SH7101 datasheet(359/560 Pages) RENESAS

359 / 560 page

Section 10 Serial Communication Interface (SCI)

Rev.1.00 Sep. 18, 2008 Page 325 of 522

REJ09B0069-0100

Yes

<End>

[1]

Initialization

Start transmission/reception

[5]

Error processing

[3]

Yes

ORER = 1

All data received?

[2]

Read TDRE flag in SSR

Yes

TDRE = 1

Write transmit data to TDR and

clear TDRE flag in SSR to 0

Yes

RDRF = 1

Read ORER flag in SSR

[4]

Read RDRF flag in SSR

[1] SCI initialization:

Set the TxD and RxD pins using the PFC.

[2] SCI status check and transmit data write:

Read SSR and check that the TDRE flag

is set to 1, then write transmit data to

TDR and clear the TDRE flag to 0.

Transition of the TDRE flag from 0 to 1

can also be identified by a TXI interrupt.

[3] Receive error processing:

If a receive error occurs, read the ORER

flag in SSR, and after performing the

appropriate error processing, clear the

ORER flag to 0. Transmission/reception

cannot be resumed if the ORER flag is

set to 1.

[4] SCI status check and receive data read:

Read SSR and check that the RDRF flag

is set to 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 transmission/reception continuation

procedure:

To continue serial transmission/

reception, before the MSB (bit 7) of the

current frame is received, finish reading

the RDRF flag, reading RDR, and

clearing the RDRF flag to 0. Also, before

the MSB (bit 7) of the current frame is

transmitted, read 1 from the TDRE flag to

confirm that writing is possible. Then

write data to TDR and clear the TDRE

flag to 0.

Note: When switching from transmit or receive operation to simultaneous transmit and receive operations,

first clear the TE bit and RE bit to 0, then set both these bits to 1 simultaneously.

Clear TE and RE bits in SCR to 0

Read receive data in RDR, and

clear RDRF flag in SSR to 0

Figure 10.20 Sample Flowchart of Simultaneous Serial Transmit and Receive Operations

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