去年我在Atmel官网下载的8051例子，分享

只看该作者 · 2023-8-16 15:23

不知道从何时开始，Atmel官网没了，再也找不到那些相关的资源了。翻看了我的下载记录，找到了几个8051的官方例子，分享过来。

#include <reg52.h>

#include <stdio.h>



/*------------------------------------------------

Timer 2 Interrupt Service Routine.



Set a breakpoint on 'overflow_count++' and run the

program in the debugger.  You will see this line

executes every 1000 clock cycles (or 1,000 Hz).



So, overflow_count is actually a 1/1,000 sec

timer.

------------------------------------------------*/

static unsigned long overflow_count = 0;



void timer1_ISR (void) interrupt 5

{

TF2 = 0;            /* Clear the interrupt request */

overflow_count++;   /* Increment the overflow count */

}



/*------------------------------------------------

MAIN C function

------------------------------------------------*/

void main (void)

{

/*--------------------------------------

Set Timer2 for 16-bit auto-reload.

The timer counts to 0xFFFF, overflows,

is reloaded, and generates an interrupt.

--------------------------------------*/

T2CON = 0x80;                /* 10000000 */



/*--------------------------------------

Set the reload values to be 1000 clocks.

--------------------------------------*/

RCAP2L = (65536UL-1000UL);

RCAP2H = (65536UL-1000UL) >> 8;



TL2 = RCAP2L;

TH2 = RCAP2H;



/*--------------------------------------

--------------------------------------*/

ET2 = 1;                      /* Enable Timer 2 Interrupts */

TR2 = 1;                      /* Start Timer 2 Running */

EA = 1;                       /* Global Interrupt Enable */



/*--------------------------------------

Do Nothing.  Actually, the timer 2

interrupt will occur every 1000 clocks.

Since the oscillator runs at 12 MHz,

the interrupt will happen every 1 KHz.

--------------------------------------*/

while (1)

  {

  }

}

只看该作者 · 2023-8-16 15:24

复制

sfr P1 = 0x90;          /* SFR definition for Port 1 */

sfr P3 = 0xB0;          /* SFR definition for Port 3 */



/*------------------------------------------------

MAIN C Function

------------------------------------------------*/

void main (void)

{

unsigned char pval;     /* temp variable for port values */



P1 = 0xFF;              /* Setup P1 for Input */



/*--------------------------------------

Use the Toolbox buttons in the debugger

to change the value of P1.  Open the

Port 1 and Port 3 dialogs from the

Peripherals Menu to view their status.

--------------------------------------*/

while (1)

  {

  pval = P1;            /* Read P1 into pval */

  P3 = pval;            /* Write pval to P3 */

  }

}

只看该作者 · 2023-8-16 15:24

复制

#include <REG52.H>



/*=============================================================================

=============================================================================*/

unsigned char ex0_isr_counter = 0;



void ex0_isr (void) interrupt 0

{

ex0_isr_counter++;   // Increment the count

}



/*=============================================================================

=============================================================================*/

void main (void)

{



/*-----------------------------------------------

Configure INT0 (external interrupt 0) to generate

an interrupt on the falling-edge of /INT0 (P3.2).

Enable the EX0 interrupt and then enable the

global interrupt flag.

-----------------------------------------------*/

IT0 = 1;   // Configure interrupt 0 for falling edge on /INT0 (P3.2)

EX0 = 1;   // Enable EX0 Interrupt

EA = 1;    // Enable Global Interrupt Flag



/*-----------------------------------------------

Wait forever.

-----------------------------------------------*/

while (1)

  {

  }

}



/*=============================================================================

=============================================================================*/

只看该作者 · 2023-8-16 15:24

复制

/*-----------------------------------------------------------------------------

Definitions for P1 (8 bits), P1.0, and P1.1.

-----------------------------------------------------------------------------*/

sfr P1 = 0x90;        /* SFR for P1 */



sbit P1_0 = P1^0;     /* SFR for P1.0 */

sbit P1_1 = P1^1;     /* SFR for P1.1 */



/*-----------------------------------------------------------------------------

MAIN C function

-----------------------------------------------------------------------------*/

void main (void)

{

P1_0 = 1;                  /* Configure P1.0 as an input */



/*-----------------------------------------------

This loop reads P1.0 and writes the value read

to P1.1.



Open the Port 1 Dialog from the Peripherals Menu

and change the value of the P1.0 Pin.  When you

set P1.0 LO, P1.1 outputs LO.  When you set 

P1.0 HI, P1.1 outputs HI.

-----------------------------------------------*/

while (1)

  {

  P1_1 = P1_0;            /* Copy P1.0 to P1.1 */

  }

}



/*-----------------------------------------------------------------------------

-----------------------------------------------------------------------------*/

只看该作者 · 2023-8-16 15:25

如果谁有齐全的官方例子，可以分享过来。

只看该作者 · 2023-8-18 11:34

齐全的官方例子有点难搞啊