t2_m0_c.lst

This file is an example to use timer2 in mode 0.

C51 COMPILER V7.06   T2_M0_C                                                               04/15/2004 16:12:55 PAGE 1   


C51 COMPILER V7.06, COMPILATION OF MODULE T2_M0_C
OBJECT MODULE PLACED IN t2_m0_c.OBJ
COMPILER INVOKED BY: C:\KEIL\C51\BIN\C51.EXE t2_m0_c.c BROWSE DEBUG OBJECTEXTEND TABS(3)

stmt level    source

   1          /**
   2           * @file $RCSfile: t2_m0_c.c,v $
   3           *
   4           * Copyright (c) 2004 Atmel.
   5           *
   6           * Please read file license.txt for copyright notice.
   7           *
   8           * @brief This file is an example to use timer2 in mode 0.
   9           *
  10           * This file can be parsed by Doxygen for automatic documentation
  11           * generation.
  12           * Put here the functional description of this file within the software
  13           * architecture of your program.
  14           *
  15           * @version $Revision: 1.0.0 $ $Name:  $
  16           */
  17          /*_____ M A C R O S ________________________________________________________*/
  18          
  19          /**
  20           * This is a macro local to this file .
  21           */
  22          #define MSB_reload_value 0x36 /* msb reload value exemple */
  23          #define LSB_reload_value 0x36 /* lsb reload value exemple */
  24          
  25          
  26          /* @section  I N C L U D E S */
  27          #include "reg_c51.h"
  28          
  29          
  30          /**
  31           * FUNCTION_PURPOSE: This file set up timer 2 in mode 0 (16 bits auto-reload
  32           * up/down counter).
  33           * The 16-bits register consist of all 8 bits of TH2 and all 8 bits   
  34           * of TL2. The EXF2 bit toggles when timer2 overflow or underflow occurs.
  35           * EXF2 does not generate interrupt. This bit can be used to provide 17-bit resolution   
  36           * FUNCTION_INPUTS: P1.0(T2) must be controlled by an external clock 
  37           *                  P1.1(T2EX)=0 for down counting or 1 for up counting.
  38           * FUNCTION_OUTPUTS: void
  39           */
  40          void main(void)
  41          {
  42   1      T2MOD &= 0xFC;             /* T2OE=0;DCEN=1; */
  43   1      T2MOD |= 0x01;             
  44   1      
  45   1      EXF2=0;                    /* reset flag */
  46   1      TCLK=0;RCLK=0;             /* disable baud rate generator */
  47   1      EXEN2=0;                   /* ignore events on T2EX */ 
  48   1      TH2=MSB_reload_value;      /* Init msb_value */
  49   1      TL2=LSB_reload_value;      /* Init lsb_value */
  50   1      RCAP2H=MSB_reload_value;   /* reload msb_value */
  51   1      RCAP2L=LSB_reload_value;   /* reload lsb_value */
  52   1      C_T2=1;                    /* counter mode */
  53   1      CP_RL2=0;                  /* reload mode */
  54   1      EA=1;                      /* interupt enable */
  55   1      ET2=1;                     /* enable timer2 interrupt */
C51 COMPILER V7.06   T2_M0_C                                                               04/15/2004 16:12:55 PAGE 2   

  56   1      TR2=1;                     /* timer2 run */
  57   1      
  58   1      while(1);                  /* endless  */
  59   1      }
  60          
  61          
  62          /**
  63           * FUNCTION_PURPOSE: timer2 interrupt
  64           * FUNCTION_INPUTS: void
  65           * FUNCTION_OUTPUTS: P1.2 toggle period = 2 * (65536-reload_value) * P1.0(T2) period 
  66           */
  67          void it_timer2(void) interrupt 5 /* interrupt address is 0x002b */
  68          {
  69   1         P1_2 = ~P1_2;              /* P1.2 toggle when interrupt. */
  70   1         TF2 = 0;                   /* reset interrupt flag */
  71   1      }


MODULE INFORMATION:   STATIC OVERLAYABLE
   CODE SIZE        =     43    ----
   CONSTANT SIZE    =   ----    ----
   XDATA SIZE       =   ----    ----
   PDATA SIZE       =   ----    ----
   DATA SIZE        =   ----    ----
   IDATA SIZE       =   ----    ----
   BIT SIZE         =   ----    ----
END OF MODULE INFORMATION.


C51 COMPILATION COMPLETE.  0 WARNING(S),  0 ERROR(S)