Panasonic F77G, MN101C77C user manual IRQ2ICR REDG2 IRQ2IE IRQ2IR, IRQ2 LV1 LV0

Models: F77G MN101C77C

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Chapter 3 Interrupts

External Interrupt 2 Control Register (IRQ2ICR)

The external interrupt 2 control register (IRQ2ICR) controls interrupt level of external interrupt 2, active edge, interrupt enable and interrupt request. Interrupt control register should be operated when the maskable interrupt enable flag (MIE) of PSW is "0".

IRQ2ICR

7

6

5

4

3

2

1

0

IRQ2

IRQ2

REDG2

-

-

-

IRQ2IE

IRQ2IR

LV1

LV0

 

 

 

 

 

 

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

IRQ2IR

External interrupt request flag

 

 

0No interrupt request

1Interrupt request generated

IRQ2IE

External interrupt enable flag

 

 

0Disable interrupt

1Enable interrupt

REDG2

External interrupt active edge flag

0Falling edge

1Rising edge

IRQ2

LV1

IRQ2

LV0

Interrupt level flag for external interrupt

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

Figure 3-2-4 External Interrupt 2 Control Register (IRQ2ICR : x'03FE4', R/W)

Control Registers

III - 19

Page 113
Image 113
Panasonic F77G, MN101C77C user manual IRQ2ICR REDG2 IRQ2IE IRQ2IR, IRQ2 LV1 LV0