AT89C51ID2_0309 Datasheet, PDF (95/159 Pages) ATMEL Corporation – 8-bit Flash Microcontroller

AT89C51ID2
Table 68. Status in Slave Transmitter Mode (Continued)
Application Software Response
Status
Code
(SSCS)
Status of the 2-wire bus and
2-wire hardware
To/from SSDAT
To SSCON
STA STO SI
No SSDAT action or 0
0
0
No SSDAT action or 0
0
0
Data byte in SSDAT has been
C0h
transmitted; NOT ACK has
been received
No SSDAT action or 1
0
0
No SSDAT action
1
0
0
No SSDAT action or 0
No SSDAT action or 0
Last data byte in SSDAT has
C8h
been transmitted (AA=0); ACK
has been received
No SSDAT action or 1
0
0
0
0
0
0
No SSDAT action
1
0
0
AA Next Action Taken By 2-wire Software
Switched to the not addressed slave mode; no
0 ^{recognition of own SLA or GCA}
Switched to the not addressed slave mode; own
1
SLA will be recognised; GCA will be recognised if
GC=logic 1
Switched to the not addressed slave mode; no
0
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
1
SLA will be recognised; GCA will be recognised if
GC=logic 1. A START condition will be transmitted
when the bus becomes free
Switched to the not addressed slave mode; no
0 ^{recognition of own SLA or GCA}
Switched to the not addressed slave mode; own
1
SLA will be recognised; GCA will be recognised if
GC=logic 1
Switched to the not addressed slave mode; no
0
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
1
SLA will be recognised; GCA will be recognised if
GC=logic 1. A START condition will be transmitted
when the bus becomes free
Table 69. Miscellaneous Status
Application Software Response
Status Status of the 2-wire
Code
bus and 2-wire
(SSCS)
hardware
No relevant state
F8h
information
available; SI= 0
Bus error due to an
00h
illegal START or
STOP condition
To/from
SSDAT
To SSCON
Next Action Taken By 2-wire
STA STO SI AA Software
No SSDAT
action
No SSCON action Wait or proceed current transfer
No SSDAT
action
Only the internal hardware is
affected, no STOP condition is
0 1 0 X sent on the bus. In all cases,
the bus is released and STO is
reset.
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4289A–8051–09/03