Machine cycle of MC9S12XHZ512 micro-controller.

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Machine cycle of MC9S12XHZ512 micro-controller.

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kdn
Contributor III

How can I calculate machine cycle of MC9S12XHZ512 micro-controller.

 

I want to create time delay in MC9S12XHZ512 micro-controller using Timer, I have used 16MHz crystal on my micro-controller board with no prescale, Can someone explain me how can I calculate delay of 1ms if I am using 16-bit Timer.

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lama
NXP TechSupport
NXP TechSupport

Here is an example for similar MCU with a lot of description:

/*******************************************************************************

* Freescale Semiconductor Inc.

* (c) Copyright 2004-2005 Freescale Semiconductor, Inc.

* ALL RIGHTS RESERVED.

********************************************************************************

Services performed by FREESCALE in this matter are performed AS IS and without

any warranty. CUSTOMER retains the final decision relative to the total design

and functionality of the end product. FREESCALE neither guarantees nor will be

held liable by CUSTOMER for the success of this project.

FREESCALE DISCLAIMS ALL WARRANTIES, EXPRESSED, IMPLIED OR STATUTORY INCLUDING,

BUT NOT LIMITED TO, IMPLIED WARRANTY OF MERCHANTABILITY OR FITNESS FOR

A PARTICULAR PURPOSE ON ANY HARDWARE, SOFTWARE OR ADVISE SUPPLIED TO THE PROJECT

BY FREESCALE, AND OR NAY PRODUCT RESULTING FROM FREESCALE SERVICES. IN NO EVENT

SHALL FREESCALE BE LIABLE FOR INCIDENTAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF

THIS AGREEMENT.

CUSTOMER agrees to hold FREESCALE harmless against any and all claims demands or

actions by anyone on account of any damage, or injury, whether commercial,

contractual, or tortuous, rising directly or indirectly as a result of an advise

or assistance supplied CUSTOMER in connection with product, services or goods

supplied under this Agreement.

********************************************************************************

* File      main.c

* Owner     r62780

* Version   1.0

* Date      Sep-15-2010

* Classification   General Business Information

* Brief     FLASH E/W

********************************************************************************

* Detailed Description:

*

* - the SW software demonstrates one of the possibilities how to generate SW

    delay by means of ECT.

* - Generates only one impulse given length after the delay of given length  

* - The hard delay, which means the CPU does not work on another task, is presented.

*   It waits in loop.

*

* - Theory:

*

* interval = TCx * dt = TCx * (prescaler/fbus)

* TCx = interval / (prescaller/fbus) = interval * fbus / prescaler

* There are two ways for TCx and prescaler setup:

* 1) prescaler = constant (min and max interval is given)

* 2) prescaler and TCx are considered as a variables to calculate required interval

*    interval = f(TCx, prescaler)

*    this solution is more difficult

*

*

* This example solves item 1.

*    - Prescaler = const = 8.

*    - fbus = 8MHz

*        - TCx = interval / (prescaller/fbus) = interval * fbus / prescaler

*

*         Max interval can be calculated as interval[us]=65535*prescaler/fbus[MHz]

*     and setup precision is dt=prescaler/fbus

*

*     for fbus = 8MHz

*     If prescaler =   1 then max interval is   8191.8 us; dt =  0.125 us

*     If prescaler =   2 then max interval is  16383,7 us; dt =  0.250 us

*     If prescaler =   4 then max interval is  32767,5 us; dt =  0.500 us

*     If prescaler =   8 then max interval is  65535   us; dt =  1.000 us

*     If prescaler =  16 then max interval is  131070  us; dt =  2.000 us

*     If prescaler =  32 then max interval is  262140  us; dt =  4.000 us

*     If prescaler =  64 then max interval is  524280  us; dt =  8.000 us

*     If prescaler = 128 then max interval is 1048560  us; dt = 16.000 us

*    

* - tested on: HCS12X STARTER KIT

*   - OSCCLK = 16MHz, BUSCLK = 8MHz

*   - Reference to documentation: MC9S12XDP512V2 Rev.2.17

********************************************************************************

Revision History:

Version  Date         Author  Description of Changes

1.0      Sep-15-2010  R62780  Initial version

*******************************************************************************/

#include <hidef.h>              // common defines and macros

#pragma LINK_INFO DERIVATIVE "mc9s12xdp512"

#include "map.h"

/*******************************************************************************

* Local function prototypes

*******************************************************************************/

static void Delay(UWORD interval);

static void ECT_Init(void);

/*******************************************************************************

* Local variables

*******************************************************************************/

// NONE

/*******************************************************************************

Function Name : ECT_Init

Engineer      : r62780

Date          : Sep/15/2010

Parameters    : NONE

Modifies      : NONE

Returns       : NONE

Notes         : Sets ECT for required functionality

Issues        : NONE

*******************************************************************************/

static void ECT_Init(void)

{

  TSCR2 = 0x03;                        // prescaller = 8

  //--- channel 0 setup ---------------

  TCTL1 = 0x00;                        // timer disconnected form output pin logic

  TIOS  = 0x01;                        // channels 0 is output compare

  //-----------------------------------

  TIE_C0I = 0;                         // disable interrupt from channel 0

  //-----------------------------------

  TSCR1 = 0xF0;                        // enable timer,stop in wait,stop in freeze, fast flag clear

}

/*******************************************************************************

Function Name : Delay

Engineer      : r62780

Date          : Sep/15/2010

Parameters    : UWORD interval

Modifies      : NONE

Returns       : NONE

Notes         : Performs hard delay

Issues        : NONE

*******************************************************************************/

static void Delay(UWORD interval)

{

TC0 = TCNT + interval;                // set new value and clear interrupt flag 

                                       // TC0 = t + interval * fbus / prescaler;

while(!TFLG1_C0F);

   

}

/*******************************************************************************

Function Name : main

Engineer      : r62780

Date          : Sep/15/2010

Parameters    : NONE

Modifies      : NONE

Returns       : NONE

Notes         : Demonstrate SW delay

Issues        : NONE

*******************************************************************************/

void main(void)

{

for(;;)

  {

   //----------------------------------

   ECT_Init();

   //----------------------------------

   DDRB=0xFF;                          // an output port to visualize period

   //----------------------------------

   for(;;)

     {

       Delay(10000);                   // true delay is value 500*prescaller/busclk=

                                       // = 10000*8/8MHz = 10000us = 10ms

       PORTB = ~PORTB;

     }

  }

}

/*******************************************************************************

The Answer to the Ultimate Question of Life, the Universe, and Everything is:.......... 42.

(Douglas Adams - The Hitchhiker's Guide to the Galaxy)

*******************************************************************************/

View solution in original post

0 Kudos
1 Reply
49 Views
lama
NXP TechSupport
NXP TechSupport

Here is an example for similar MCU with a lot of description:

/*******************************************************************************

* Freescale Semiconductor Inc.

* (c) Copyright 2004-2005 Freescale Semiconductor, Inc.

* ALL RIGHTS RESERVED.

********************************************************************************

Services performed by FREESCALE in this matter are performed AS IS and without

any warranty. CUSTOMER retains the final decision relative to the total design

and functionality of the end product. FREESCALE neither guarantees nor will be

held liable by CUSTOMER for the success of this project.

FREESCALE DISCLAIMS ALL WARRANTIES, EXPRESSED, IMPLIED OR STATUTORY INCLUDING,

BUT NOT LIMITED TO, IMPLIED WARRANTY OF MERCHANTABILITY OR FITNESS FOR

A PARTICULAR PURPOSE ON ANY HARDWARE, SOFTWARE OR ADVISE SUPPLIED TO THE PROJECT

BY FREESCALE, AND OR NAY PRODUCT RESULTING FROM FREESCALE SERVICES. IN NO EVENT

SHALL FREESCALE BE LIABLE FOR INCIDENTAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF

THIS AGREEMENT.

CUSTOMER agrees to hold FREESCALE harmless against any and all claims demands or

actions by anyone on account of any damage, or injury, whether commercial,

contractual, or tortuous, rising directly or indirectly as a result of an advise

or assistance supplied CUSTOMER in connection with product, services or goods

supplied under this Agreement.

********************************************************************************

* File      main.c

* Owner     r62780

* Version   1.0

* Date      Sep-15-2010

* Classification   General Business Information

* Brief     FLASH E/W

********************************************************************************

* Detailed Description:

*

* - the SW software demonstrates one of the possibilities how to generate SW

    delay by means of ECT.

* - Generates only one impulse given length after the delay of given length  

* - The hard delay, which means the CPU does not work on another task, is presented.

*   It waits in loop.

*

* - Theory:

*

* interval = TCx * dt = TCx * (prescaler/fbus)

* TCx = interval / (prescaller/fbus) = interval * fbus / prescaler

* There are two ways for TCx and prescaler setup:

* 1) prescaler = constant (min and max interval is given)

* 2) prescaler and TCx are considered as a variables to calculate required interval

*    interval = f(TCx, prescaler)

*    this solution is more difficult

*

*

* This example solves item 1.

*    - Prescaler = const = 8.

*    - fbus = 8MHz

*        - TCx = interval / (prescaller/fbus) = interval * fbus / prescaler

*

*         Max interval can be calculated as interval[us]=65535*prescaler/fbus[MHz]

*     and setup precision is dt=prescaler/fbus

*

*     for fbus = 8MHz

*     If prescaler =   1 then max interval is   8191.8 us; dt =  0.125 us

*     If prescaler =   2 then max interval is  16383,7 us; dt =  0.250 us

*     If prescaler =   4 then max interval is  32767,5 us; dt =  0.500 us

*     If prescaler =   8 then max interval is  65535   us; dt =  1.000 us

*     If prescaler =  16 then max interval is  131070  us; dt =  2.000 us

*     If prescaler =  32 then max interval is  262140  us; dt =  4.000 us

*     If prescaler =  64 then max interval is  524280  us; dt =  8.000 us

*     If prescaler = 128 then max interval is 1048560  us; dt = 16.000 us

*    

* - tested on: HCS12X STARTER KIT

*   - OSCCLK = 16MHz, BUSCLK = 8MHz

*   - Reference to documentation: MC9S12XDP512V2 Rev.2.17

********************************************************************************

Revision History:

Version  Date         Author  Description of Changes

1.0      Sep-15-2010  R62780  Initial version

*******************************************************************************/

#include <hidef.h>              // common defines and macros

#pragma LINK_INFO DERIVATIVE "mc9s12xdp512"

#include "map.h"

/*******************************************************************************

* Local function prototypes

*******************************************************************************/

static void Delay(UWORD interval);

static void ECT_Init(void);

/*******************************************************************************

* Local variables

*******************************************************************************/

// NONE

/*******************************************************************************

Function Name : ECT_Init

Engineer      : r62780

Date          : Sep/15/2010

Parameters    : NONE

Modifies      : NONE

Returns       : NONE

Notes         : Sets ECT for required functionality

Issues        : NONE

*******************************************************************************/

static void ECT_Init(void)

{

  TSCR2 = 0x03;                        // prescaller = 8

  //--- channel 0 setup ---------------

  TCTL1 = 0x00;                        // timer disconnected form output pin logic

  TIOS  = 0x01;                        // channels 0 is output compare

  //-----------------------------------

  TIE_C0I = 0;                         // disable interrupt from channel 0

  //-----------------------------------

  TSCR1 = 0xF0;                        // enable timer,stop in wait,stop in freeze, fast flag clear

}

/*******************************************************************************

Function Name : Delay

Engineer      : r62780

Date          : Sep/15/2010

Parameters    : UWORD interval

Modifies      : NONE

Returns       : NONE

Notes         : Performs hard delay

Issues        : NONE

*******************************************************************************/

static void Delay(UWORD interval)

{

TC0 = TCNT + interval;                // set new value and clear interrupt flag 

                                       // TC0 = t + interval * fbus / prescaler;

while(!TFLG1_C0F);

   

}

/*******************************************************************************

Function Name : main

Engineer      : r62780

Date          : Sep/15/2010

Parameters    : NONE

Modifies      : NONE

Returns       : NONE

Notes         : Demonstrate SW delay

Issues        : NONE

*******************************************************************************/

void main(void)

{

for(;;)

  {

   //----------------------------------

   ECT_Init();

   //----------------------------------

   DDRB=0xFF;                          // an output port to visualize period

   //----------------------------------

   for(;;)

     {

       Delay(10000);                   // true delay is value 500*prescaller/busclk=

                                       // = 10000*8/8MHz = 10000us = 10ms

       PORTB = ~PORTB;

     }

  }

}

/*******************************************************************************

The Answer to the Ultimate Question of Life, the Universe, and Everything is:.......... 42.

(Douglas Adams - The Hitchhiker's Guide to the Galaxy)

*******************************************************************************/

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