MN101C115 Datasheet, PDF (138/170 Pages) Panasonic Semiconductor – Request for your special attention and precautions in using the technical information and semiconductors described in this book

Chapter 7 AC Zero-Cross Circuit/Noise Filter
7-3 Noise Filter
7-3-1 Overview
External interrupt pins IRQ0 and IRQ1 contain noise filtering circuit. This
circuitry can be used for remote control signal reception.
IRQ0: External interrupt 0
IRQ1: External interrupt 1
fs/2²
fs/2⁸
MUX
fs/2⁹
fs/2¹⁰
P20/IRQ0
Data bus
2
2
NFCTR
0
NF0EN
NF0CKS0
NF0CKS1
NF1EN
NF1CKS0
NF1CKS1
7
Noise filter
MUX
To IRQ0
interrupt
P21/IRQ1/SENS
fs/2²
fs/2⁸
fs/2⁹
MUX
fs/2¹⁰
AC zero-cross
circuit
(Fig.7-1-1)
Noise filter
MUX
To IRQ1
interrupt
Figure 7-3-1 Noise Filtering Circuit Block Diagram
124 Noise Filter