topic Re: how to configure free running timer in HSC08 MCUs? in 8-bit Microcontrollers

how to configure free running timer in HSC08 MCUs?

senthilkumar — Fri, 06 Dec 2013 10:20:59 GMT

Hello,

Kindly help me,

How to configure free running timer for 1us?

How to find system frequency?

Re: how to configure free running timer in HSC08 MCUs?

Robinwithu — Fri, 06 Dec 2013 10:54:21 GMT

Hello Senthil,

Here is Timer configuration for Free running counter for S08RNA16/8/4 CONTROLLER .

FTM0_CNT = 0x0000; // The FTM Counter is Free Running Counter by Defining MODH:L=0x0000 or MODH:L=0xFFFF;

FTM0_MOD = 0xFFFF;

FTM0_SC = 0x0F; //CPWMS=0; Counter Mode;System Clock (Deafult) 16 Mhz, FEI mode Default, Prescaler Factor 1:128

Hope it will help you.

Regards

Robin

Re: how to configure free running timer in HSC08 MCUs?

senthilkumar — Fri, 06 Dec 2013 12:48:24 GMT

Hello Pradeep Singh,

Thank you for your reply, Please tell me where can I check system frequency?

Re: how to configure free running timer in HSC08 MCUs?

senthilkumar — Fri, 06 Dec 2013 13:39:37 GMT

Hello ,

How to configure my system frequency at 40 Mhz ?

Re: how to configure free running timer in HSC08 MCUs?

Robinwithu — Fri, 06 Dec 2013 13:59:36 GMT

Hello Senthil,

Here is System Frequency configuration for S08RNA16/8/4 CONTROLLER .

ICS_C1 = 0x04; // internal reference clock (31250to39250Hz) to FLL (512) and FLL is generating 16000-20000 Khz ; Ref. Freqeuncy is set at 31250-39250 Hz * 512 = Appx.16-20 Mhz

ICS_C2 = 0x00; // BDIV = 00, Freq is now 16-20Mhz

BDIV in Default case is ICS_C2=0x02 so the system frequency is in between 8 to 10 Mhz , but you can change the value of BDIV in ICS_C2=0x00 register as i changed above to zero, prescaler 1:1, it means that Your CPU frequency is now in between 16 to 20 Mhz depend on your Reference frequency multiplied by FLL (512).

But this is valid only for MC9S08RNA 16/8/4 type of controller Archt. In your case it may be different. can you tell me which controller you are using?

So i can check and tell you at wht freq. ur CPU is operting.

Regards

Robin

Re: how to configure free running timer in HSC08 MCUs?

senthilkumar — Sun, 08 Dec 2013 02:53:14 GMT

Hello Pradeep Singh,

My Controller is MC9S08SH8. Up to 40 MHz HCS08 CPU (20 MHz bus frequency) .I think default CPU frequency 20Mhz. Am I right?

Re: how to configure free running timer in HSC08 MCUs?

Robinwithu — Sun, 08 Dec 2013 18:39:50 GMT

Hello Senthil,

In your case it's between 16Mhz to 20Mhz

so here we go for detail explanation :

Internal reference Frequency is in between 31250Hz to 39625 HZ, which is multiplied with FLL value 1024 so

if Internal ref frequency is 31250 ,31250*1024 = 32Mhz and

if Internal ref frequency is 39625, 39625*1024 = 40Mhz

and the above frequency is than divided by your BDIV value which is in your Default case ICSC2= 0x40 ( Divide selected clock by 2)

so if you divide 32Mhz minimum or 40Mhz Maximum Internal Frequency by 2 you will get in between 16Mhz to 20Mhz. So it means you have to check your Internal reference Frequency.

if you are using Code warrior 10.x than please refer the following link to trimm the Internal Reference Frequency from 31250 Hz to 39625 Hz

https://community.freescale.com/docs/DOC-95356

Hope this will help you.

Regards,

Robin

Re: how to configure free running timer in HSC08 MCUs?

senthilkumar — Mon, 09 Dec 2013 16:17:56 GMT

Hello,

How to configure free running counter at 40 Mhz and how to find out each counting time?

Kindly give me related answer?

Re: how to configure free running timer in HSC08 MCUs?

Robinwithu — Mon, 09 Dec 2013 18:24:38 GMT

Hi Senthil,

Here is code which i Tested for free running counter configuration .This code toggles (On and OFF) the PORTA for half period of counter value i.e. 128.

code is working fine on PE full chip simulator.

Note: The CPU frequency is in Between 32Mhz to 40Mhz. it depends on your reference frequency so change it in your hardware programmer which is described in my previous comment link.

// prototypes

void main(void);

void COUNTER_Init(void);

void main(void) {

// EnableInterrupts;

/* include your code here */

ICSC2=0x00; // BDIV=0 (Bus Frequency is divided by one)

PTADD =0xFF; // Define Port A as output port

PTAD = 0x00; // Inilise PortA output to Zero

COUNTER_Init(); // Initilise the Counter

for(;;) {

// __RESET_WATCHDOG(); /* feeds the dog */

if (MTIMCNT>128){

PTAD = 0xFF;

}

else {

PTAD = 0x00;

}

void COUNTER_Init(void) {

MTIMCLK=0x00; // Bus clock (BUSCLK) is selected and Prescaler is zero

MTIMCNT=0x00; // Initilise your counter

MTIMMOD=0x00; // A value of 0x00 puts the MTIM in free-running mode

MTIMSC=0x00; // Start the Timer (TSTP=0 ; Timer start bit) after all above Configuration

}

I hope, this will help you.

Regards

Robin

Re: how to configure free running timer in HSC08 MCUs?

senthilkumar — Tue, 10 Dec 2013 05:39:57 GMT

Hello Pradeep Singh,

Please tell me How to configure this "ICSTRM" internal clock source register ?

the free running counter automatically hardware reset or we need to reset ?

Regrads,

Senthil

Re: how to configure free running timer in HSC08 MCUs?

Robinwithu — Tue, 10 Dec 2013 07:27:30 GMT

Hi Senthil,

There are two ways to reset your Free running counter

1) as soon as you write MTIMCNT=0x00; it will reset the counter and start counting from zero

2) when your Free Running counter overflow i.e. you have 8 bit counter and when MTIMCNT=0xFF;

Automatically in next cycle it will reset to zero , start counting from zero till 0xFF.

can you tell me which hardware you are using to program (Flash) your chip and also your code warrior version than i will tell you how to configure "ICSTRM" register.

One more thing is that above code is working have you tested that?

Regards

Robin

Re: how to configure free running timer in HSC08 MCUs?

senthilkumar — Tue, 10 Dec 2013 09:11:41 GMT

Hello Pradeep Singh,

I am using DEMO9S08SH8 development board and Code warrior version 6.3 .Above free running code working fine .

Thank you.

Regards,

Senthil

Re: how to configure free running timer in HSC08 MCUs?

Robinwithu — Tue, 10 Dec 2013 12:12:07 GMT

Hi Senthil,

I am using Codewarrior 10.5 so for me The location of the file "9s08sh8.s8p" is as follows

C:\Freescale\CW MCU v10.5\MCU\bin\plugins\support\HC08\gdi\P&E

for you may be it'S in "C:\Program Files\Freescale\CW06 V5.0\prog".

so find out first this file

and at position 10 you will get following line

09BIT_TRIM=004A/004B/01/FFAF/FFAE/001E8480/

The last eight digits 001E8480 has to do with triming. if you convert this value to decimal and multiply with 8 you will get 16Mhz which is Bus frequency and your Counter frequency is double of your Bus frequency cause of the changes in code.

to get 40Mhz Counter frequecy (DCLK) you need 20mhz bus frequency i changed it to 002625A0 ; but as i don't have debugger and programmer so i can't guarantee that's a correct value but u can try.in simulator i am getting bus frequency appx.23Mhz and Counter frequecy appx. 47Mhz which is wrong i know.

you can try it ...i am also trying as soon as i will get solution, will let you know and please tell me the result of above changes in file on controller may be their is some problem in simulator or my interpretation is wrong ...so please let me know the result.

one more, thing in your code add the following lines in place of // ICSTRM=0x50;

ICSTRM = *(unsigned char*)0xFFAE;

Happy programming :smileyhappy:

Regards

Robin

Re: how to configure free running timer in HSC08 MCUs?

senthilkumar — Tue, 10 Dec 2013 14:23:10 GMT

Hello ,

I am using DEMO9S08SH8 development board and Code warrior version 6.3. I wrote a LED blink code but not Not working. Please any one can upload LED Blink working code.

My LED Blink code is,

#include <hidef.h> /* for EnableInterrupts macro */

#include "derivative.h" /* include peripheral declarations */

#include "MC9S08SH8.h"

void main()

{

PTCDD_PTCDD0 = 1;

PTCDD_PTCDD1 = 1;

for(;;)

{

PTCD_PTCD0 = 1;

PTCD_PTCD1 = 1;

for(i=0;i<50000;i++);

PTCD_PTCD0 = 0;

PTCD_PTCD1 = 0;

for(i=0;i<50000;i++);

}

Re: how to configure free running timer in HSC08 MCUs?

Robinwithu — Tue, 10 Dec 2013 14:50:35 GMT

Hi Senthil,

Here is correction in your LED Code ,it's working fine

int i=0;

PTCDD =0xFF; // Define Port C as output port

PTCD = 0x00; // Inilise Port C output to Zero

for(;;)

{

for(i=0;i<50000;i++){

PTCD_PTCD0 = 1;

PTCD_PTCD1 = 1;

}

for(i=0;i<50000;i++)

{

PTCD_PTCD0 = 0;

PTCD_PTCD1 = 0;

}

Happy Progaming :smileyhappy:

Regards

Robin

Re: how to configure free running timer in HSC08 MCUs?

senthilkumar — Wed, 11 Dec 2013 05:19:47 GMT

Hello Robin,

Above that code also is not working. Please give me a working code.

Re: how to configure free running timer in HSC08 MCUs?

Robinwithu — Wed, 11 Dec 2013 08:02:40 GMT

Hi Senthil,

the problem is in "Int i" definition ,

cause "int i" varibale Range of decimal value is "-32768..+32767" as soon as you will change it to "unsigned int i " it's become 0..65535;

in for loop you have defined it I=50,000 which is greater than 32000

so either you can defined it "unsigned Int i" and try the code has to work or you can change the value in for loop instant of 50000 to 25000 .

The code must work.

Let me know after changes the code is working or not.

Regards

Robin

Re: how to configure free running timer in HSC08 MCUs?

senthilkumar — Wed, 11 Dec 2013 08:36:45 GMT

Hello Robin,

Hi LED code working fine . thank you.

I am using DEMO9S08SH8 development board and Code warrior version 6.3.

I have few questions,

1. I got example code for clock initialization at bus frequency 20 Mhz but How can i ensure that.

that code is,

ICSC1_CLKS = 0;

ICSC1_IREFS = 1;

ICSC1_RDIV = 0;

ICSC2_BDIV = 0;

ICSTRM = 0x58;

2. I have configured free running timer at bus frequency 20 Mhz and pres caller divider 256.

How to find out timing of each count ( I want know the counter incrementing time period)

freerunning code is,

Please any one help me.

MTIMCLK=0x08
MTIMCNT=0x00
MTIMMOD=0x00
MTIMSC=0x00;

Regards

Senthil

Re: how to configure free running timer in HSC08 MCUs?

Robinwithu — Wed, 11 Dec 2013 09:00:39 GMT

I sent you one message.please have look.

Regards,

Robin

Re: how to configure free running timer in HSC08 MCUs?

senthilkumar — Wed, 11 Dec 2013 15:53:55 GMT

Hello Robin,

With your great help, we were able to finally reach to the below working code:

void main(void)

{

UINT16 localCntr_25ms = 0;

UINT8 portToggle = 0;

SOPT1 = 0x03; // disbale watchdog

ICSC1_CLKS = 0; // TODO senthil

ICSC1_IREFS = 1;

ICSC1_RDIV = 0;

ICSC2_BDIV = 3; // 32MHz/8 => 4MHz, fsys is 4MHz and fbus = fsys/2 => 2MHz.

//ICSTRM = 0x96;

MTIMCLK=0x08; // Bus clock (BUSCLK) is selected and Prescaler is 256

MTIMCNT=0x00; // Initilise your counter

MTIMMOD=0x00; // A value of 0x00 puts the MTIM in free-running mode

MTIMSC=0x00; // Start the Timer (TSTP=0 ; Timer start bit) after all above Configuration

PTBDD_PTBDD7 = 1; // Define Port C as output port

SOPT1 = 0x03; // disbale watchdog

for(;;)

{

// with above settings, the MTIMCNT changes every 128us.

if (MTIMCNT > 200)

{

// 25.6ms

localCntr_25ms++;

// MTIMCNT = 0;

MTIMSC_TRST=1;

}

if (localCntr_25ms > 40)

{

// approx. 1000ms

portToggle++;

PTBD_PTBD7 = (portToggle & 0x01);

localCntr_25ms = 0;

}

Regards,

Senthil,