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전자부품 데이터시트 검색엔진 |
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전자부품 데이터시트 검색엔진 |
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ATmega328P 데이터시트(PDF) 232 Page - ATMEL Corporation |
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ATmega328P 데이터시트(HTML) 232 Page - ATMEL Corporation |
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232 / 448 page  232 8161D–AVR–10/09 ATmega48PA/88PA/168PA/328P the Master to switch between Slaves, Master Transmitter mode and Master Receiver mode with- out losing control over the bus. Table 21-3. Status codes for Master Receiver Mode Status Code (TWSR) Prescaler Bits are 0 Status of the 2-wire Serial Bus and 2-wire Serial Interface Hardware Application Software Response Next Action Taken by TWI Hardware To/from TWDR To TWCR STA STO TWIN T TWE A 0x08 A START condition has been transmitted Load SLA+R 0 0 1 X SLA+R will be transmitted ACK or NOT ACK will be received 0x10 A repeated START condition has been transmitted Load SLA+R or Load SLA+W 0 0 0 0 1 1 X X SLA+R will be transmitted ACK or NOT ACK will be received SLA+W will be transmitted Logic will switch to Master Transmitter mode 0x38 Arbitration lost in SLA+R or NOT ACK bit No TWDR action or No TWDR action 0 1 0 0 1 1 X X 2-wire Serial Bus will be released and not addressed Slave mode will be entered A START condition will be transmitted when the bus becomes free 0x40 SLA+R has been transmitted; ACK has been received No TWDR action or No TWDR action 0 0 0 0 1 1 0 1 Data byte will be received and NOT ACK will be returned Data byte will be received and ACK will be returned 0x48 SLA+R has been transmitted; NOT ACK has been received No TWDR action or No TWDR action or No TWDR action 1 0 1 0 1 1 1 1 1 X X X Repeated START will be transmitted STOP condition will be transmitted and TWSTO Flag will be reset STOP condition followed by a START condition will be transmitted and TWSTO Flag will be reset 0x50 Data byte has been received; ACK has been returned Read data byte or Read data byte 0 0 0 0 1 1 0 1 Data byte will be received and NOT ACK will be returned Data byte will be received and ACK will be returned 0x58 Data byte has been received; NOT ACK has been returned Read data byte or Read data byte or Read data byte 1 0 1 0 1 1 1 1 1 X X X Repeated START will be transmitted STOP condition will be transmitted and TWSTO Flag will be reset STOP condition followed by a START condition will be transmitted and TWSTO Flag will be reset |
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