H8S2268_09 Datasheet, PDF (413/712 Pages) Renesas Technology Corp – Renesas 16-Bit Single-Chip Microcomputer H8S Family/H8S/2200 Series

Section 13 Serial Communication Interface (SCI)
13.6.5 Simultaneous Serial Data Transmission and Reception (Clocked Synchronous
Mode)
Figure 13.23 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 SCI 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 SCI has finished
reception, clear RE to 0. Then after checking that the RDRF and receive error flags (ORER, FER,
and PER) are cleared to 0, simultaneously set TE and RE to 1 with a single instruction.
Rev. 5.00 Sep. 01, 2009 Page 361 of 656
REJ09B0071-0500