CHAPTER 10 SERIAL INTERFACE FUNCTION
User’s Manual U14492EJ3V0UD
453
<7>
SOT1
ASIS1
<6>
SIR1
5
0
4
RB8
3
0
<2>
PE1
<1>
FE1
<0>
OVE1
Address
FFFFFA2CH
Initial value
00H
<7>
SOT2
ASIS2
<6>
SIR2
5
0
4
RB8
3
0
<2>
PE2
<1>
FE2
<0>
OVE2
Address
FFFFFA4CH
Initial value
00H
Bit Position
Bit Name
Function
7
SOTn
Status flag indicating transmission status
0: Transmission end timing (when INTSTn is generated)
1: Indicates transmission status
Note
Note
The transmission status is the status until the specified number of stop
bits has been transmitted following write operation to the transmit register.
During 2-frame continuous transmission, this status is until the stop bit of
the 2nd frame has been transmitted.
6
SIRn
Status flag indicating reception status
0: Reception end timing (when INTSRn is generated)
1: Indicates reception status
Note
Note
The reception status is the status until stop bit detection from the start bit
detection timing.
4
RB8
Indicates contents of receive data extension bit (1 bit) when 9-bit extended format
is specified (EBS bit of ASIMn1 register = 1).
2
PEn
Status flag indicating parity error
0: Processing to read data from reception buffer
1: When transmit parity and receive parity don’t match
Caution No parity error is generated if no parity is specified or 0 parity is
specified with the PS1, PS0 bits of the ASIMn0 register.
1
FEn
Status flag indicating framing error
0: Processing to read data from reception buffer
1: When stop bit is not detected
0
OVEn
Status flag indicating overrun error
0: Processing to read data from reception buffer
1: When UARTn has completed next reception processing prior to loading
receive data from reception buffer
Since the contents of the reception shift register are transferred to the reception
buffer (RXBn, RXBLn) every time 1 frame is received, the following receive data is
overwritten to the reception buffer (RXBn, RXBLn) and the previous receive data is
discarded.
Remark
n = 1 , 2