參數(shù)資料
型號(hào)： MQ80C52CXXX-12:R
廠商： ATMEL CORP
元件分類： 微控制器/微處理器
英文描述： 8-BIT, MROM, 12 MHz, MICROCONTROLLER, CQFP44
封裝： CERAMIC, QFP-44
文件頁數(shù)： 143/170頁
文件大?。?/td> 25028K
227
8272E–AVR–04/2013
ATmega164A/PA/324A/PA/644A/PA/1284/P
enables the Master to switch between Slaves, Master Transmitter mode and Master Receiver
mode without losing control over the bus.
Table 21-3.
Status codes for Master Receiver mode.
Status Code
(TWSR)
Prescaler Bits
are 0
Status of the two-wire Serial Bus
and two-wire Serial Interface
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
相關(guān)PDF資料
PDF描述
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