Figure 15.39 Sample Flowchart For Mode Transition During Reception - Renesas H8S Series Hardware Manual

Section 15 Serial Communication Interface (SCI, IrDA)
(2) Reception
Before making the transition to module stop, software standby, watch, sub-active, or sub-sleep
mode, stop reception (RE = 0). RSR, RDR, and SSR are reset. If 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 15.39 shows a sample flowchart for mode transition during reception.
Read RDRF flag in SSR
Read receive data in RDR
Make transition to software standby mode etc.
Cancel software standby mode etc.
Change operating mode?
Start reception

Figure 15.39 Sample Flowchart for Mode Transition during Reception

Rev. 3.00 Jul. 14, 2005 Page 502 of 986
REJ09B0098-0300
Reception
No
RDRF = 1
Yes
RE = 0
No
Yes
Initialization
[1] [1] Data being received will be invalid.
[2] Module stop, watch, sub-active, and sub-
sleep modes are included.
[2]
RE = 1