Hitachi H8S/2378, H8S/2378R Series Hardware Manual page 718

Set MPIE bit in SCR to 1
Read ORER and FER flags in SSR
Read RDRF flag in SSR
No
Read receive data in RDR
No
Read ORER and FER flags in SSR
Read RDRF flag in SSR
Read receive data in RDR
No
Clear RE bit in SCR to 0
Figure 15.13 Sample Multiprocessor Serial Reception Flowchart (1)
Rev. 1.0, 09/01, page 674 of 904
Initialization
Start of reception
FER ∨ ORER = 1?
No
RDRF = 1?
Yes
This station's ID?
Yes
FER ∨ ORER = 1?
No
RDRF = 1?
Yes
All data received?
Yes
<End>
[1] SCI initialization:
[1]
The RxD pin is automatically
designated as the receive data
input pin.
[2]
ID reception cycle:
[2]
Set the MPIE bit in SCR to 1.
[3]
SCI status check, ID reception
and comparison:
Yes
Read SSR and check that the
RDRF flag is set to 1, then read
the receive data in RDR and
compare it with this station's ID.
[3]
If the data is not this station's ID,
set the MPIE bit to 1 again, and
clear the RDRF flag to 0.
If the data is this station's ID,
clear the RDRF flag to 0.
[4]
SCI status check and data
reception:
Read SSR and check that the
RDRF flag is set to 1, then read
the data in RDR.
[5] Receive error handling and break
detection:
If a receive error occurs, read the
ORER and FER flags in SSR to
Yes identify the error. After
performing the appropriate error
handling, ensure that the ORER
and FER flags are both cleared
to 0.
[4]
Reception cannot be resumed if
either of these flags is set to 1.
No
In the case of a framing error, a
break can be detected by reading
the RxD pin value.
[5]
Error handling
(Continued on
next page)