Panasonic MN101C77C User Manual

III - 39

Chapter 3    Interrupts

External Interrupts

■

External Interrupt 0 Interface, External Interrupt 1 Interface, Block Diagram

3-bit prescaler

1/2

1/2

1/2

S

fosc/2

10

fosc/2 

9

 

fosc/2 

8

M

U
X

0

7

NF0EN

NF0SCK0

NF0SCK1

-

NF1EN

NF1SCK0

NFCTR0

fosc/2

 7 

(Prescaler
  output signal)

S

S

P21IM

NF1SCK1

fosc

Noise filter 0

P20/IRQ0

M

U
X

Polarity

Inversion

M

U
X

IRQ0 interrupt request/
16-bit timer 

M

U
X

Noise filter 1

P21/IRQ1/ACZ

M

U
X

Polarity

Inversion

M

U
X

IRQ0 interrupt request/
16-bit timer 

AC zero cross detection 
circuit

M

U
X

Standby mode signal

Standby mode signal

0

7

IRQ0IR

IRQ0IE

-

-

REDG0

IRQ0ICR

IRQ0LV1

IRQ0LV0

-

0

7

IRQ1IR

IRQ1IE

-

-

REDG1

IRQ1ICR

IRQ1LV1

IRQ1LV0

-

0

7

EDGSEL0

EDGSEL1

EDGSEL2

EDGSEL3

EDGSEL4

Reserved

-

-

EDGDT

0

7

PSCEN

-

-

-

-

PSCMD

-

-

-

Edge detection

M

U
X

M

U
X

Edge detection