HD6432160 RENESAS [Renesas Technology Corp], HD6432160 Datasheet - Page 418
HD6432160
Manufacturer Part Number
HD6432160
Description
Hitachi 16-Bit Single-Chip Microcomputer
Manufacturer
RENESAS [Renesas Technology Corp]
Datasheet
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15.6.4
Figure 15.18 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 in synchronization with a synchronization clock input
2. If an overrun error (when reception of the next data is completed while the RDRF flag is still
3. If reception finishes successfully, the RDRF bit in SSR is set to 1, and receive data is
Rev. 2.0, 08/02, page 378 of 788
Synchronization
clock
Serial data
RDRF
ORER
or output, starts receiving data, and stores the receive data in RSR.
set to 1) occurs, 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. The RDRF flag
remains to be set to 1.
transferred to RDR. If the RIE bit in SCR is set to 1 at this time, an RXI interrupt request is
generated. Because the RXI interrupt routine reads the receive data transferred to RDR before
reception of the next receive data has finished, continuous reception can be enabled.
Figure 15.18 Example of SCI Receive Operation in Clocked Synchronous Mode
Serial Data Reception (Clocked Synchronous Mode)
RXI interrupt
request
generated
Bit 7
Bit 0
RDR data read and
RDRF flag cleared
to 0 in RXI interrupt
handling routine
1 frame
Bit 7
Bit 0
RXI interrupt
request generated
Bit 1
ERI interrupt request
generated by overrun
error
Bit 6
Bit 7
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