Datasheet

Section 15 Serial Communication Interface (SCI, IrDA)
Page 924 of 1384 R01UH0310EJ0500 Rev. 5.00
Sep 25, 2012
H8S/2426, H8S/2426R, H8S/2424 Group
Yes
<End>
[1]
No
Initialization
Start of reception
[2]
No
Yes
Read RDRF flag in SSR [4]
[5]
Clear RE bit in SCR to 0
Error processing
(Continued below)
[3]
Read receive data in RDR, and
clear RDRF flag in SSR to 0
No
Yes
ORER = 1?
RDRF = 1?
All data received?
Read ORER flag in SSR
[1]
[2] [3]
[4]
[5]
SCI initialization:
The RxD pin is automatically
designated as the receive data
input pin.
Receive error handling:
If a receive error occurs, read the
ORER flag in SSR, and after
performing the appropriate error
handling, clear the ORER flag to
0. Transfer cannot be resumed if
the ORER flag is set to 1.
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.
Serial reception continuation
procedure:
To continue serial reception,
before the MSB (bit 7) of the
current frame is received, finish
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.
<End>
Error handling
Overrun error handling
[3]
Clear ORER flag in SSR to 0
Figure 15.19 Sample Serial Reception Flowchart