SH7101 datasheet(345/486 Pages) RENESAS

345 / 486 page

10. Serial Communication Interface (SCI)

Rev.2.00 Sep. 27, 2007 Page 311 of 448

REJ09B0394-0200

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?

Set MPIE bit in SCR to 1

[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

[1] SCI initialization:

Set the RxD pin using the PFC.

[2] ID reception cycle:

Set the MPIE bit in SCR to 1.

[3] 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.

[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 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.

Figure 10.13 Sample Multiprocessor Serial Reception Flowchart (1)

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