Master Receiver Mode - Texas Instruments CC253x User Manual

Operation
Status
Code Status of the
2
(Value of I C
I2CSTAT)
0x30 Data byte in
I2CDATA has
been
transmitted.
0x38 Arbitration lost
in SLA+R/W or
data bytes
2
20.1.4.2.2 I C Master Receiver Mode
To enable master receive mode, set the I2CCFG.ENS1 and the I2CCFG.STA bits. The I
2
waits until the I C bus is free. When the I
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.
Status
Code Status of the
(Value of I2C
I2CSTAT)
0x08 A START
condition has
been
transmitted.
0x10 A repeated
START
condition has
been
transmitted.
0x38 Arbitration lost
in not-ACK bit.
0x40 SLA+R has
been
transmitted;
ACK has been
received.
0x48 SLA+R has
been
transmitted;
not-ACK has
been received.
0x50 Data byte has
been received;
ACK has been
returned.
0x58 Data byte has
been received;
not-ACK has
been returned.
176
2
I C
Table 20-3. Master Transmitter Mode (continued)
Application Software Response
To I2CCFG
To or From
I2CDATA
STA STO
Data byte 0 0
or 1 0
no action
or 0 1
no action
or 1 1
no action
No action 0 0
or 1 0
no action
2
C bus is free, it generates a START condition, sends the slave
Table 20-4. Master Receiver Mode
Application Software Response
To I2CCFG
To or From
I2CDATA
STA STO
Load SLA+R X 0
Load SLA+R X 0
or X 0
load SLA+W
No action 0 0
or 1 0
no action
No action 0 0
or 0 0
no action
No action 1 0
or 0 1
no action
or 1 1
no action
Read data byte 0 0
or 0 0
read data byte
Read data byte 1 0
or 0 1
read data byte
or 1 1
read data byte
Copyright © 2009–2014, Texas Instruments Incorporated
Next Action Taken by I
SI AA
0 X Data byte is transmitted; ACK is received.
0 X Repeated START is transmitted.
0 X STOP condition is transmitted; STO flag is reset.
0 X STOP condition followed by a START condition is
transmitted; STO flag is reset.
2
0 X I C bus is released; not-addressed slave is entered.
0 X A START condition is transmitted when the bus
becomes free.
Next Action Taken by I
SI AA
0 X SLA+R is transmitted.
ACK is received.
0 X As above
0 X SLA+W is transmitted; I
mode.
2
0 X I C bus is released; I
0 X A start condition is transmitted when the bus
becomes free.
0 0 Data byte is received; not-ACK is returned.
0 1 Data byte is received; ACK is returned.
0 X Repeated START condition is transmitted.
0 X STOP condition is transmitted; STO flag is reset.
0 X STOP condition followed by a START condition is
transmitted; STO flag is reset.
0 0 Data byte is received; not-ACK is returned.
0 1 Data byte is received; ACK is returned
0 X Repeated START condition is transmitted.
0 X STOP condition is transmitted; STO flag is reset.
0 X STOP condition followed by a START condition is
transmitted; STO flag is reset.
SWRU191F – April 2009 – Revised April 2014
www.ti.com
2
C Hardware
2
C module then
2
C Hardware
2
C is switched to MST-TRX
2
C enters slave mode.
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