User manual

Rev. 1.00, 05/04, page 328 of 544
13.4.6 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 13.23 shows the sample flowchart for the operations in slave transmit mode.
End
Write transmit data in ICDR
Clear IRIC in ICCR
Clear IRIC in ICCR
Clear ACKE to 0 in ICCR
(ACKB=0 clear)
Clear IRIC in ICCR
Read IRIC in ICCR
Read ACKB in ICSR
Set TRS = 0 in ICCR
Read ICDR
Read IRIC in ICCR
IRIC = 1?
Yes
Yes
No
No
IRIC = 1?
Yes
No
[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 recieve mode, the mode changes to slave transmit mode.
[8] Set slave receive mode.
[6] Read IRIC in ICCR
[7] Clear acknowledge bit data
[9] Dummy read (to release the SCL line).
[10] Wait for stop condition
[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.
Slave transmit mode
End
of transmission
(ACKB = 1)?
Clear IRIC in ICCR
Figure 13.23 Sample Flowchart for Slave Transmit Mode