START condition has been transmitted Write SLA+R Write SLA+W X X 0 0 0 0 X X SLA+R will be transmitted. SLA+W will be transmitted. Logic will switch to master transmitter mode. 38h Arbitration lost in SLA+R or NOT ACK bit No SSDAT action No SSDAT action 0 1 0 0 0 0 X X Two-wire bus will be released and not addressed slave mode will be entered. A START condition will be transmitted when the bus becomes free. 40h SLA+R has been transmitted; ACK has been received No SSDAT action No SSDAT action 0 0 0 0 0 0 0 1 Data byte will be received and NOT ACK will be returned. Data byte will be received and ACK will be returned. 48h SLA+R has been transmitted; NOT ACK has been received No SSDAT action No SSDAT action No SSDAT action 1 0 1 0 1 1 0 0 0 X X X Repeated START will be transmitted. STOP condition will be transmitted and SSSTO flag will be reset. STOP condition followed by a START condition will be transmitted and SSSTO flag will be reset. 50h Data byte has been received; ACK has been returned Read data byte Read data byte 0 0 0 0 0 0 0 1 Data byte will be received and NOT ACK will be returned. Data byte will be received and ACK will be returned. 58h Data byte has been received; NOT ACK has been returned Read data byte Read data byte Read data byte 1 0 1 0 1 1 0 0 0 X X X Repeated START will be transmitted. STOP condition will be transmitted and SSSTO flag will be reset. STOP condition followed by a START condition will be transmitted and SSSTO flag will be reset. |
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