Datasheet

95
AT89C51IC2
4301D–8051–02/08
Table 70. Status in slave receiver mode
Status
Code
(SSCS)
Status of the 2-wire bus and
2-wire hardware
Application Software Response
Next Action Taken By 2-wire Software
To/from SSDAT To SSCON
STA STO SI AA
60h
Own SLA+W has been
received; ACK has been
returned
No SSDAT action or
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 or
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
70h
General call address has been
received; ACK has been
returned
No SSDAT action or
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 or
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
No SSDAT action or
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
88h
Previously addressed with
own SLA+W; data has been
received; NOT ACK has been
returned
Read data byte or
Read data byte or
Read data byte or
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 recognised; GCA will be recognised if
GC=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 recognised; GCA will be recognised if
GC=logic 1. A START condition will be
transmitted when the bus becomes free
90h
Previously addressed with
general call; data has been
received; ACK has been
returned
Read data byte or
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