HD6432351 datasheet(632/1025 Pages) RENESAS

632 / 1025 page

Section 13 Serial Communication Interface (SCI)

Rev. 3.00 Sep 15, 2006 page 598 of 988

REJ09B0330-0300

Serial data transmission (clocked synchronous mode): Figure 13.16 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 DMAC or

DTC is activated by a transmit data

empty interrupt (TXI) request and data

is written to TDR.

Figure 13.16 Sample Serial Transmission Flowchart

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