Datasheet

Section 16 Serial Communication Interface with FIFO (SCIF)

Rev. 3.00 Sep. 28, 2009 Page 495 of 910

REJ09B0350-0300

(3) Data Transmission

Figure 16.8 shows an example of the data transmission flowchart.

Read CTS flag in FMSR

Read THRE flag in FLSR

← 0

i ← i + 1

Write transmit data to transmit FIFO

CTS = 1

THRE = 1

Yes

No No

Yes

(End of transmission or transmission standby)

Yes

Transmission/reception standby

[1]

[2]

[3]

[4]

[1] Confirm that the CTS flag in FMSR is 1.

[2] Confirm that the THRE flag in FLSR is 1 to

ensure that the transmit FIFO is empty.

[3] Write up to 16 bytes of transmit data in the

transmit FIFO. If the transmit data is 17 bytes

or more, return to step [2] to write transmit

data in the transmit FIFO again.

[4] When all of the data has been written, go

to the transmission/reception standby flow.

i < 16?

All data written

Figure 16.8 Example of Data Transmission Flowchart