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AT90USB646 Datasheet(PDF) 243 Page - ATMEL Corporation |
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AT90USB646 Datasheet(HTML) 243 Page - ATMEL Corporation |
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243 / 434 page  243 7593A–AVR–02/06 AT90USB64/128 Figure 20-19. Formats and States in the Slave Transmitter Mode 20.8.5 Miscellaneous States There are two status codes that do not correspond to a defined TWI state, see Table 20-7. 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 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 0xB8 Data byte in TWDR has been transmitted; ACK has been received 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 becomes 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 becomes 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 becomes 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 becomes free Table 20-6. Status Codes for Slave Transmitter Mode S SLA R A DATA A $A8 $B8 A $B0 Reception of the own slave address and one or more data bytes Last data byte transmitted. Switched to not addressed slave (TWEA = '0') Arbitration lost as master and addressed as slave n From master to slave From slave to master Any number of data bytes and their associated acknowledge bits This number (contained in TWSR) corresponds to a defined state of the Two-Wire Serial Bus. The prescaler bits are zero or masked to zero P or S DATA $C0 DATA A A $C8 P or S All 1's A |
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