HD6412240 RENESAS [Renesas Technology Corp], HD6412240 Datasheet - Page 512

• Manufacturer Part Number: HD6412240
• Description: Renesas 16-Bit Single-Chip Microcomputer H8S Family / H8S/2200 Series
• Manufacturer: RENESAS [Renesas Technology Corp]

Section 12 Serial Communication Interface (SCI)
Rev.3.00 Mar. 26, 2007 Page 470 of 772
REJ09B0355-0300
Reception
Receive operation should be stopped (by clearing RE to 0) before making a module stop mode
or software standby 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 12.26 shows a sample flowchart for mode transition during reception.
Figure 12.26 Sample Flowchart for Mode Transition during Reception
Read receive data in RDR
Read RDRF flag in SSR
Transition to software
<Start of reception>
standby mode, etc.
standby mode, etc.
Exit from software
operating mode?
Yes
Yes
<Reception>
RDRF = 1?
Initialization
Change
RE = 0
No
No
RE = 1
[1]
[2]
[1] Receive data being received
[2] Includes module stop mode.
becomes invalid.