What is Postscaler?
What is Postscaler?
The postscaler is used to extend the time period that a timer can generate. If you set the postscaler to 4 for example you will get four times the timeperiod the timer can generate normally. I use this often to get a lower frequency of an interrupt for example.
What is a prescaler in pic?
Prescaler Rate A prescaler divides down the clock signals used for the timer, giving reduced overflow rates. The rate can be set to a number of possible values. The exact values are chip-dependent; e.g., for the PIC16F877A values area a number of values are available ranging from 1:1 to 1:256.
What do you understand about prescaler and Postscaler explain in details about both terms?
Prescaler divides the input pulse before the counter and the post scaler divides the output of the counter, both effectively increasing the range of the counter.
Which timer has Postscaler option?
The TImer2 module is an 8-bit timer/counter with the following features: 8-bit timer/counter. Readable and writable. Software programmable prescaler/PostScaler upto 1:16.
Why prescaler is used in counter and timers?
The purpose of the prescaler is to allow the timer to be clocked at the rate a user desires. For shorter (8 and 16-bit) timers, there will often be a tradeoff between resolution (high resolution requires a high clock rate) and range (high clock rates cause the timer to overflow more quickly).
What is timer in microcontroller?
A timer is a specialized type of clock which is used to measure time intervals. A counter is a device that stores (and sometimes displays) the number of times a particular event or process occurred, with respect to a clock signal. It is used to count the events happening outside the microcontroller.
Why is a prescaler used in a timer?
What is the purpose of a prescaler circuit?
A prescaler is an electronic counting circuit used to reduce a high frequency electrical signal to a lower frequency by integer division.
How do I generate PWM with PIC16F877A?
Steps to Configure PWM
- Configure the CCP1 module for PWM operation.
- Set the PWM period by writing to the PR2 register.
- Set the PWM duty cycle by writing to the CCPR1L register and CCP1CON<5:4> bits.
- Make the CCP1 pin an output by clearing the TRISC<2> bit.
What is the meaning for overflow condition in TMR0?
With the interrupt enabled, when the TMR0 register overflows, the CPU will direct execution to the interrupt vector which needs to hold the address of the software interrupt routine. When the overflow occurs, the Interrupt Service Routine (ISR) can preload the TMR0 register and then clear the TMR0IF bit.
What is a clock prescaler?
A prescaler is an electronic counting circuit used to reduce a high frequency electrical signal to a lower frequency by integer division. The purpose of the prescaler is to allow the timer to be clocked at the rate a user desires.
What does postscaler do?
Postscaler, It scales the timer output from 1:1 to 1:16, so interrupt occurs after every 1…16 timer loops. Thanks! according the PIC18f4550 clock diagram it means postscaler and prescaler are the same?
What is the difference between a prescalar and a postcalar?
A prescalar is a pre divider. A postscalar is the opposite of prescalar. The postscaler doesn’t slow the counter, just how often it generates interrupts. if it is set to 2:1 the counter must reach zero twice for the timer interrupt flag bit to be set. A postscalar is a post divider.
What is the difference between postscaler and timer 2?
The postscaler is used in a different fashion and gives the timer added flexibility. The other two timers overflow when they reach 0xFF (Timer 0) and 0xFFFF (Timer 1). Timer 2, on the other
What is a prescaler circuit?
Prescaler. A prescaler is an electronic counting circuit used to reduce a high frequency electrical signal to a lower frequency by integer division. The prescaler takes the basic timer clock frequency (which may be the CPU clock frequency or may be some higher or lower frequency) and divides it by some value before feeding it to the timer,…
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