Renesas SH7781 - Manual (Page 1171)

22. Serial I/O with FIFO (SIOF)
Rev.1.00 Jan. 10, 2008 Page 1141 of 1658
REJ09B0261-0100
(3) Transmission in Slave Mode
Figure 22.11 shows an example of settings and operation for slave mode transmission.
Start
End
Set the TXE bit in SICTR to 1
Set SITDR
Clear the TXE bit in SICTR to 0
TDREQ = 1
Transfer ended?
No
Yes
No
Yes
No.
1
2
3
4
6
Flowchart SIOF Settings SIOF Operation
Set to enable transmission
Issue transmit transfer
request to enable
transmission when frame
synchronous signal is
input
Set transmit data
Transmit SITDR from SIOF_TXD
synchronously with SIOF_SYNC
5 Transmit
Set to disable transmission End transmission
Set SIMDR, SISCR, SITDAR,
SIRDAR, SICDAR, SITCR,
and SIFCTR
Set operating mode, serial clock, slot
positions for transmit/receive data, slot
position for control data, and FIFO
request threshold value
Figure 22.11 Example of Transmit Operation in Slave Mode