Hitachi H8S/2646 Hardware Manual page 503

Table 13-11 Receive Errors and Conditions for Occurrence
Receive Error Abbreviation
Overrun error ORER
Framing error FER
Parity error PER
Figure 13-8 shows an example of the operation for reception in asynchronous mode.
Start
1 bit
0 D0
RDRF
FER
Occurrence Condition
When the next data reception is
completed while the RDRF flag
in SSR is set to 1
When the stop bit is 0
When the received data differs
from the parity (even or odd) set
in SMR
Data Parity
bit
D1 D7 0/1
RXI interrupt
request
generated
1 frame
Figure 13-8 Example of SCI Operation in Reception
(Example with 8-Bit Data, Parity, One Stop Bit)
Stop Start
bit bit
1 0 D0 D1
RDR data read and RDRF
flag cleared to 0 in RXI
interrupt service routine
Data Transfer
Receive data is not
transferred from RSR to
RDR.
Receive data is transferred
from RSR to RDR.
Receive data is transferred
from RSR to RDR.
Data Parity Stop
bit bit
0
D7 0/1
ERI interrupt request
generated by framing
error
1
Idle state
(mark state)
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