Panasonic F77G, MN101C77C user manual IRQ0ICR REDG0 IRQ0IE IRQ0IR, LV1

Models: F77G MN101C77C

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Chapter 3 Interrupts

External Interrupt 0 Control Register (IRQ0ICR)

The external interrupt 0 control register (IRQ0ICR) controls active edge, interrupt enable and interrupt request. Interrupt the maskable interrupt enable flag (MIE) of PSW is "0".

interrupt level of the external interrupt 0, control register should be operated when

IRQ0ICR

7

6

5

4

3

2

1

0

IRQ0

IRQ0

REDG0

-

-

-

IRQ0IE

IRQ0IR

LV1

LV0

 

 

 

 

 

 

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

IRQ0IR

External interrupt

request flag

 

 

 

0No interrupt request

1Interrupt request generated

IRQ0IE

External interrupt

enable flag

 

 

 

0Disable interrupt

1Enable interrupt

REDG0

External interrupt active

edge flag

 

 

 

0Falling edge

1Rising edge

IRQ0

IRQ0

Interrupt level flag

LV1

LV0

for external interrupt

 

 

 

The CPU has interrupt levels from 0 to 3. These flags set the interrupt level for interrupt request.

Figure 3-2-2 External Interrupt 0 Control Register (IRQ0ICR : x'03FE2', R/W)

Control Registers

III - 17

Page 111
Image 111
Panasonic F77G, MN101C77C user manual IRQ0ICR REDG0 IRQ0IE IRQ0IR, LV1