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参数资料
型号： TSC80C31-25IDD
厂商： ATMEL CORP
元件分类： 微控制器/微处理器
英文描述： 8-BIT, 25 MHz, MICROCONTROLLER, PQFP44
封装： PLASTIC, QFP-44
文件页数： 24/132页
文件大小： 10886K
代理商： TSC80C31-25IDD
193
ATmega8535(L)
2502K–AVR–10/06
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
X1
0
X1
0
X
Table 76. 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
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
0
1
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
1
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
0x40
SLA+R has been transmitted;
ACK has been received
No TWDR action or
No TWDR action
0
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
1
0
1
0
1
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
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
1
0
1
0
1
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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