AT89C51SND2C_14 Datasheet, PDF (190/242 Pages) ATMEL Corporation – Bass, Medium, and Treble Control (31 Steps)

Table 21-2. Status for Master Transmitter Mode
Application Software Response
Status
Code Status of the TWI Bus
SSSTA and TWI Hardware To/From SSDAT
SSSTA
To SSCON
SSSTO SSI
08h
A START condition has
been transmitted
Write SLA+W
X
0
0
A repeated START
10h condition has been
transmitted
Write SLA+W
Write SLA+R
X
0
0
X
0
0
Write data Byte
0
SLA+W has been
No SSDAT action
1
18h transmitted; ACK has No SSDAT action
0
been received
No SSDAT action
1
0
0
0
0
1
0
1
0
Write data Byte
0
SLA+W has been
No SSDAT action
1
20h transmitted; NOT ACK No SSDAT action
0
has been received
No SSDAT action
1
0
0
0
0
1
0
1
0
Write data Byte
0
Data Byte has been No SSDAT action
1
28h transmitted; ACK has _{No SSDAT action}
0
been received
No SSDAT action
1
0
0
0
0
1
0
1
0
Write data Byte
0
Data Byte has been ^{No SSDAT action}
1
30h transmitted; NOT ACK No SSDAT action
0
has been received
No SSDAT action
1
0
0
0
0
1
0
1
0
No SSDAT action
0
38h
Arbitration lost in
SLA+W or data Bytes
No SSDAT action
1
0
0
0
0
SSAA Next Action Taken by TWI Hardware
X SLA+W will be transmitted.
X
SLA+W will be transmitted.
X
SLA+R will be transmitted.
Logic will switch to master receiver mode
X
Data Byte will be transmitted.
X
Repeated START will be transmitted.
X
STOP condition will be transmitted and SSSTO flag
will be reset.
X
STOP condition followed by a START condition will
be transmitted and SSSTO flag will be reset.
X
Data Byte will be transmitted.
X
Repeated START will be transmitted.
X
STOP condition will be transmitted and SSSTO flag
will be reset.
X
STOP condition followed by a START condition will
be transmitted and SSSTO flag will be reset.
X
Data Byte will be transmitted.
X
Repeated START will be transmitted.
X
STOP condition will be transmitted and SSSTO flag
will be reset.
X
STOP condition followed by a START condition will
be transmitted and SSSTO flag will be reset.
X
Data Byte will be transmitted.
X
Repeated START will be transmitted.
X
STOP condition will be transmitted and SSSTO flag
will be reset.
X
STOP condition followed by a START condition will
be transmitted and SSSTO flag will be reset.
X
TWI bus will be released and not addressed slave
mode will be entered.
X
A START condition will be transmitted when the bus
becomes free.
190 AT8xC51SND2C/MP3B
4341H–MP3–10/07