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Operation
Table 20-3. Master Transmitter Mode (continued)
Status Application Software Response
Code
To I2CCFG
Status of the
(Value of Next Action Taken by I
2
C Hardware
I
2
C
To/From I2CDATA
I2CSTAT.
STA STO SI AA
STAC)
0x30 Data byte in Data byte 0 0 0 X Data byte is transmitted; ACK is received.
I2CDATA has
or 1 0 0 X Repeated START is transmitted.
been
no action
transmitted.
or 0 1 0 X STOP condition is transmitted; STO flag is reset.
no action
or 1 1 0 X STOP condition followed by a START condition is
no action transmitted; STO flag is reset.
0x38 Arbitration lost No action 0 0 0 X I
2
C bus is released; not-addressed slave is entered.
in SLA+R/W or
or 1 0 0 X A START condition is transmitted when the bus
data bytes
no action becomes free.
20.1.4.2.2 I
2
C Master Receiver Mode
To enable master receive mode, set the I2CCFG.ENS1 and the I2CCFG.STA bits. The I
2
C module then
waits until the I
2
C bus is free. When the I
2
C bus is free, it generates a START condition, sends the slave
address, and transfers a receive direction bit. It then generates an interrupt, and the first byte is received.
Table 20-4 provides more details regarding the master receiver operation.
Table 20-4. Master Receiver Mode
Status Application Software Response
Code
To I2CCFG
Status of the
(Value of Next Action Taken by I
2
C Hardware
I2C
To/From I2CDATA
I2CSTAT.
STA STO SI AA
STAC)
0x08 A START Load SLA+R X 0 0 X SLA+R is transmitted.
condition has ACK is received.
been
transmitted.
0x10 A repeated Load SLA+R X 0 0 X As above
START
or X 0 0 X SLA+W is transmitted; I
2
C is switched to MST/TRX
condition has
load SLA+W mode.
been
transmitted.
0x38 Arbitration lost No action 0 0 0 X I
2
C bus is released; I
2
C enters slave mode.
in not-ACK bit.
or 1 0 0 X A start condition is transmitted when the bus
no action becomes free.
0x40 SLA+R has No action 0 0 0 0 Data byte is received; not-ACK is returned.
been
or 0 0 0 1 Data byte is received; ACK is returned.
transmitted;
no action
ACK has been
received.
0x48 SLA+R has No action 1 0 0 X Repeated START condition is transmitted.
been
or 0 1 0 X STOP condition is transmitted; STO flag is reset.
transmitted;
no action
not-ACK has
or 1 1 0 X STOP condition followed by a START condition is
been received.
no action transmitted; STO flag is reset.
0x50 Data byte has Read data byte 0 0 0 0 Data byte is received; not-ACK is returned.
been received;
or 0 0 0 1 Data byte is received; ACK is returned
ACK has been
read data byte
returned.
185
SWRU191C–April 2009–Revised January 2012
I
2
C
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