Timers And Counters

Timer online with alarm.

Timers and counters. A timer uses counter which counts at certain speed depending upon the clock frequency. They can be used as timers or as event counters. In modern applications counters are based on electronic devices and the counters are sequential logic circuit designed to record the number of electric pulses fed into the counter. Meaning arduino moves from one instruction to another instruction for every 62 nano second.

Create one or multiple timers and start them in any order. Counters and timers provide timing and digital i o. Since the 8051 follows an 8 bit architecture each 16 bit is accessed as two separate registers of low byte and high byte. Timer mode control tmod.

A timer is an application of the counters where a certain signal with a fixed frequency hence period is counted to record the time. Lower 4 bits are used for control operation of timer. Tmod timer mode register and tcon timer control register which are used for activating and configuring timers and counters. In arduino uno it takes 1 16000000 seconds or 62nano seconds to make a single count.

Tmod is an 8 bit register used for selecting timer or counter and mode of timers. Use these products for monitoring quadrature encoders event counting period measurement pulse generation pulse train generation two edge separation measurement and more. Counters and timers in 8051 microcontroller contain two special function registers. The 8051 has two timers timer 0 and timer 1.