CHAPTER 10 SERIAL INTERFACE FUNCTION
User’s Manual U12688EJ4V0UM00
288
Bit Position
Bit Name
Function
Parity Select
Specifies the parity bit length.
PSn1
PSn0
Operation
0
0
No parity, expansion bit operation
0
1
Specifies 0 parity
Transmission side
→
Transmits with parity bit at 0.
Reception side
→
Does not generate parity errors
during receiving.
1
0
Specifies odd parity.
1
1
Specifies even parity.
5, 4
PSn1, PSn0
•
Even parity
If the number of bits whose values are 1 in the transmit data is odd, a parity bit is set
(1). If the number of bits whose values are 1 is even, the parity bit is cleared (0). In
this way, the number of bits in the transmit data and the parity bit which are 1 is
controlled so that it is an even number. During receiving the number of bits in the
receive data and parity bit which are 1 is counted, and if it is an odd number, a parity
error is generated.
•
Odd parity
This is the opposite of even parity, with the number of bits in the transmit data and
parity bit being controlled so that it is an odd number.
During receiving, if the number of bits in the receive data and parity bit which are 1
turns out to be an even number, a parity error is generated.
•
0 parity
During transmission, the parity bit is cleared (0) regardless of the transmit data.
During reception, since no parity bit check is performed, no parity error is generated.
•
No parity
No parity bit is added to transmit data.
During reception, data are received as having no parity bit. Since there is no parity
bit, parity errors are not generated.
Expansion bit operations can be specified with the EBSn bit in the ASIMn1 register.
3
CLn
Character Length
Specifies the character length of 1 frame.
0: 7 bits
1: 8 bits
Remark
n = 0, 1
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