Datasheet

Section 14 Serial Communication Interface 3 (SCI3)

Rev. 6.00 Mar. 24, 2006 Page 220 of 412

REJ09B0142-0600

<End>

Yes

Start transmission

Read TDRE flag in SSR[1]

Write transmit data to TDR

Yes

Read TEND flag in SSR

[2]

Clear TE bit in SCR3 to 0

TDRE = 1

All data transmitted?

TEND = 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 automatically cleared

to 0 and clocks are output to start the

data transmission.

[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

Figure 14.11 Sample Serial Transmission Flowchart (Clocked Synchronous Mode)