S12 / MagniV MicrocontrollersのトピックHow to configure timer to generate 1 ms .Help me with a sample code for MC9S12ZVCRMV1 16 bit controller.

How to configure timer to generate 1 ms .Help me with a sample code for MC9S12ZVCRMV1 16 bit controller.

sathishkannan — Tue, 03 Nov 2015 07:36:56 GMT

I need step by step instruction to configure register for timer and generate delay of 1 ms .Please explain to see the delay in debugger.

Re: How to configure timer to generate 1 ms .Help me with a sample code for MC9S12ZVCRMV1 16 bit controller.

lama — Tue, 03 Nov 2015 10:38:35 GMT

Hi,

Easily in the attached project you can find an example for 250ms period. The definition of value TIM0_TC0_INCREMENT defines period of TC0 interrupt. If you require anothe period just recalculate on the basis of you BUSCLK.

period = (PRS+1)* TIM0_TC0_INCREMENT/ BUSCLK =

= 250 * BUSCLK*1000 / BUSCLK = 250,000 us = 0.25s

Of course the project contains more examples on different peripherals but you should look only for TIM0_Channel0_ISR, TIM0_Init (TIM0.c, TIM0.h) and possible principle of interrupt functions definition in the InterruptVectorTable.c

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

#pragma CODE_SEG NON_BANKED

/* added -ansi off to compiler option; Project->Properties->Compiler->General*/

interrupt void TIM0_Channel0_ISR(void) // vector defined in the prm file

{

TIM0TC0 = TIM0TCNT + TIM0_TC0_INCREMENT;

TIM0TFLG1 = 0B00000001; // clear flag from channel 0

PTS_PTS4 = ~PTS_PTS4; // do anything

}

#pragma CODE_SEG DEFAULT

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

Function Name : TIM0_Init

Engineer : xxxx

Date : Dec-14-2013

Parameters : NONE

Modifies : TIM0 setup registers

Returns : NONE

Notes : period 0.25sec

period = (PRS+1)* TIM0_TC0_INCREMENT/ BUSCLK =

= 250 * BUSCLK*1000 / BUSCLK = 250,000 us = 0.25s

Issues : NONE

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

void TIM0_Init(void)

{

SET_INTERRUPT_PRIORITY(TIM0_Channel0_VEC_OFF, 3); // priority 3 FOR TIM_CH0 OC

TIM0TIOS = 0B00000001; // Channel0 output compare

TIM0TCTL2 = 0B00000000; // no output compare action at pin

TIM0TFLG1 = 0B11111111; // clear all flags

TIM0TIE = 0B00000001; // enable OC from Channel0

TIM0PTPSR = 249; // prescaler 250

TIM0TC0 = TIM0TCNT + TIM0_TC0_INCREMENT;

TIM0TSCR1 = 0B11101000; // Timer enable, stop in wait and BDM mode,

// no fast flag clear, precise prescaler

}

Best regards,

Ladislav

Re: How to configure timer to generate 1 ms .Help me with a sample code for MC9S12ZVCRMV1 16 bit controller.

sathishkannan — Thu, 05 Nov 2015 11:45:03 GMT

Hi,

I got 1 ms delay .

derive me the calculation and explanation how i got 1 ms delay.

busclock =16 Mhz

TIM0_TC0_INCREMENT=10000

prescaler=16

Is it correct or I am getting by mistake ?

Re: How to configure timer to generate 1 ms .Help me with a sample code for MC9S12ZVCRMV1 16 bit controller.

lama — Tue, 10 Nov 2015 15:20:26 GMT

Hi,

period = (PRS+1)* TIM0_TC0_INCREMENT/ BUSCLK

TIM0_TC0_INCREMENT = period * BUSCLK / (PRS+1) = 0.001 * 16,000,000 / (15 + 1) = 1000 [ -; s, MHz, -]

TIM0_TC0_INCREMENT = 1000

TIM0PTPSR = 15

Best regards,

Ladislav

Re: How to configure timer to generate 1 ms .Help me with a sample code for MC9S12ZVCRMV1 16 bit controller.

sathishkannan — Wed, 11 Nov 2015 04:08:26 GMT

Hi,

As per your calculcation you are passing TIM0_TC0_INCREMENT = 1000,but in my program i am passing as 10000 and prescaler as 16 .whats wrong with it ?