H8S2472 Datasheet, PDF (502/1250 Pages) Renesas Technology Corp – 16-Bit Single-Chip Microcomputer H8S Family / H8S/2400 Series

Section 13 Serial Communication Interface (SCI)
13.4.3 Clock
Either an internal clock generated by the on-chip baud rate generator or an external clock input at
the SCK pin can be selected as the SCI's transfer clock, according to the setting of the C/A bit in
SMR and the CKE1 and CKE0 bits in SCR. When an external clock is input at the SCK pin, the
clock frequency should be 16 times the bit rate used.
When the SCI is operated on an internal clock, the clock can be output from the SCK pin. The
frequency of the clock output in this case is equal to the bit rate, and the phase is such that the
rising edge of the clock is in the middle of the transmit data, as shown in figure 13.4.
SCK
TxD
0 D0 D1 D2 D3 D4 D5 D6 D7 0/1 1 1
1 frame
Figure 13.4 Relation between Output Clock and Transmit Data Phase
(Asynchronous Mode)
Rev. 2.00 Aug. 20, 2008 Page 454 of 1198
REJ09B0403-0200