R01UH0823EJ0100 Rev.1.00
Page 1000 of 1823
Jul 31, 2019
RX23W Group
33. Serial Communications Interface (SCIg, SCIh)
33.2.14
Noise Filter Setting Register (SNFR)
Note 1. Writing to these bits is only possible when the RE and TE bits in the SCR are 0 (serial reception and transmission disabled).
NFCS[2:0] Bits (Noise Filter Clock Select)
These bits select the sampling clock for the digital noise filter. To use the noise filter in asynchronous mode, set these bits
to 000b. In simple I
2
C mode, set the bits to a value in the range from 001b to 100b.
Address(es): SCI1.SNFR 0008 A028h, SCI5.SNFR 0008 A0A8h, SCI8.SNFR 0008 A108h, SCI12.SNFR 0008 B308h
b7
b6
b5
b4
b3
b2
b1
b0
—
—
—
—
—
NFCS[2:0]
Value after reset:
0
0
0
0
0
0
0
0
Bit
Symbol
Bit Name
Description
R/W
b2 to b0
Noise Filter Clock Select
In asynchronous mode, the standard setting for the base clock is as
follows.
b2
b0
0 0 0: The clock signal divided by 1 is used with the noise filter.
In simple I
2
C mode, the standard settings for the clock source of the
on-chip baud rate generator selected by the SMR.CKS[1:0] bits are
given below.
b2
b0
0 0 1: The clock signal divided by 1 is used with the noise filter.
0 1 0: The clock signal divided by 2 is used with the noise filter.
0 1 1: The clock signal divided by 4 is used with the noise filter.
1 0 0: The clock signal divided by 8 is used with the noise filter.
Settings other than above are prohibited.
b7 to b3
—
Reserved
These bits are read as 0. The write value should be 0.
R/W