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AT90SCR100 Datasheet(PDF) 310 Page - ATMEL Corporation |
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AT90SCR100 Datasheet(HTML) 310 Page - ATMEL Corporation |
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310 / 433 page  310 TPR0327AY–SMS–30Jan09 AT90SCR100 the access will be discarded, and the Write Collision bit (TWWC) will be set in the TWCR Regis- ter. After updating TWDR, the TWINT bit should be cleared (by writing it to one) to continue the transfer. This is accomplished by writing the following value to TWCR: This scheme is repeated until the last byte has been sent and the transfer is ended by generat- ing a STOP condition or a repeated START condition. A STOP condition is generated by writing the following value to TWCR: A REPEATED START condition is generated by writing the following value to TWCR: 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. TWCR TWINT TWEA TWSTA TWSTO TWWC TWEN – TWIE value 1 X0 0 X1 0 X TWCR TWINT TWEA TWSTA TWSTO TWWC TWEN – TWIE value 1 X0 1 X1 0 X TWCR TWINT TWEA TWSTA TWSTO TWWC TWEN – TWIE value 1 X1 0 X1 0 X Table 22-2. Status codes for Master Transmitter 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+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 action or No TWDR action or No TWDR action 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 condition will be transmitted and TWSTO Flag will be reset 0x20 SLA+W has been transmitted; NOT ACK has been received Load data byte or No TWDR action or No TWDR action or No TWDR action 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 condition will be transmitted and TWSTO Flag will be reset |
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