单片机重点作业题答案整理(18)

LOOP： JNB TI，LOOP MOV A，R2

MOV SBUF，A

LOOP1：JNB TI，LOOP1

SETB P1.0 ACALL DELAY CLR TI CLR C MOV A，R2 RLC A MOV R2，A MOV A，R3 RLC A MOV R3，A CLR P1.0

DJNZ R4，START1 SJMP MAIN

DELAY：MOV R7，#05H LOOP2：MOV R6，#0FFH LOOP1：DJNZ R6，LOOP1

DJNZ R7，LOOP2 RET END

C语言程序：

#include <reg51.h>

void delay(unsigned int x); union {

unsigned int word;

struct{unsigned char high;unsigned char low;}bytes; }number;

void main() {

int i; SCON=0x00;

while(1) {

number.word=0x01; for (i=0;i<16;i++)

{SBUF=number.bytes.low; while(!TI); TI=0;

SBUF=number.bytes.high; while(!TI); TI=0;

delay(10);

number.word=number.word*2; } }