Simultaneous Serial Data Transmission And Reception (Clocked Synchronous Mode) - Renesas H8S/2100 Series Hardware Manual

15.6.5 Simultaneous Serial Data Transmission and Reception (Clocked Synchronous
Mode)
Figure 15.20 shows a sample flowchart for simultaneous serial transmit and receive operations.
After initializing the SCI, 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 in SSR are set to 1, clear the TE bit in SCR to 0. Then simultaneously set the TE and RE bits
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 the RE bit to 0. Then after checking
that the RDRF bit in SSR and receive error flags (ORER, FER, and PER) are cleared to 0,
simultaneously set the TE and RE bits to 1 with a single instruction.
Section 15 Serial Communication Interface (SCI)
Rev. 1.00 Apr. 28, 2008 Page 447 of 994
REJ09B0452-0100