Renesas rl78 User Manual
RL78/G1A
CHAPTER 12 SERIAL ARRAY UNIT
R01UH0305EJ0200 Rev.2.00
501
Jul 04, 2013
12.5.9 Procedure for processing errors that occurred during 3-wire serial I/O (CSI00, CSI01, CSI10, CSI11, CSI20,
CSI21) communication
The procedure for processing errors that occurred during 3-wire serial I/O (CSI00, CSI01, CSI10, CSI11, CSI20, CSI21)
communication is described in Figure 12-74.
Figure 12-74. Processing Procedure in Case of Overrun Error
Software Manipulation
Hardware Status
Remark
Reads serial data register mn (SDRmn).
The BFFmn bit of the SSRmn register is
set to 0 and channel n is enabled to
receive data.
This is to prevent an overrun error if the
next reception is completed during error
processing.
Reads serial status register mn
(SSRmn).
Error type is identified and the read
value is used to clear error flag.
Writes 1 to serial flag clear trigger
register mn (SIRmn).
Error flag is cleared.
Error can be cleared only during
reading, by writing the value read from
the SSRmn register to the SIRmn
register without modification.
Remark m: Unit number (m = 0, 1), n: Channel number (n = 0 to 3), mn = 00 to 03, 10, 11