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전자부품 데이터시트 검색엔진 |
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전자부품 데이터시트 검색엔진 |
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AT90SCR100 데이터시트(PDF) 317 Page - ATMEL Corporation |
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AT90SCR100 데이터시트(HTML) 317 Page - ATMEL Corporation |
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317 / 433 page  317 TPR0327AY–SMS–30Jan09 AT90SCR100 using the 2-wire Serial Bus clock as a clock source. The part will then wake up from sleep and the TWI will hold the SCL clock low during the wake up and until the TWINT Flag is cleared (by writing it to one). Further data reception will be carried out as normal, with the AVR clocks run- ning as normal. Observe that if the AVR is set up with a long start-up time, the SCL line may be held low for a long time, blocking other data transmissions. theTWI Serial Interface Data Register – TWDR does not reflect the last byte pres- ent on the bus when waking up from these Sleep modes. Caution ! Table 22-4. Status Codes for Slave Receiver Mode Status Code (TWSR) Prescaler Bits are 0 Status of the 2-wire Serial Bus and 2-wire Serial Interface Hard- ware Application Software Response Next Action Taken by TWI Hardware To/from TWDR To TWCR STA STO TWIN T TWE A 0x60 Own SLA+W has been received; ACK has been returned No TWDR action or No TWDR action X X 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 0x68 Arbitration lost in SLA+R/W as Master; own SLA+W has been received; ACK has been returned No TWDR action or No TWDR action X X 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 0x70 General call address has been received; ACK has been returned No TWDR action or No TWDR action X X 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 0x78 Arbitration lost in SLA+R/W as Master; General call address has been received; ACK has been returned No TWDR action or No TWDR action X X 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 0x80 Previously addressed with own SLA+W; data has been received; ACK has been returned Read data byte or Read data byte X X 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 0x88 Previously addressed with own SLA+W; data has been received; NOT ACK has been returned Read data byte or Read data byte or Read data byte or Read data byte 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 |
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