At8xc51snd1c – Rainbow Electronics AT89C51SND1C User Manual
Page 169
169
AT8xC51SND1C
4109E–8051–06/03
Table 138. Status for Slave Receiver Mode with Own Slave 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
60h
Own SLA+W 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.
68h
Arbitration lost in
SLA+R/W as master;
own SLA+W 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.
80h
Previously addressed
with own SLA+W; 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.
88h
Previously addressed
with own SLA+W; 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.