PIC Microcontroller Tutorial

Prescaler and generating a large time delay Project :One Second Delay using PIC18f4580's Timer0 As we have got seen in the examples so far, the duration of the time delay build using the crystal frequency and the timer's 16-bit register.  Crystal frequency and width of 16-bit register can not be modified using code. Both of these factors are on the  far side the jurisdiction of the PIC 18 coder.  The largest time delay is achieved by making both TMR0H and TMR0L zero.   What if that is not enough?  We can use the prescaler option in theT0CON register to increase the delay by reducing the period. The prescaler option of T0CON allows us to divide the instruction clock by a factor up to 256. As we have seen so far, with no prescaler enabled, the crystal oscillator frequency is divided by 4 (Fosc/4) and then fed into Timer0. If we enable the  prescaler bit in the T0CON register, however, then we can divide the instruction  cl...

PIC18f4580 TIMER PROGRAMMING The PIC18f4580 has four timers. they're named as Timers zero, one, two, and three. they will be used either as timers to come up with a time delay or as counters to count events happening outside the microcontroller. First, we see however Timers zero is employed to come up with time delays. Every timer wants a clock pulse to tick. The clock supply will be internal or external. If we have a tendency to use the inner clock supply, then 1/ fourth of the frequency of the crystal oscillator on the OSC1 and OSC2 pins (Fosc/4) is fed into the timer. Therefore, it's used for time delay generation and for that reason is termed a timer. By selecting the external clock choice, we have a tendency to feed pulses through one among the PIC18's pins: this is often known as a counter. GIF  taken from  https://exploreembedded.com Basic registers of the timer Majority of t timers in 18F are 16 bits wide. Because the PIC 18 has an 8- bit ...