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CHAPTER 11 SERIAL INTERFACE FUNCTION
User’s Manual U15109EJ3V0UD
443
Figure 11-45. ASISn Setting (Asynchronous Serial Interface Mode)
After reset: 00H
R
Address: ASIS0:
FFFFF302H
ASIS1:
FFFFF312H
ASIS2:
FFFFF232H
ASIS3:
FFFFF2B2H
7
6
5
4
3
<2>
<1>
<0>
ASISn
0
0
0
0
0
PEn
FEn
OVEn
(n = 0 to 3)
PEn
Parity error flag
0
No parity error
1
Parity error
(Transmit data parity does not match)
FEn
Framing error flag
0
No framing error
1
Framing error
Note 1
(Stop bit not detected)
OVEn
Overrun error flag
0
No overrun error
1
Overrun error
Note 2
(Next receive operation was completed before data was read from receive buffer register)
Notes 1.
Even if the stop bit length has been set as two bits by setting bit 2 (SLn) in the asynchronous
serial interface mode register n (ASIMn), stop bit detection during a receive operation only applies
to a stop bit length of 1 bit.
2.
Be sure to read the contents of receive buffer register n (RXBn) when an overrun error has
occurred.
Until the contents of RXBn are read, further overrun errors will occur when receiving data.