AT8xC51SND2C
Table 170. Status for Slave Receiver Mode with General Call Address
Application Software Response
Status
To SSCON
SSSTO SSI
Code Status of the TWI Bus
SSSTA and TWI Hardware
To/From SSDAT
SSSTA
SSAA Next Action Taken by TWI Hardware
General call address
has been received;
ACK has been
returned
No SSDAT action
Data Byte will be received and NOT ACK will be
returned.
X
X
0
0
0
0
0
1
70h
No SSDAT action
Data Byte will be received and ACK will be returned.
Arbitration lost in
SLA+R/W as master;
general call address
has been received;
ACK has been
returned
No SSDAT action
No SSDAT action
Data Byte will be received and NOT ACK will be
returned.
X
X
0
0
0
0
0
1
Data Byte will be received and ACK will be returned.
78h
Previously addressed Read data Byte
with general call; data
Data Byte will be received and NOT ACK will be
returned.
X
X
0
0
0
0
0
1
90h
has been received;
ACK has been
returned
Read data Byte
Data Byte will be received and ACK will be returned.
Read data Byte
Read data Byte
Switched to the not addressed slave mode; no
recognition of own SLA or GCA.
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
Read data Byte
Read data Byte
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
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.
No SSDAT action
No SSDAT action
Switched to the not addressed slave mode; no
recognition of own SLA or GCA.
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
condition has been
received while still
addressed as slave
No SSDAT action
No SSDAT action
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
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.
193
4341D–MP3–04/05
ATMEL [ ATMEL ]
