HD6432633 Datasheet, PDF (804/1453 Pages) Renesas Technology Corp – Series of Microcomputers (MCUs: microcomputer units)

No
No
[3]
Initialization
Start reception
[1]
[1] SCI initialization:
The RxD pin is automatically
designated as the receive data
input pin.
Read ORER flag in SSR
[2]
ORER= 1
Yes
[3]
No
Error processing
(Continued below)
Read RDRF flag in SSR
[4]
RDRF= 1
Yes
[2] [3] Receive error processing:
If a receive error occurs, read the
ORER flag in SSR , and after
performing the appropriate error
processing, clear the ORER flag
to 0. Transfer cannot be resumed
if the ORER flag is set to 1.
[4] SCI status check and receive
data read:
Read SSR and check that the
RDRF flag is set to 1, then read
the receive data in RDR and
clear the RDRF flag to 0.
Transition of the RDRF flag from
0 to 1 can also be identified by
an RXI interrupt.
Read receive data in RDR, and
clear RDRF flag in SSR to 0
All data received?
Yes
Clear RE bit in SCR to 0
<End>
[5] Serial reception continuation
procedure:
To continue serial reception,
before the MSB (bit 7) of the
current frame is received, finish
[5]
reading the RDRF flag, reading
RDR, and clearing the RDRF flag
to 0. The RDRF flag is cleared
automatically when the DMAC^*
or DTC^* is activated by a receive
data full interrupt (RXI) request
and the RDR value is read.
Error processing
Overrun error processing
Note: * DMAC and DTC functions
are not available in the
H8S/2695.
Clear ORER flag in SSR to 0
<End>
Figure 16-18 Sample Serial Reception Flowchart
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