What are timers and counters?
What are timers and counters?
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.
What are the functions of timer in PIC?
The timer is nothing but a simple binary counter that can be configured to count clock pulses(Internal/External). Once it reaches the max value, it will roll back to zero setting up an Overflow flag and generates the interrupt if enabled.
How many timers are available in pic?
The PIC16F877A PIC MCU has three Timer Modules. They are names as Timer0, Timer1 and Timer2. The Timer 0 and Timer 2 are 8-bit Timers and Timer 1 is a 16-bit Timer.
Which of the following is a 16-bit timer in PIC?
PIC Timer Module
| Timer | Size | Control Register |
|---|---|---|
| TIMER0 | 8-bit | OPTION_REG |
| TIMER1 | 16-bit | T1CON |
| TIMER2 | 8-bit | T2CON |
Is the timer on a PIC a counter or a timer?
Timer0 can operate as a timer or as a counter. When the clock source is the instruction cycle clock, it operates as a timer and when the clock source is the T0CKI pin, it operates as a counter. When PIC18f452 reads the TMR0L register, the upper half of Timer0 is latched into the TMR0H register.
How does a timer work in a PIC microcontroller?
The Timer0 module in a PIC16F688 microcontroller is an 8-bit synchronous counter that stores the value for the counter in the special function register called TMR0. This register can be read or written at any time by software. If you write a value to it, the counter will start incrementing from there.
What is the value of the timer and counter?
The Functioning of the timer0 can be understood from this block diagram. The Timer 0 stores the value TMR0 registers, TMR0H is the high byte and TMR0L is the lower byte. The higher byte will be useful when using 16-bit mode. Timer0 is worked as timer and counter.
How are timers used in a visitor counter?
Timers are mainly used for counting or measuring external events. For example in the case of a visitor counter, the sensor placed for detecting the presence of a person goes high when someone crosses the door. The output of the sensor is connected to the Timer Clock Input Pin of the microcontroller.