• State Not Answered
  • Locked Locked
  • Replies 6 replies
  • Subscribers 21 subscribers
  • Views 1773 views
  • Users 0 members are here
2025 survey

We are running a survey to help us improve the experience for all of our members. If you see the survey appear, please take the time to tell us about your experience if you can.

Options
Related
How was your experience today?
This discussion has been locked.
You can no longer post new replies to this discussion. If you have a question you can start a new discussion

AT89S52 external clock

GB CC

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 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 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