Question

Find the machine cycle for AT89C51 if XTAL = 11.0592MHz.

(a) 90.42us

(b) 361.68us

(c) 1.085us

(d) 150.145us

I have been asked this question in my homework.

I would like to ask this question from Microcontroller (8051- Pin, Registers, Timers) in portion Prototyping Embedded Devices of IOT

Answer 1

The correct option is (b) 361.68us

Easiest explanation: Machine cycle = No.of cycles/frequency

          Time = 1/frequency

          Time(ns) = 1/11.0592MHz

                 = 90.42ns

          Machine cycles = 12*90.42

                       = 1.085us.