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Chapter 7 AC Zero-Cross Circuit/Noise Filter
127
AC Zero-Cross Control Register
7-4-2 Noise Filter Control Register (NFCTR)
This 6-bit readable and writable register controls the noise filter.
Figure 7-4-1 Noise Filter Control Register (NFCTR: X'03F8A', R/W)
0
1
0
1
0
1
IRQ1 noise filter
sampling period selection
01245673
NFCTR
NF0ENNF0CKS0NF0CKS1
NF1EN
NF1EN
NF1CKS0NF1CKS1
NF1CKS0NF1CKS1
––
0
1
IRQ1 noise filter setup and operation
IRQ1 noise filter off
IRQ1 noise filter on
(at reset: --000000)
NF0EN
0
1
IRQ0 noise filter setup and operation
IRQ0 noise filter off
IRQ0 noise filter on
0
1
0
1
0
1
IRQ0 noise filter
sampling period selection
NF0CKS0NF0CKS1
fs/2
fs/2
fs/2
fs/2
2
8
9
10
fs/2
fs/2
fs/2
fs/2
2
8
9
10