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I2Cn_STATEDescription
I2Cn_IF
Required
Response
interaction
START
START will be sent when bus becomes idle
-
Arbitration lost
ARBLOST interrupt
None
flag
START
START will be sent when bus becomes idle
The I2Cn_STATE register can be used to determine which state the I C module and the I2C bus are in
at a given time. The register consists of the STATE bit-field, which shows which state the I C module is
the bus is busy or idle, and whether the bus is held by this I C module waiting for a software response.
cleared, the I C module is not a part of any ongoing transmission. The remaining status bits in the
Table 15.6. I C STATE Values
15.3.8 Bus States
2
2
at in any ongoing transmission, and a set of single-bits, which reveal the transmission mode, whether
2
The possible values of the STATE field are summarized in Table 15.6 (p. 157) . When this field is
2
I2Cn_STATE register are listed in Table 15.7 (p. 157) .
2
Mode
IDLE
WAIT
START
ADDR
ADDRACK
DATA
DATAACK
Value
0
1
2
3
4
5
6
Description
No transmission is being performed by this module.
Waiting for idle. Will send a start condition as soon as the bus is idle.
Start being transmitted
Address being transmitted or has been received
Address ACK/NACK being transmitted or received
Data being transmitted or received
Data ACK/NACK being transmitted or received
Table 15.7. I C Transmission Status
2
Set when the bus is held by this I C module because an action is required by
Bit
BUSY
MASTER
TRANSMITTER
BUSHOLD
NACK
Description
Set whenever there is activity on the bus. Whether or not this module is
responsible for the activity cannot be determined by this byte.
Set when operating as a master. Cleared at all other times.
Set when operating as a transmitter; either a master transmitter or a slave
transmitter. Cleared at all other times
2
software.
Only valid when bus is held and STATE is ADDRACK or DATAACK. In that case
it is set if a NACK was received. In all other cases, the bit is cleared.
I2Cn_STATE reflects the internal state of the I C module, and therefore only held constant
Note
2
The I C module operates in master mode by default. To enable slave operation, i.e. to allow the device to
be addressed as an I C slave, the SLAVE bit in I2Cn_CTRL must be set. In this case the slave operates
as long as the bus is held, i.e. as long as BUSHOLD in I2Cn_STATUS is set.
15.3.9 Slave Operation
2
2
in a mixed mode, both capable of starting transmissions as a master, and being addressed as a slave.
2011-04-12 - d0001_Rev1.10
157
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