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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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ATmega128 датащи(PDF) 219 Page - ATMEL Corporation |
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ATmega128 датащи(HTML) 219 Page - ATMEL Corporation |
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219 / 386 page  219 2467S–AVR–07/09 ATmega128 Slave Receiver Mode In the Slave Receiver mode, a number of data bytes are received from a master transmitter (see Figure 100). All the status codes mentioned in this section assume that the prescaler bits are zero or are masked to zero. Figure 100. Data Transfer in Slave Receiver Mode To initiate the Slave Receiver mode, TWAR and TWCR must be initialized as follows: Table 89. 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 $08 A START condition has been transmitted Load SLA+R 0 0 1 X SLA+R will be transmitted ACK or NOT ACK will be received $10 A repeated START condition has been transmitted Load SLA+R or Load SLA+W 0 0 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 $38 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 addressed slave mode will be entered A START condition will be transmitted when the bus becomes free $40 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 $48 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 $50 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 $58 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 TWAR TWA6 TWA5 TWA4 TWA3 TWA2 TWA1 TWA0 TWGCE value Device’s Own Slave Address Device 3 Device n SDA SCL ........ R1 R2 V CC Device 2 MASTER TRANSMITTER Device 1 SLAVE RECEIVER |
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