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

6-bit single-chip microcomputer

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Section 14 Serial Communication Interface (SCI)

Simultaneous Serial Data Transmission and Reception (Clocked Synchronous

Figure 14.20 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.

Rev. 1.00 May 09, 2008 Page 406 of 954

REJ09B0462-0100