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Does an 8051 microcontroller need external oscillator to run?(a) True(b) FalseI have been asked this question in examination.My doubt stems from Microcontroller (8051- Pin, Registers, Timers) in chapter Prototyping Embedded Devices of IOT

Answer»

The CORRECT OPTION is (a) True

Easiest explanation: The 8051 has an on CHIP oscillator but requires an EXTERNAL oscillator clock to run it. Most often a quartz crystal oscillator is connected to inputs XTAL1 and XTAL2.



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