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13 Threads found on edaboard.com: Timer Value Calculation

## How is he doing the calculation ?

How is he doing the timer2 calculation ? He is using a 16 MHz Clock and 16 KHz PWM signal and his timer2 interrupt value is 62.5 us. TPWM = 62.5 us. Is he using TPWM = 1 / 16000 = 62.5 us for timer2 Interrupt ? If yes, If my PWM frequency is 10 KHz should I use

## Timer calculation in any microcontroller.

Hi, Please let me know the basic timer value calculation in any microcontroler. Always i find difficult in timer calculation. For example you take for 1 msec , crystal is 8MHz. prescalar is 1:4

## using 10bits ADC result with 16bits timer result

Problem statement i'm using 10bit ADC to measure the voltage on potentiometer (real angle of rotation of a DC motor, which varies from -45° to +45° or 0° to 90°). i'm using 16bit timer to measure the width of a square signal (desired angle of rotation of the DC motor, which varies from 1ms to 2ms like RC servos). i want use integer

## need help about saving and retrieving the W reg during interrupt handling in assembly

urgent help is needed please i am facing the problem that in my software (in assembly language). i am using timer interrupt in 16f72. there is some calculation which is done by w reg. during calculation, when timer interrupt occurs, the value of w reg is disturbed. when w reg goes to work for (...)

## input capture in arm7

I am still learning LPC2148 hence can't give you code. Process is. make trig pin high then a delay of 10 us then make trig pin low clear 16 bit timer wait till echo pin goes high when echo pin goes high start timer wait till echo pin goes low when echo pin goes low stop timer use timer value and do (...)

## PWM wave generation........

hi guys,i have a problem regarding pwm wave generation.i want to generate a 770hz pwm with 10%duty cycle on timer 2(atmega8) ,crystl is my TCNT value s 0x5D,and OCR is 0x6D according to my proteus shows generated signal is pls help me finding the problem.thnx...

## method regarding calculation of off & on time of relay

What is the PIC clock frequency? Which timer is used? In what mode is the timer used? What is the re-load value? Please read the PIC manual

## Timer calculation for 89s52

You may find the theory here 8051 Tutorial: timers - To calculate required value here 8051 Microcontroller Peripheral Timing Calculator

## timer prescaler calculation

hiiii i want to calculate the prescaler value for the following 16-bit timers to generate a 1us tick and the controller is running at 50mhz. i am using LM3S811 stellaris uc. in the datasheet it explain like this ... but i dnt understand how the Mx time to be calculated.... All values assume a 50-MHz clock with Tc=20 ns (cloc

## pwm calculation error

Pwm period = x 4 x 20Mhz x Time prescale value You need the period of the oscillator, Should be Pwm period = x 4 x 1/20Mhz x timer prescale value. You wont be able to go down to 50Hz using a 20MHz clock! Even with the prescale at max, you could only go down to ~1K2. 50Hz is quite slow, you could implement your squar

## HELP: Speed calculation from PWM signal...

The capture input and timer will allow you to know the time between two rising fronts of the signal, for example. This time will be a multiple of the CPU clock period. All you need to do is invert this value and then multiply it by whatever gain required by your system. You might want to read about fixed point math for this. For example if one pe

## converting value in TMR1H & TMR1L into hours (PIC16F877A

The problem is this: The time is calculated using timer 1 in PIC16F877A microcontroller. The measured value is stored in the TMR1H & TMR1L registers. I have this value now in an int variable. I need to convert this value to hours since we need to do our calculation in km/h. It involves using clock_khz() (...)