微机原理.docx

微机原理.docx

《微机原理.docx》由会员分享，可在线阅读，更多相关《微机原理.docx（12页珍藏版）》请在冰豆网上搜索。

微机原理

课程：

微机原理与接口技术设计

一、设计题目及要求：

【课题3】 利用8259A 的IRQ4 显示中断过程

设计要求:

1．主程序是在七段数码管上从左到右循环显示“2015”。

2．通过8259A 的IRQ4 引脚上的中断请求进入中断服务程序：

⑴ 若第一次进入中断，6个数码管全部显示“1”，同时LED显示灯中第一个灯闪烁；

⑵ 若第二次进入中断，6个数码管全部显示“2”，同时LED显示灯中前两个灯闪烁；

......；

⑹ 若第六次进入中断，6个数码管全部显示“6”，同时LED显示灯的前六个灯闪烁；

⑺ 若第七次进入中断，数码管显示“1 LOOP”，同时 LED 显示灯的所有红灯闪烁。

此后若再有中断进入，从⑴开始下一轮循环。

三、功能流程图：

开始开始

关中断关中断

初始化显示缓冲区8259判断中断次数

开中断显示1个灯显示2个灯。

。

。

1loop亮全灯

循环显示2015中断返回

附录：

实验代码：

（完整的源程序）

CODESEGMENT

ASSUMECS:

CODE,DS:

CODE,ES:

CODE

ORG3400H

H8:

JMPP8259

ZXKEQU0FFDCH

ZWKEQU0FFDDH

PAEQU0FFD8H

PBEQU0FFD9H

PCEQU0FFDAH

PCTLEQU0FFDBH

LEDDB0C0H,0F9H,0A4H,0B0H,99H,92H,82H,0F8H,80H,90H

DB88H,83H,0C6H,0A1H,86H,8EH,0FFH,0CH,0DEH,0F3H,0C7H,8CH

BUFDB?

?

?

?

?

?

Port0EQU0FFE0H

Port1EQU0FFE1H

P8259:

H3:

MOVAL,88H

MOVDX,PCTL

OUTDX,AL

WP:

MOVAX,OFFSETINT8259

MOVBX,0030H

MOV[BX],AX

MOVBX,0032H

MOVAX,0000H

MOV[BX],AX

CALLFOR8259

movsi,0000h

STI

MOVBUF,02H;初始化显示2015

MOVBUF+1,00H

MOVBUF+2,01H

MOVBUF+3,05H

MOVBUF+4,10H

MOVBUF+5,10H

CALLSC

MOVBUF,10H;

MOVBUF+1,02H

MOVBUF+2,00H

MOVBUF+3,01H

MOVBUF+4,05H

MOVBUF+5,10H

CALLSC

MOVBUF,10H

MOVBUF+1,10H

MOVBUF+2,02H

MOVBUF+3,00H

MOVBUF+4,01H

MOVBUF+5,05H

CALLSC

MOVBUF,05H

MOVBUF+1,10H

MOVBUF+2,10H

MOVBUF+3,02H

MOVBUF+4,00H

MOVBUF+5,01H

CALLSC

MOVBUF,01H

MOVBUF+1,05H

MOVBUF+2,10H

MOVBUF+3,10H

MOVBUF+4,02H

MOVBUF+5,00H

CALLSC

MOVBUF,00H

MOVBUF+1,01H

MOVBUF+2,05H

MOVBUF+3,10H

MOVBUF+4,10H

MOVBUF+5,02H

CALLSC

JMPWP

SC:

MOVBP,80H

CON8:

CALLDIS

DECBP

CMPBP,00H

JNZCON8

W1:

MOVBX,05H

WH:

DECBX

PUSHCX

MOVCX,0FFFFH

LOOP$

POPCX

CMPBX,00H

JNZWH

RET

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

INT8259:

cli

MOVDI,0000H

MOVBX,OFFSETBUF

INCSI

WC:

MOV[BX+DI],SI

INCDI

CMPDI,06H

JNZWC

XX59:

MOVAL,20H

MOVDX,Port0

OUTDX,AL

movcx,0010h

xxx59:

pushcx

CMPSI,0001H

JNZP2

CALLT1

P2:

CMPSI,0002H

JNZP3

CALLT2

P3:

CMPSI,0003H

JNZP4

CALLT3

P4:

CMPSI,0004H

JNZP5

CALLT4

P5:

CMPSI,0005H

JNZP6

CALLT5

P6:

CMPSI,0006H

JNZP7

CALLT6

P7:

CMPSI,0007H

JNZS3

CALLT7

POPCX

CMPCX,01H

JNZG1

MOVSI,0000H

G1:

CALLWS

PUSHCX

S3:

MOVCX,20H

S1:

PUSHCX

CALLDIS

POPCX

LOOPS1

MOVDX,PB

MOVAL,0FFH

OUTDX,AL

MOVDX,PA

MOVAL,0FFH

OUTDX,AL

MOVCX,20H

S2:

PUSHCX

CALLDIS

POPCX

LOOPS2

popcx

DECCX

CMPCX,00H

JNZxxx59

popcx

movcx,3505h

pushcx

STI

IRET

;==============================

FOR8259:

MOVAL,13H

MOVDX,Port0

OUTDX,AL

MOVAL,08H

MOVDX,Port1

OUTDX,AL

MOVAL,09H

OUTDX,AL

MOVAL,0EFH;IRQ4

OUTDX,AL

RET

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

WS:

MOVBUF,01H;显示1loop

MOVBUF+1,10H

MOVBUF+2,14H

MOVBUF+3,00H

MOVBUF+4,00H

MOVBUF+5,15H

RET

T1:

MOVDX,PB

MOVAL,0F7H

OUTDX,AL

MOVDX,PA

MOVAL,0FFH

OUTDX,AL

RET

T2:

MOVDX,PB

MOVAL,0F3H

OUTDX,AL

MOVDX,PA

MOVAL,0FFH

OUTDX,AL

RET

T3:

MOVDX,PB

MOVAL,0F1H

OUTDX,AL

MOVDX,PA

MOVAL,0FFH

OUTDX,AL

RET

T4:

MOVDX,PB

MOVAL,0F0H

OUTDX,AL

MOVDX,PA

MOVAL,0FFH

OUTDX,AL

RET

T5:

MOVDX,PA

MOVAL,7FH

OUTDX,AL

INCDX

MOVAL,0F0H

OUTDX,AL

RET

T6:

MOVDX,PA

MOVAL,3FH

OUTDX,AL

INCDX

MOVAL,00H

OUTDX,AL

RET

T7:

MOVDX,PA

MOVAL,0B6H

OUTDX,AL

INCDX

MOVAL,0DH

OUTDX,AL

RET

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

DIS:

MOVCL,20H

MOVBX,OFFSETBUF

DIS1:

MOVAL,[BX]

PUSHBX

MOVBX,OFFSETLED

XLAT

POPBX

MOVDX,ZXK

OUTDX,AL

MOVAL,CL

MOVDX,ZWK

OUTDX,AL

PUSHCX

MOVCX,0100H

DELAY:

LOOP$

POPCX

CMPCL,01H

JZEXIT

INCBX

SHRCL,1

JMPDIS1

EXIT:

MOVAL,00H

MOVDX,ZWK

OUTDX,AL

RET

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

CODEENDS

ENDH8