430单片机多功能时钟

void delayms(uint z)
{
     uchar i;
     while(z--)
        for(i=0;i<250;i++)
        {
             _NOP();_NOP();_NOP();_NOP();
        }
}

void write_command(uchar cmd)
{
     RS_L;
     RW_L;
     EN_L;
     P4OUT=cmd;
     delayms(1);
     EN_H;
     delayms(1);
     EN_L;
}

void write_data(uchar dat)
{
     RS_H;
     RW_L;
     EN_L;
     P4OUT=dat;
     delayms(1);
     EN_H;
     delayms(1);
     EN_L;
}

void LCD_Init(void)
{
     P4DIR=0xff;
     P5DIR=0x0f;
     PSB_H;
     write_command(0x30);delayms(5);
     write_command(0x0c);delayms(5);
     write_command(0x01);delayms(5);
     write_command(0x06);delayms(5);
}

void set_pos(uchar addr,uchar x)
{
     x&=0x07;
     write_command(addr+x);
}