At8xc51snd1c – Rainbow Electronics AT89C51SND1C User Manual
Page 170
170
AT8xC51SND1C
4109E–8051–06/03
Table 139. Status for Slave Receiver Mode with General Call Address
Status
Code
SSSTA
Status of the TWI Bus
and TWI Hardware
Application Software Response
Next Action Taken by TWI Hardware
To/From SSDAT
To SSCON
SSSTA
SSSTO
SSI
SSAA
70h
General call address
has been received;
ACK has been
returned
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.
Data Byte will be received and ACK will be returned.
78h
Arbitration lost in
SLA+R/W as master;
general call address
has been received;
ACK has been
returned
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.
Data Byte will be received and ACK will be returned.
90h
Previously addressed
with general call; data
has been received;
ACK has been
returned
Read data Byte
Read data Byte
X
X
0
0
0
0
0
1
Data Byte will be received and NOT ACK will be
returned.
Data Byte will be received and ACK will be returned.
98h
Previously addressed
with general call; data
has been received;
NOT ACK has been
returned
Read data Byte
Read data Byte
Read data Byte
Read data Byte
0
0
1
1
0
0
0
0
0
0
0
0
0
1
0
1
Switched to the not addressed slave mode; no
recognition of own SLA or GCA.
Switched to the not addressed slave mode; own
SLA will be recognized; GCA will be recognized if
SSGC = logic 1.
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.
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.
A0h
A STOP condition or
repeated START
condition has been
received while still
addressed as slave
No SSDAT action
No SSDAT action
No SSDAT action
No SSDAT action
0
0
1
1
0
0
0
0
0
0
0
0
0
1
0
1
Switched to the not addressed slave mode; no
recognition of own SLA or GCA.
Switched to the not addressed slave mode; own
SLA will be recognized; GCA will be recognized if
SSGC = logic 1.
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.
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.