Datasheet

Section 14 Serial Communication Interface 3 (SCI3)

Rev.5.00 Nov. 02, 2005 Page 223 of 418

REJ09B0028-0500

<End>

Yes

Start transmission

Read TDRE flag in SSR[1]

Set MPBT bit in SSR

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?

Write transmit data to TDR

[1] Read SSR and check that the TDRE

flag is set to 1, set the MPBT bit in

SSR to 0 or 1, then write transmit

data to TDR. When data is written to

TDR, the TDRE flag is automatically

cleared to 0.

[2] To continue serial transmission, be

sure to 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

automatically cleared to 0.

[3] To output a break in serial

transmission, set the port PCR to 1,

clear PDR to 0, then clear the TE bit

in SCR3 to 0.

Figure 14.16 Sample Multiprocessor Serial Transmission Flowchart