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AT89S52 external clock

Hi,

I'd like to output my data stored in an array in MCU AT89S52 by a frequency 1MHz,
which means output a series data bit by bit every 1/1M second.

How can I generate a 1M clock or input a 1M clock?
Hoe can I output the data bit by bit every 1/1M second?

Any suggestion for these by C51 uvision4 compiler?

Thanks.

Parents

0 GB CC over 7 years ago in reply to GB CC

I'v fixed my code. There's no error now, but the result isn't right.

NO data has outputed from Pin1.3

Anything wrong here?

#include <AT89X52.H>
#include <stdio.H>


sbit dataIN = P1^3;      //Output


volatile char Data = 0xAA;

void ex0_isr(void) interrupt 0
{
      if ((Data & 0x80) == 0)
            dataIN = 0;
          else
                dataIN = 1;

          Data<<=1;
}



void main()
{
  IT0 = 1;   //  falling edge on /INT0 (P3.2)
  EX0 = 1;   //  Enable EX0 Interrupt
  EA = 1;        // Enable Global Interrupt Flag


}

Reply

0 GB CC over 7 years ago in reply to GB CC

I'v fixed my code. There's no error now, but the result isn't right.

NO data has outputed from Pin1.3

Anything wrong here?

#include <AT89X52.H>
#include <stdio.H>


sbit dataIN = P1^3;      //Output


volatile char Data = 0xAA;

void ex0_isr(void) interrupt 0
{
      if ((Data & 0x80) == 0)
            dataIN = 0;
          else
                dataIN = 1;

          Data<<=1;
}



void main()
{
  IT0 = 1;   //  falling edge on /INT0 (P3.2)
  EX0 = 1;   //  Enable EX0 Interrupt
  EA = 1;        // Enable Global Interrupt Flag


}

Children

0 Andy Neil over 7 years ago in reply to GB CC

http://www.keil.com/forum/62462
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