text1.c

protues编的数字电压表

#include <reg52.h>

extern delay(unsigned int);

main(void)
{
	while(1)
	{
		P3=0xff;
		P2=0x3f;
		P3=0xfe;
		delay(100);

		P3=0xff;
		P2=0x06;
		P3=0xfd;
		delay(100);

		P3=0xff;
		P2=0x3f;
		P3=0xfb;
		delay(100);

		P3=0xff;
		P2=0x3f;
		P3=0xf7;
		delay(100);

		P3=0xff;
		P2=0x3f;
		P3=0xef;
		delay(100);

		P3=0xff;
		P2=0x3f;
		P3=0xdf;
		delay(100);

		P3=0xff;
		P2=0x3f;
		P3=0xbf;
		delay(100);

		P3=0xff;
		P2=0x3f;
		P3=0x7f;
		delay(100);

	}

}

delay(unsigned int t)
{
	while(--t);
}