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Chapter 12
Serial Interface Function
Preliminary User’s Manual U14913EE1V0UM00
Figure 12-2: Asynchronous Serial Interface Mode Registers 0 to 2 (ASIM0 to ASIM2) (3/3)
Bit Position
Bit Name
Function
4, 3
PS1, PS0
• 0 parity
During transmission, the parity bit is cleared (0) regardless of the transmit
data.
During reception, no parity error is generated because no parity bit is
checked.
• No parity
No parity bit is added to transmit data.
During reception, the receive data is considered to have no parity bit. No
parity error is generated because there is no parity bit.
2
CL
Specifies character length of transmit/receive data.
0: 7
bits
1: 8
bits
Caution:
To overwrite the CL bit, first clear (0) the TXE and RXE
bits.
1
SL
Specifies stop bit length of transmit data.
0: 1
bit
1: 2
bits
Caution:
To overwrite the SL bit, first clear (0) the TXE bit. Since
reception is always done using a single stop bit, the SL bit
setting does not affect receive operations.
0
ISRM
Enables/disables generation of reception completion interrupt requests
when an error occurs.
0: Generate a reception error interrupt request (INTSERn) as an interrupt
when an error occurs.
In this case, no reception completion interrupt request (INTSRn) is gen-
erated.
1: Generate a reception completion interrupt request (INTSRn) as an
interrupt when an error occurs.
In this case, no reception error interrupt request (INTSERn) is gener-
ated.
Caution:
To overwrite the ISRM bit, first clear (0) the RXE bit.
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