Rev. 2.00, 09/03, page 425 of 690
No
Yes
Yes
No
Yes
No
Wait
[1] Set the receive trigger number and
transmit trigger number in SCFCR.
[2] Reset the receive FIFO and transmit
FIFO.
[3] Write transmit data to SCFTDR, and
if there is receive data in the FIFO,
read receive data until there is less
than the receive trigger setting number,
read the TDFE and RDF bits in SCSSR,
and if 1, clear to 0.
[4] Wait for one bit interval.
[5] Transmission/reception is started when
the TE and RE bits in SCSCR are set
to 1. The TE and RE bits must be set
simultaneously.
[6] After the end of transmission/reception,
clear the TE and RE bits to 0.
Start of simultaneous
transmission/reception
Set receive trigger number in RTRG1
and RTRG0 in SCFCR, and set transmit
trigger number in TTRG1 and TTRG0
Set TFRST and RFRST bits in
SCFCR to 1
Clear TFRST and RFRST bits in
SCFCR to 0
Write transmit data to SCFTDR
Read TDFE and RDF bits in SCSSR
TDFE =1?
RDF =1?
Write 0 to TDFE and RDF bits in
SCSSR after reading 1 from them
1-bit interval elapsed?
Set TE and RE bits in SCSCR
simultaneously
When using transmit FIFO data
interrupt, set TIE bit to 1
When using receive FIFO data
interrupt, set RIE bit to 1
TDFE =1?
RDF =1?
Read receive trigger number of
receive data bytes from SCFRDR
End of
transmission/reception
Clear TE and RE bits in SCSCR to 0
[1]
[2]
[3]
[4]
[5]
[6]
Figure 16.16 Sample Simultaneous Serial Transmission and Reception Flowchart (2)
(Second and Subsequent Transfer)
Summary of Contents for SH7705
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