Datasheet

Section 13 Serial Communication Interface 3 (SCI3)

Rev.4.00 Nov. 02, 2005 Page 180 of 304

REJ09B0143-0400

<End>

Yes

Start transmission

Read TDRE flag in SSR[1]

Write transmit data to TDR

Yes

Read TEND flag in SSR

[2]

Yes

[3]

Clear PDR to 0 and

set PCR to 1

Clear TE bit in SCR3 to 0

TDRE = 1

All data transmitted?

TEND = 1

Break output?

[1] Read SSR and check that the

TDRE flag is set to 1, then write

transmit data to TDR. When data is

written to TDR, the TDRE flag is

automaticaly cleared to 0.

[2] To continue serial transmission,

read 1 from the TDRE flag to

confirm that writing is possible,

then write data to TDR. When data

is written to TDR, the TDRE flag is

automaticaly cleared to 0.

[3] To output a break in serial

transmission, after setting PCR to 1

and PDR to 0, clear TxD in PMR1

to 0, then clear the TE bit in SCR3

to 0.

Figure 13.6 Sample Serial Transmission Flowchart (Asynchronous Mode)