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ATmega16HVB 数据表(PDF) 170 Page - ATMEL Corporation |
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ATmega16HVB 数据表(HTML) 170 Page - ATMEL Corporation |
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170 / 273 page  170 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 of the bus. TWCR TWINT TWEA TWSTA TWSTO TWWC TWEN – TWIE Value 1 X1 0 X1 0 X Table 27-2. Status Codes for Master Transmitter 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+W X 0 1 X SLA+W will be transmitted; ACK or NOT ACK will be received 0x10 A repeated START condition has been transmitted Load SLA+W or Load SLA+R X X 0 0 1 1 X X SLA+W will be transmitted; ACK or NOT ACK will be received SLA+R will be transmitted; Logic will switch to Master Receiver mode 0x18 SLA+W has been transmitted; ACK has been received Load data byte or No TWDR action or No TWDR action or No TWDR action 0 1 0 1 0 0 1 1 1 1 1 1 X X X X Data byte will be transmitted and ACK or NOT ACK will be received 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 0x20 SLA+W has been transmitted; NOT ACK has been received Load data byte or No TWDR action or No TWDR action or No TWDR action 0 1 0 1 0 0 1 1 1 1 1 1 X X X X Data byte will be transmitted and ACK or NOT ACK will be received 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 0x28 Data byte has been transmit- ted; ACK has been received Load data byte or No TWDR action or No TWDR action or No TWDR action 0 1 0 1 0 0 1 1 1 1 1 1 X X X X Data byte will be transmitted and ACK or NOT ACK will be received 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 0x30 Data byte has been transmit- ted; NOT ACK has been received Load data byte or No TWDR action or No TWDR action or No TWDR action 0 1 0 1 0 0 1 1 1 1 1 1 X X X X Data byte will be transmitted and ACK or NOT ACK will be received 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 0x38 Arbitration lost in SLA+W or data bytes 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 entered A START condition will be transmitted when the bus becomes free |
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