SH7080_09 Datasheet, PDF (894/1622 Pages) Renesas Technology Corp – Renesas 32-Bit RISC Microcomputer SuperH RISC engine Family

Section 16 Serial Communication Interface with FIFO (SCIF)
Figure 16.3 shows a sample flowchart for initializing the SCIF.
Start of initialization
Clear TE and RE bits in SCSCR to 0
Set TFRST and RFRST bits
in SCFCR to 1
After reading BRK, DR, and ER flags
in SCFSR, and each flag in SCLSR,
write 0 to clear them
Set CKE1 and CKE0 bits
in SCSCR (leaving TE, RE, TIE,
[1]
and RIE bits cleared to 0)
Set data transfer format in SCSMR _[2]
Set value in SCBRR
[3]
Wait
No
1-bit interval elapsed?
Yes
Set RTRG1-0 and TTRG1-0
and MCE bits in SCFCR,
and clear TFRST and RFRST bits to 0
Set PFC for external pins to be used
(SCK, TXD, RXD, CTS, and RTS)
[4]
Set TE and RE bits in SCSCR to 1, _[5]
and set TIE, RIE, and REIE bits
End of initialization
[1] Set the clock selection in SCSCR.
Be sure to clear bits TIE, RIE, TE,
and RE to 0.
[2] Set the data transfer format in
SCSMR.
[3] Write a value corresponding to the
bit rate into SCBRR. (Not
necessary if an external clock is
used.)
[4] Make appropriate settings in the
PFC for the external pins to be used.
[5] Wait at least one bit interval, then
set the TE bit or RE bit in SCSCR
to 1. Also set the RIE, REIE, and
TIE bits.
Setting the TE bit enables the TXD
and RXD pins to be used.
When transmitting, the SCIF will go
to the mark state; when receiving,
it will go to the idle state, waiting for
a start bit.
Figure 16.3 Sample Flowchart for SCIF Initialization
Rev. 4.00 Dec. 15, 2009 Page 834 of 1558
REJ09B0181-0400