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ATmega48 Datasheet(PDF) 220 Page - ATMEL Corporation |
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ATmega48 Datasheet(HTML) 220 Page - ATMEL Corporation |
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220 / 340 page  220 7530H–AVR–02/09 ATmega48/88/168 Automotive After a repeated START condition (state 0x10) the 2-wire Serial Interface can access the same Slave again, or a new Slave without transmitting a STOP condition. Repeated START enables the Master to switch between Slaves, Master Transmitter mode and Master Receiver mode with- out losing control of the bus. Table 19-3. Status codes for Master Transmitter Mode Status Code (TWSR) Prescaler Bits are 0 Status of the 2-wire Se- rial Bus and 2-wire Seri- al Interface Hardware Application Software Response Next Action Taken by TWI Hardware To/from TWDR To TWCR ST A ST O TWI NT TW EA 0x08 A START condition has been transmitted Load SLA+W 0 0 1 X SLA+W will be transmitted; ACK or NOT ACK will be received 0x10 A repeated START condition has been transmitted Load SLA+W or Load SLA+R 0 0 0 0 1 1 X X SLA+W will be transmitted; ACK or NOT ACK will be received SLA+R will be transmitted; Logic will switch to Master Receiver mode 0x18 SLA+W has been transmitted; ACK has been received Load data byte or No TWDR ac- tion or No TWDR ac- tion or No TWDR ac- tion 0 1 0 1 0 0 1 1 1 1 1 1 X X X X Data byte will be transmitted and ACK or NOT ACK will be received Repeated START will be transmitted STOP condition will be transmitted and TWSTO Flag will be reset STOP condition followed by a START con- dition will be transmitted and TWSTO Flag will be reset 0x20 SLA+W has been transmitted; NOT ACK has been re- ceived Load data byte or No TWDR ac- tion or No TWDR ac- tion or No TWDR ac- tion 0 1 0 1 0 0 1 1 1 1 1 1 X X X X Data byte will be transmitted and ACK or NOT ACK will be received Repeated START will be transmitted STOP condition will be transmitted and TWSTO Flag will be reset STOP condition followed by a START con- dition will be transmitted and TWSTO Flag will be reset 0x28 Data byte has been transmitted; ACK has been received Load data byte or No TWDR ac- tion or No TWDR ac- tion or No TWDR ac- tion 0 1 0 1 0 0 1 1 1 1 1 1 X X X X Data byte will be transmitted and ACK or NOT ACK will be received Repeated START will be transmitted STOP condition will be transmitted and TWSTO Flag will be reset STOP condition followed by a START con- dition will be transmitted and TWSTO Flag will be reset 0x30 Data byte has been transmitted; NOT ACK has been re- ceived Load data byte or No TWDR ac- tion or No TWDR ac- tion or No TWDR ac- tion 0 1 0 1 0 0 1 1 1 1 1 1 X X X X Data byte will be transmitted and ACK or NOT ACK will be received Repeated START will be transmitted STOP condition will be transmitted and TWSTO Flag will be reset STOP condition followed by a START con- dition will be transmitted and TWSTO Flag will be reset 0x38 Arbitration lost in SLA+W or data bytes No TWDR ac- tion or No TWDR ac- tion 0 1 0 0 1 1 X X 2-wire Serial Bus will be released and not addressed Slave mode entered A START condition will be transmitted when the bus becomes free |
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