CHAPTER 11 EXTERNAL INTERRUPT CIRCUIT 2 (LEVEL)

11.7Program Example for External Interrupt Circuit 2

An example of programming external interrupt circuit 2 is given below.

■Program Example for External Interrupt Circuit 2

●Processing specification

The external interrupt circuit 2 detects an "L" level signal input to the P00/INT20/AN4 pin and generates an interrupt.

●Coding example

DDR0

EQU

0001H

;

Address of the port data direction register

ADEN

EQU

0034H

;

Address of the A/D enable register

EIE2

EQU

0036H

;

Address of the external interrupt 2 control register

EIF2

EQU

0037H

;

Address of the external interrupt 2 flag register

IF20

EQU

EIF2:0

;

Definition of the external interrupt request flag bit

ILR3

EQU

007DH

;

Address of the interrupt level setting register

INT_V

DSEG

ABS

;

[DATA SEGMENT]

 

ORG

0FFE6H

 

 

 

 

 

 

 

 

IRQA

DW

WARI

;

Interrupt vector setting

INT_V

ENDS

 

 

 

 

 

 

 

 

 

;------------------------

Main program--------------------------------------------------------------------------------

 

 

 

 

 

 

 

CSEG

 

 

;

[CODE SEGMENT]

 

 

 

; Stack pointer (SP) is assumed to have been initialized.

 

:

 

;

 

 

 

 

 

 

 

CLRI

 

 

;

Disable interrupts.

CLRB

IF20

 

;

Clear external interrupt request flag.

MOV

ILR2,#11111110B

;

Set interrupt level to 2.

MOV

DDR0,#00000000B

;

Set pin

 

 

 

 

 

 

INT20/AN4 to serve inputs only.

MOV

ADEN,#00000000B

;

Set pin

 

 

 

 

 

 

INT20/AN4 to enable external interrupt inputs.

MOV

EIE2,#00000001B

;

Enable external interrupt inputs to pin

 

 

 

 

INT20/AN4.

SETI

 

 

;

Enable interrupts.

 

:

 

 

 

 

 

 

 

 

 

;------------------------

Interrupt processing routine----------------------------------------------------------------

WARI

MOV

EIE2,#00000000B

;

Disable external interrupt inputs to pin

 

 

INT20/AN4.

 

CLRB

IF20

;

Clear external interrupt request flag.

256

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Fujitsu MB89202, F202RA manual Aden EQU, EIE2 EQU, EIF2 EQU, Intv Dseg ABS Data Segment ORG 0FFE6H Irqa Wari, Wari MOV
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F202RA, MB89202 specifications

The Fujitsu MB89202 and F202RA microcontrollers are part of the 16-bit microcontroller family, renowned for their robust performance and versatility in a variety of embedded system applications. These devices are tailored for high-efficiency operation across diverse industries, including automotive, consumer electronics, and industrial automation.

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