Datasheet

Section 15 Serial Communication Interface (SCI)

Rev. 6.00 Mar. 18, 2010 Page 629 of 982

REJ09B0054-0600

• Reception

Receive operation should be stopped (by clearing RE to 0) before making a module stop mode,

software standby mode, watch mode, subactive mode, or subsleep mode transition. RSR, RDR,

and SSR are reset. If a transition is made without stopping operation, the data being received

will be invalid.

To continue receiving without changing the reception mode after the relevant mode is cleared,

set RE to 1 before starting reception. To receive with a different receive mode, the procedure

must be started again from initialization.

Figure 15.42 shows a sample flowchart for mode transition during reception.

RE = 0

Transition to software

standby mode, etc.

Read receive data in RDR

Read RDRF flag in SSR

Exit from software

standby mode, etc.

Change

operating mode?

RDRF = 1

Yes

No [1]

[2]

RE = 1Initialization

[1] Receive data being received

becomes invalid.

[2] Includes module stop mode,

watch mode, subactive mode,

and subsleep mode.

Figure 15.42 Sample Flowchart for Mode Transition during Reception