AT89C5132
Table 23. Status for Slave Receiver Mode with General Call Address
Application Software Response
Status
Code Status of the TWI Bus
To SSCON
SSSTA and TWI Hardware
To/From SSDAT
No SSDAT action
No SSDAT action
SSSTA
SSSTO
SSI
0
SSAA Next Action Taken by TWI Hardware
General call address
has been received;
70h
X
X
0
0
0
1
Data Byte will be received and NOT ACK will be
returned.
ACK has been
0
Data Byte will be received and ACK will be returned.
returned
Arbitration lost in
SLA+R/W as master;
No SSDAT action
No SSDAT action
X
X
0
0
0
0
0
1
Data Byte will be received and NOT ACK will be
returned.
general call address
78h
has been received;
ACK has been
returned
Data Byte will be received and ACK will be returned.
Previously addressed
X
X
0
0
0
0
0
1
Data Byte will be received and NOT ACK will be
returned.
with general call; data Read data Byte
has been received;
90h
ACK has been
returned
Read data Byte
Data Byte will be received and ACK will be returned.
Switched to the not addressed slave mode; no
recognition of own SLA or GCA.
Read data Byte
Read data Byte
0
0
0
0
0
0
0
1
Switched to the not addressed slave mode; own
SLA will be recognized; GCA will be recognized if
SSGC = logic 1.
Previously addressed
with general call; data
has been received;
NOT ACK has been
returned
Switched to the not addressed slave mode; no
recognition of own SLA or GCA. A START condition
will be transmitted when the bus becomes free.
98h
Read data Byte
Read data Byte
1
1
0
0
0
0
0
1
Switched to the not addressed slave mode; own
SLA will be recognized; GCA will be recognized if
SSGC = logic 1. A START condition will be
transmitted when the bus becomes free.
Switched to the not addressed slave mode; no
recognition of own SLA or GCA.
No SSDAT action
No SSDAT action
0
0
0
0
0
0
0
1
Switched to the not addressed slave mode; own
SLA will be recognized; GCA will be recognized if
SSGC = logic 1.
A STOP condition or
repeated START
Switched to the not addressed slave mode; no
recognition of own SLA or GCA. A START condition
will be transmitted when the bus becomes free.
A0h
condition has been
received while still
addressed as slave
No SSDAT action
No SSDAT action
1
1
0
0
0
0
0
1
Switched to the not addressed slave mode; own
SLA will be recognized; GCA will be recognized if
SSGC = logic 1. A START condition will be
transmitted when the bus becomes free.
143
4173E–USB–09/07
ATMEL [ ATMEL ]
