R01UH0823EJ0100 Rev.1.00
Page 1506 of 1823
Jul 31, 2019
RX23W Group
43. Capacitive Touch Sensing Unit (CTSU)
43.2.13
CTSU High-Pass Noise Reduction Spectrum Diffusion Control Register
(CTSUSSC)
CTSUSSDIV[3:0] Bits (CTSU Spectrum Diffusion Frequency Division Setting)
These bits specify the spectrum diffusion frequency division setting according to the base clock frequency division
setting. See the relationship between base clock frequencies and CTSUSSDIV[3:0] bits settings in
, for
setting the value of these bits.
Address(es): CTSU.CTSUSSC 000A 0912h
b15
b14
b13
b12
b11
b10
b9
b8
b7
b6
b5
b4
b3
b2
b1
b0
—
—
—
—
CTSUSSDIV[3:0]
—
—
—
—
—
—
—
—
Value after reset:
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
Bit
Symbol
Bit Name
Description
R/W
b7 to b0
—
Reserved
These bits are read as 0. The write value should be 0. R/W
b11 to b8
CTSU Spectrum Diffusion Frequency
Division Setting
These bits specify the spectrum diffusion frequency
division setting according to the base clock frequency
division setting.
R/W
b15 to b12 —
Reserved
These bits are read as 0. The write value should be 0. R/W
Table 43.5
Relationship between Base Clock Frequencies and CTSUSSDIV[3:0] Bits Settings
Base Clock Frequency fb (MHz)
CTSUSSDIV[3:0] Bits Setting
4.00 ≤ fb
0000b
2.00 ≤ fb < 4.00
0001b
1.33 ≤ fb < 2.00
0010b
1.00 ≤ fb < 1.33
0011b
0.80 ≤ fb < 1.00
0100b
0.67 ≤ fb < 0.80
0101b
0.57 ≤ fb < 0.67
0110b
0.50 ≤ fb < 0.57
0111b
0.44 ≤ fb < 0.50
1000b
0.40 ≤ fb < 0.44
1001b
0.36 ≤ fb < 0.40
1010b
0.33 ≤ fb < 0.36
1011b
0.31 ≤ fb < 0.33
1100b
0.29 ≤ fb < 0.31
1101b
0.27 ≤ fb < 0.29
1110b
fb < 0.27
1111b