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What is the use of watchdog timer in PIC?
Simply put, the watchdog timer is a hardware timer in the PIC that, if not constantly reset by the software, will cause the PIC to reset. This feature can be incredibly useful if the PIC should hang due to a hardware or software issue and guarantees that the PIC will restart from the beginning.
How many Timers are there in pic 16f877a?
PIC16F877a has three timers. All Timers can act as a timer or counter or PWM Generation. now we will see each one by one. To start using a timer we should understand some of the fancy terms like 8-bit/16-bit timer, Prescaler, Timer interrupts, and Focs.
Should I disable Watchdog Timer?
In many microprocessor applications where a watchdog supervisor, such as the TPS3306, is required, it may be necessary to disable the watchdog. This is particularly true when software boot times exceed the watchdog time-out period.
How is the timer used in the watchdog?
When using the timer, there are two main ways which this can be done: Since we have not considered interrupts yet, we will focus on using the timer to make a simple 1ms delay via polling. The first task when using the timer is to configure, which is done by configuring registers associated with the timer.
What does the timer0 do on a PIC?
Most PICs have a timer0, which is usually an 8-bit timer that can be clocked from multiple sources, is used for other peripherals, and can generate interrupts upon overflowing. This makes it very useful for crucial timing routines, but can be used as a generic timer as well.
What is the purpose of a watchdog circuit?
This is the purpose of a watchdog circuit. A watchdog circuit is nothing new. Many microprocessors and microcontrollers have them. But how does it work? Well, inside the PIC there is a resistor/capacitor network. This provides a unique clock, which is independent of any external clock that you provide in your circuit.
How to replace delay function with Timer Register delay?
You will learn how to replace the delay function with the Timer register delay. Most likely you did hear about Watchdog timer, but did you try to implement in your PIC Microcontroller project?