Datasheet

Section 13 Serial Communication Interface (SCI)
Rev. 2.00 Sep. 28, 2009 Page 389 of 870
REJ09B0429-0200
13.9.6 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
13.33).
When using the DTC to read RDR, be sure to set the receive end interrupt source (RXI) as a DTC
activation source.
t
D0
LSB
Serial data
SCK
D1 D3 D4 D5D2 D6 D7
Note: When external clock is supplied, t must be more than four clock cycles.
TDRE
Figure 13.33 Sample Transmission using DTC in Clock Synchronous Mode