HT80C51 User Manual
Peripheral Modules – I2C Interface (SIO1)
Handshake Solutions
© Philips Electronics N.V. 2005
Page 67 of 132
application software response
to S1CON
status
code
S1STA
status of the I2C bus
and SIO1 hardware
to/from S1DAT
STA STO
SI
AA
Next action taken by SIO1 hardware
60H
Own SLA+W has been
received; ACK has been
returned
No S1DAT action or
no S1DAT action
X
X
0
0
0
0
0
1
Data byte will be received;
NOT ACK bit will be returned
Data byte will be received;
ACK bit will be returned
68H
Arbitration lost in SLA+R/W
as master; Own SLA+W
has has been received;
ACK has been returned
No S1DAT action or
no S1DAT action
X
X
0
0
0
0
0
1
Data byte will be received;
NOT ACK bit will be returned
Data byte will be received;
ACK bit will be returned
70H
General call address (00H)
has been received; ACK
has been returned
No S1DAT action or
no S1DAT action
X
X
0
0
0
0
0
1
Data byte will be received;
NOT ACK bit will be returned
Data byte will be received;
ACK bit will be returned
78H
Arbitration lost in SLA+R/W
as master; General call
address (00H) has been
received; ACK has been
returned
No S1DAT action or
no S1DAT action
X
X
0
0
0
0
0
1
Data byte will be received;
NOT ACK bit will be returned
Data byte will be received;
ACK bit will be returned
80H
Previously addressed with
own SLV address; 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;
NOT ACK bit will be returned
Data byte will be received;
ACK bit will be returned
88H
Previously addressed with
own SLA; 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 not addressed SLV mode; no recog-
nition of own SLA or General call address
Switched to not addressed SLV mode; Own SLA
will be recognized; General call address will be
recognized if S1ADR.0 = logic 1
Switched to not addressed SLV mode; no recog-
nition of own SLA or General call address. A
START condition will be transmitted when the bus
becomes free
Switched to not addressed SLV mode; Own SLA
will be recognized; General call address will be
recognized if S1ADR.0 = logic 1. A START
condition will be transmitted when the bus be-
comes 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;
NOT ACK bit will be returned
Data byte will be received;
ACK bit will be returned
98H
Previously addressed with
General Call; DATA has
been received; NOT ACK
has been returned
Read data byte or
read data byte or
0
0
0
0
0
0
0
1
Switched to not addressed SLV mode; no recog-
nition of own SLA or General call address
Switched to not addressed SLV mode; Own SLA
will be recognized; General call address will be
recognized if S1ADR.0 = logic 1
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