Hitachi H8/3692 ユーザーズマニュアル

Rev. 1.0, 07/01, page 214 of 372

Yes

No

Start reception

No

Yes

[4]

Clear RE bit in SCR3 to 0

Error processing

[5]

Yes

No

FER+OER = 1

RDRF = 1

All data received?

Read MPIE bit in SCR3

[1]

[2]

Read OER and FER flags in SSR

Read RDRF flag in SSR

[3]

Read receive data in RDR

No

Yes

[A]

This station’s ID?

Read OER and FER flags in SSR

Yes

No

Read RDRF flag in SSR

No

Yes

FER+OER = 1

Read receive data in RDR

RDRF = 1

[1]

Set the MPIE bit in SCR to 1.

[2]

Read OER and FER in SSR to check for 

errors. Receive error processing is performed 

in cases where a receive error occurs.

[3]

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.  

If the data is not this station’s ID, set the MPIE 

bit to 1 again, and clear the RDRF flag to 0.

When data is read from RDR, the RDRF flag 

is automatically cleared to 0.

[4]

Read SSR and check that the RDRF flag is 

set to 1, then read the data in RDR.

[5]

If a receive error occurs, read the OER and 

FER flags in SSR to identify the error.  After 

performing the appropriate error processing, 

ensure that the OER and FER flags are all 

cleared to 0.

Reception cannot be resumed if either of 

these flags is set to 1.

In the case of a framing error, a break can be 

detected by reading the RxD pin value.

End

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