Panasonic F77G, MN101C77C user manual NFCTR0 P21IM, NF0EN, NF1EN

Models: F77G MN101C77C

1 544
Download 544 pages 59.61 Kb
Page 137
Image 137

Chapter 3 Interrupts

Noise Filter Control Register 0 (NFCTR0)

The noise filter control register (NFCTR0) sets the noise remove function for IRQ0 and IRQ1 and also selects the sampling cycle of noise remove function. And this register also set the AC zero cross detec- tion function for IRQ1.

NFCTR0

7

P21IM

65

NF1SCK1 NF1SCK0

4

3

2

1

 

0

 

NF1EN

-

NF0SCK1

NF0SCK0

NF0EN

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

( At reset : 0 0 0 0 - 0 0 0 )

NF0EN

IRQ0/ noise filter setup

0Noise filter OFF

1Noise filter ON

NF0SCK1

 

NF0SCK0

IRQ0/ noise filter sampling period

0

0

fosc

 

 

 

1

fosc/2 8

 

1

 

0

fosc/2 9

1

fosc/2 10

 

NF1EN

IRQ1/ noise filter setup

 

0

Noise filter OFF

 

1

Noise filter ON

 

 

 

 

NF1SCK1

 

NF1SCK0

IRQ1/ noise filter sampling period

0

 

0

fosc

 

1

fosc/2 8

 

 

1

 

0

fosc/2 9

 

 

 

 

1

fosc/2 10

 

 

P21IM

ACZ input enable flag

 

0

Disable ACZ input

 

1

Enable ACZ input

Figure 3-3-4 Noise Filter Control Register 0 (NFCTR0 : x'03F8E', R/W)

External Interrupts

III - 43

Page 137
Image 137
Panasonic F77G, MN101C77C user manual NFCTR0 P21IM, NF0EN, NF1EN