H8SX1663 datasheet(765/1158 Pages) RENESAS

765 / 1158 page

Section 15 Serial Communication Interface (SCI, IrDA, CRC)

Rev.1.00 Jun. 07, 2006 Page 713 of 1102

REJ09B0294-0100

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:

The RxD pin is automatically designated

as the receive data input pin.

[2] ID reception cycle:

Set the MPIE bit in SCR to 1.

[3] SCI state 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 state 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 both 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 15.16 Sample Multiprocessor Serial Reception Flowchart (1)

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