Timers And Counters In Microcontroller

Higher the clock frequency higher will be the processing speed.

Timers and counters in microcontroller.

That s far from the 1 000 000 ticks per second that the standard avr microcontroller provides. However the counter only counts up to to either 256 8 bit counter or 65535 16 bit counter. They can be used either as timers or as counters. Both timer 0 and timer 1 are 16 bit wide.

Lower 4 bits are used for control operation of timer. Timer 0 and timer 1. They can be used as timers or as event counters. The figure below shows the prescaler and input selector configuration for a timer counter control registered as used in most avr microcontrollers.

The 8051 has two counters timers which can be used either as timer to generate a time delay or as counter to count events happening outside the microcontroller. The timer and counter functions in the microcontroller simply count in sync with the microcontroller clock. Every microcontroller has a clock oscillator say in arduino uno it is 16mhz. The timer and counter functions in the microcontroller count in sync with the microcontroller clock.

The timer counter control register tccrx associated with the timer contains the counter select bits csx2 csx1 csx0 that control which input is used with a specific counter. The 8052 has these two plus one more. The 16 bit register of timer 0 is accessed as low and high byte. So timer counter is a software designed to count the time interval between events.

Thus one can think of it as. Both timers are 16 bits wide. All three can be configured to operate either as timers or event counters. Counters and timers in 8051 microcontroller contain two special function registers.

The timers and counters in 8051 microcontroller has two 16 bit timer counter registers. Since the 8051 follows an 8 bit architecture each 16 bit is accessed as two separate registers of low byte and high byte. Tmod is an 8 bit register used for selecting timer or counter and mode of timers. The 8051 has two timers timer 0 and timer 1.

It counts the cycle of the peripheral clock or an externally supplied clock. However the counter can only count up to either 256 8 bit counter or 65535 16 bit counter. That is a far cry from the 1 000 000 ticks per second that the standard avr microcontroller provides. Timers t0 and t1 completely fall under the 8051 standard.

This is responsible for speed. In arduino uno it takes 1 16000000 seconds or 62nano seconds to make a single count. Tmod timer mode register and tcon timer control register which are used for activating and configuring timers and counters. A timer uses counter which counts at certain speed depending upon the clock frequency.

The 8051 has two timers.