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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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ATmega32HVB датащи(PDF) 173 Page - ATMEL Corporation |
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ATmega32HVB датащи(HTML) 173 Page - ATMEL Corporation |
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173 / 273 page  173 8042A–AVR–07/09 ATmega16HVB/32HVB A REPEATED START condition is generated by writing the following value to TWCR: After a repeated START condition (state 0x10) the Two-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 without losing control over the bus. 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 27-3. Status Codes for Master Receiver Mode Status Code (TWSR) Prescaler Bits are 0 Status of the Two-wire Serial Bus and Two-wire Serial Inter- face Hardware Application Software Response Next Action Taken by TWI Hardware To/from TWDR To TWCR STA STO TWINT TWEA 0x08 A START condition has been transmitted Load SLA+R X 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 X X 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 Two-wire Serial Bus will be released and not ad- dressed 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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