HD64F3687GHV Datasheet, PDF (350/566 Pages) Renesas Technology Corp – Old Company Name in Catalogs and Other Documents

Section 16 Serial Communication Interface 3 (SCI3)
16.5.5 Simultaneous Serial Data Transmission and Reception
Figure 16.14 shows a sample flowchart for simultaneous serial transmit and receive operations.
The following procedure should be used for simultaneous serial data transmit and receive
operations. To switch from transmit mode to simultaneous transmit and receive mode, after
checking that the SCI3 has finished transmission and the TDRE and TEND flags are set to 1, clear
TE to 0. Then simultaneously set TE and RE to 1 with a single instruction. To switch from receive
mode to simultaneous transmit and receive mode, after checking that the SCI3 has finished
reception, clear RE to 0. Then after checking that the RDRF and receive error flags (OER, FER,
and PER) are cleared to 0, simultaneously set TE and RE to 1 with a single instruction.
Rev. 3.00 Sep. 10, 2007 Page 316 of 528
REJ09B0216-0300