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AT90USB646 Datasheet(PDF) 237 Page - ATMEL Corporation |
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AT90USB646 Datasheet(HTML) 237 Page - ATMEL Corporation |
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237 / 456 page  237 7593L–AVR–09/12 AT90USB64/128 Table 21-6. Status codes for Slave Transmitter mode. Status code (TWSR) pr- escaler 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 TWINT TWEA 0xA8 Own SLA+R has been received; ACK has been returned Load data byte or Load data byte X X 0 0 1 1 0 1 Last data byte will be transmitted and NOT ACK should be received Data byte will be transmitted and ACK should be re- ceived 0xB0 Arbitration lost in SLA+R/W as Master; own SLA+R has been re- ceived; ACK has been returned Load data byte or Load data byte X X 0 0 1 1 0 1 Last data byte will be transmitted and NOT ACK should be received Data byte will be transmitted and ACK should be re- ceived 0xB8 Data byte in TWDR has been transmitted; ACK has been re- ceived Load data byte or Load data byte X X 0 0 1 1 0 1 Last data byte will be transmitted and NOT ACK should be received Data byte will be transmitted and ACK should be re- ceived 0xC0 Data byte in TWDR has been transmitted; NOT ACK has been received No TWDR action or No TWDR action or No TWDR action or No TWDR action 0 0 1 1 0 0 0 0 1 1 1 1 0 1 0 1 Switched to the not addressed Slave mode; no recognition of own SLA or GCA Switched to the not addressed Slave mode; own SLA will be recognized; GCA will be recognized if TWGCE = “1” Switched to the not addressed Slave mode; no recognition of own SLA or GCA; a START condition will be transmitted when the bus be- comes free Switched to the not addressed Slave mode; own SLA will be recognized; GCA will be recognized if TWGCE = “1”; a START condition will be transmitted when the bus be- comes free 0xC8 Last data byte in TWDR has been transmitted (TWEA = “0”); ACK has been received No TWDR action or No TWDR action or No TWDR action or No TWDR action 0 0 1 1 0 0 0 0 1 1 1 1 0 1 0 1 Switched to the not addressed Slave mode; no recognition of own SLA or GCA Switched to the not addressed Slave mode; own SLA will be recognized; GCA will be recognized if TWGCE = “1” Switched to the not addressed Slave mode; no recognition of own SLA or GCA; a START condition will be transmitted when the bus be- comes free Switched to the not addressed Slave mode; own SLA will be recognized; GCA will be recognized if TWGCE = “1”; a START condition will be transmitted when the bus be- comes free |
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