H8S2245 datasheet(492/818 Pages) RENESAS

492 / 818 page

Section 12 Serial Communication Interface (SCI)

Rev.3.00 Mar. 26, 2007 Page 450 of 772

REJ09B0355-0300

Yes

<End>

[1]

Initialization

Start reception

Yes

[4]

Clear RE bit in SCR to 0

Error processing

(Continued on

next page)

[5]

Yes

FER

∨ ORER = 1?

RDRF = 1?

All data received?

Read MPIE bit in SCR

[2]

Read ORER and FER flags in SSR

Read RDRF flag in SSR

[3]

Read receive data in RDR

Yes

This station's ID?

Read ORER and FER flags in SSR

Yes

Read RDRF flag in SSR

Yes

FER

∨ ORER = 1?

Read receive data in RDR

RDRF = 1?

SCI initialization:

The RxD pin is automatically

designated as the receive data

input pin.

ID reception cycle:

Set the MPIE bit in SCR to 1.

SCI status check, ID reception

and comparison:

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.

If the data is this station's ID,

clear the RDRF flag to 0.

SCI status check and data

reception:

Read SSR and check that the

RDRF flag is set to 1, then read

the data in RDR.

Receive error processing and

break detection:

If a receive error occurs, read the

ORER and FER flags in SSR to

identify the error. After

performing the appropriate error

processing, ensure that the

ORER 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.

[1]

[2]

[3]

[4]

[5]

Figure 12.12 Sample Multiprocessor Serial Reception Flowchart

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