SH7101 datasheet(341/560 Pages) RENESAS

341 / 560 page

Section 10 Serial Communication Interface (SCI)

Rev.1.00 Sep. 18, 2008 Page 307 of 522

REJ09B0069-0100

<End>

[1]

Yes

Initialization

Start transmission

Read TDRE flag in SSR

[2]

Yes

Read TEND flag in SSR

[3]

Yes

[4]

Clear DR to 0

Clear TE bit in SCR to 0;

select the TxD pin

as an output port with the PFC

TDRE = 1

All data transmitted?

TEND = 1

Break output?

[1] SCI initialization:

Set the TxD pin using the PFC.

After the TE bit is set to 1, 1 is

output for one frame, and

transmission is enabled.

[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.

[3] Serial transmission continuation

procedure:

To continue serial transmission,

read 1 from the TDRE flag to

confirm that writing is possible, then

write data to TDR, and then clear

the TDRE flag to 0.

[4] Break output at the end of serial

transmission:

To output a break in serial

transmission, first clear the port

data register (DR) to 0, then clear

the TE bit to 0 in SCR and use the

PFC to select the TxD pin as an

output port.

Write transmit data to TDR

and clear TDRE flag in SSR to 0

Figure 10.7 Sample Serial Transmission Flowchart

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