Datasheet

Table Of Contents
Section 13 Serial Communication Interface
Page 444 of 846 REJ09B0140-0900 Rev. 9.00
Sep 16, 2010
H8S/2215 Group
13.6.4 Serial Data Reception (Clocked Synchronous Mode)
Figure 13.22 shows an example of SCI operation for reception in clocked synchronous mode. In
serial reception, the SCI operates as described below.
1. The SCI performs internal initialization synchronous with a synchronous clock input or output,
starts receiving data, and stores the received data in RSR.
2. If an overrun error occurs (when reception of the next data is completed while the RDRF flag
in SSR is still set to 1), the ORER bit in SSR is set to 1. If the RIE bit in SCR is set to 1 at this
time, an ERI interrupt request is generated, receive data is not transferred to RDR, and the
RDRF flag remains to be set to 1.
3. If reception is completed successfully, the RDRF bit in SSR is set to 1, and receive data is
transferred to RDR. If the RIE bit in SCR is set to 1 at this time, an RXI interrupt request is
generated. Continuous reception is possible because the RXI interrupt routine reads the receive
data transferred to RDR before reception of the next receive data has finished.
Bit 7
Serial data
Synchronization
clock
1 frame
RDRF
ORER
ERI interrupt request
generated by overrun
error
RXI interrupt request
generated
RDR data read and
RDRF flag cleared to 0
in RXI interrupt service
routine
RXI interrupt
request
generated
Bit 0
Bit 7 Bit 0 Bit 1 Bit 6 Bit 7
Figure 13.22 Example of SCI Operation in Reception
Reception cannot be resumed while a receive error flag is set to 1. Accordingly, clear the ORER,
FER, PER, and RDRF bits to 0 before resuming reception. Figure 13.23 shows a sample flow
chart for serial data reception.
When the internal clock is selected during reception, the synchronization clock will be output until
an overrun error occurs or the RE bit is cleared. To receive data in frame units, a dummy data of
one frame must be transmitted simultaneously.