Restrictions On Using Dtc - Renesas H8S Family Hardware Manual

Section 13 Serial Communication Interface (SCI)

Restrictions on Using DTC

When the external clock source is used as a synchronization clock, update TDR by the DTC and

wait for at least five φ clock cycles before allowing the transmit clock to be input. If the transmit

clock is input within four clock cycles after TDR modification, the SCI may malfunction (figure

When using the DTC to read RDR, be sure to set the receive end interrupt source (RXI) as a DTC

activation source.

Note: When external clock is supplied, t must be more than four clock cycles.

Figure 13.33 Sample Transmission using DTC in Clock Synchronous Mode

Rev. 1.00 Mar. 12, 2008 Page 490 of 1178

REJ09B0403-0100