HD64F2149YV datasheet(506/1075 Pages) RENESAS

506 / 1075 page

Section 15 Serial Communication Interface (SCI, IrDA)

Rev. 3.00 Jan 18, 2006 page 478 of 1044

REJ09B0280-0300

Serial Data Transmission (Synchronous Mode): Figure 15.16 shows a sample flowchart for

serial transmission.

The following procedure should be used for serial data transmission.

<End>

[1]

Yes

Initialization

Start transmission

Read TDRE flag in SSR

[2]

Write transmit data to TDR and

clear TDRE flag in SSR to 0

Yes

Read TEND flag in SSR

[3]

Clear TE bit in SCR to 0

TDRE = 1?

All data transmitted?

TEND = 1?

[1] SCI initialization:

The TxD pin is automatically

designated as the transmit data output

pin.

[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, be

sure to 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.

Checking and clearing of the TDRE

flag is automatic when the DTC is

activated by a transmit-data-empty

interrupt (TXI) request and data is

written to TDR.

Figure 15.16 Sample Serial Transmission Flowchart

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