H8SSLASH2218 datasheet(459/750 Pages) RENESAS

459 / 750 page

Section 12 Serial Communication Interface

Rev.6.00 Jun. 03, 2008 Page 411 of 698

REJ09B0074-0600

Table 12.11 SSR Status Flags and Receive Data Handling

SSR Status Flag

RDRF*

ORER

FER

PER

Receive Data

Receive Error Type

Lost

Overrun error

Transferred to RDR

Framing error

Transferred to RDR

Parity error

Lost

Overrun error + framing error

Lost

Overrun error + parity error

Transferred to RDR

Framing error + parity error

Lost

Overrun error + framing error +

parity error

Note: * The RDRF flag retains the state it had before data reception.

Yes

<End>

[1]

Initialization

Start reception

[2]

Yes

Read RDRF flag in SSR

[4]

[5]

Clear RE bit in SCR to 0

Read ORER, PER, and

FER flags in SSR

Error processing

(Continued on next page)

[3]

Read receive data in RDR, and

clear RDRF flag in SSR to 0

Yes

PER

∨ FER ∨ ORER = 1

RDRF = 1

All data received?

[1]

SCI initialization:

The RxD pin is automatically designated as

the receive data input pin.

[2]

[3] Receive error processing and break

detection:

If a receive error occurs, read the ORER,

PER, and FER flags in SSR to identify the

error. After performing the appropriate error

processing, ensure that the ORER, PER, and

FER flags are all cleared to 0. Reception

cannot be resumed if any of these flags are

set to 1. In the case of a framing error, a

break can be detected by reading the value

of the input port corresponding to the RxD

pin.

[4]

SCI status check and receive data read:

Read SSR and check that RDRF = 1, then

read the receive data in RDR and clear the

RDRF flag to 0. Transition of the RDRF flag

from 0 to 1 can also be identified by an RXI

interrupt.

[5]

Serial reception continuation procedure:

To continue serial reception, before the end

bit for the current frame is received, reading

the RDRF flag and RDR, and clearing the

RDRF flag to 0 should be finished. The

RDRF flag is cleared automatically when

DMAC is activated by a reception complete

interrupt (RXI) and the RDR value is read.

Figure 12.12 Sample Serial Data Reception Flowchart (1)

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