Hitachi H8/3692 ユーザーズマニュアル

Rev. 1.0, 07/01, page 207 of 372

Yes

No

Start reception

[1]

[4]

No

Yes

Read RDRF flag in SSR

[2]

[3]

Clear RE bit in SCR3 to 0

Error processing

(Continued below)

Read receive data in RDR

Yes

No

OER = 1

RDRF = 1

All data received?

Read OER flag in SSR

Start overrun error processing

Overrun error processing

Clear OER flag in SSR to 0

[4]

[1]

Read the OER flag in the serial status 

register(SSR) to determine if there is an 

error. If an overrun error has occurred, 

execute overrun error processing.

[2]

Read SSR and check that the RDRF flag is 

set to 1, then read the receive data in RDR. 

When data is read from RDR, the RDRF 

flag is automatically cleared to 0.

[3]

To continue serial reception, before the 

MSB (bit 7) of the current frame is received, 

read the RDRF flag, read RDR, then clear 

the RDRF flag to 0. When data is read from 

RDR, the RDRF flag is automatically 

cleared to 0.

[4]

If an overrun error occurs, read the OER 

flag in SSR, and after performing the 

appropriate error processing, clear the OER 

flag to 0.  Reception cannot be resumed if 

the OER flag is set to 1.

End

End