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Section 18 I
C Bus Interface (IIC)
18.4.6
Slave Transmit Operation
If the slave address matches to the address in the first frame (address reception frame) following
the start condition detection when the 8th bit data (R/W) is 1 (read), the TRS bit in ICCR is
automatically set to 1 and the mode changes to slave transmit mode.
Figure 18.23 shows the sample flowchart for the operations in slave transmit mode.
Slave transmit mode
Clear IRIC in ICCR
Write transmit data in ICDR
Clear IRIC in ICCR
Read IRIC in ICCR
No
IRIC = 1?
Yes
Read ACKB in ICSR
End
No
of transmission
(ACKB = 1)?
Yes
Clear IRIC in ICCR
Clear ACKE to 0 in ICCR
(ACKB=0 clear)
Set TRS = 0 in ICCR
Read ICDR
Read IRIC in ICCR
No
IRIC = 1?
Yes
Clear IRIC in ICCR
End
Figure 18.23 Sample Flowchart for Slave Transmit Mode
Rev. 1.00 Mar. 12, 2008 Page 640 of 1178
REJ09B0403-0100
[1], [2] If the slave address matches to the address in the first frame
following the start condition detection and the R/W bit is 1
in slave receive mode, the mode changes to slave transmit mode.
[3], [5] Set transmit data for the second and subsequent bytes.
[3], [4] Wait for 1 byte to be transmitted.
[4] Determine end of transfer.
[6] Clear IRIC in ICCR
[7] Clear acknowledge bit data
[8] Set slave receive mode.
[9] Dummy read (to release the SCL line).
[10] Wait for stop condition
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