Datasheet

Section 17 Serial Communication Interface 3 (SCI3)

Rev. 3.00 Mar. 15, 2006 Page 321 of 526

REJ09B0060-0300

<End>

Yes

Start transmission

Read TDRE flag in SSR

[1]

[2]

[3]

TDRE = 1

[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.

Yes

Write transmit data to TDR

All data transmitted?

Yes

Read TEND flag in SSR

Clear TE bit in SCR3 to 0

Clear PDR to 0 and set PCR to 1

TEND = 1

Yes

Break output?

Figure 17.6 Sample Serial Transmission Data Flowchart (Asynchronous Mode)