HD64F2145 datasheet(428/829 Pages) RENESAS

428 / 829 page

Rev. 2.0, 08/02, page 388 of 788

Reception: Before making a transition to module stop, software standby, watch, sub-active, or

sub-sleep mode, stop reception (RE = 0). RSR, RDR, and SSR are reset. If a transition is made

during data reception, the data being received will be invalid.

To receive data in the same reception mode after mode cancellation, set RE to 1, and then start

reception. To receive data in a different reception mode, initialize the SCI first.

Figure 15.27 shows a sample flowchart for mode transition during reception.

Start transmission

Transmission

[1]

Yes

Read TEND flag in SSR

Make transition to software standby mode etc.

Cancel software standby mode etc.

TE = 0

Initialization

TE = 1

[2]

[3]

All data transmitted?

Change operating mode?

TEND = 1

[1] Data being transmitted is lost

halfway. Data can be normally

transmitted from the CPU by

setting TE to 1, reading SSR,

writing to TDR, and clearing

TDRE to 0 after mode

cancellation; however, if the DTC

has been initiated, the data

remaining in DTC RAM will be

transmitted when TE and TIE are

set to 0.

[2] Also clear TIE and TEIE to 0

when they are 1.

[3] Module stop, watch, sub-active,

and sub-sleep modes are

included.

Figure 15.24 Sample Flowchart for Mode Transition during Transmission

HD64F2145 Datasheet(PDF) 428 Page - Renesas Technology Corp