Digital Electronics - The 8051 Microcontroller - Discussion

Discussion :: The 8051 Microcontroller - General Questions (Q.No.12)


Device pins XTAL1 and XTAL2 for the 8051 are used for connections to an external oscillator or crystal.

[A]. True
[B]. False

Answer: Option A


No answer description available for this question.

Rahul Kumar said: (Aug 14, 2011)  
It is in pin configuration.

Vikram said: (Sep 13, 2011)  
Either oscillator or crystal can be connected to this pins but for accurate clock crystal is used.

Tejas said: (Nov 23, 2011)  
If some1 wants to drive the connected peripheral device with some different clock speed then he may use these pins in order to have expected speed (clk) for his peripheral device...

Rjkarthigeyan said: (Feb 12, 2013)  
If the timer in 8051 is used as counter (C/T = 1) the clock pulse to the timer from the crystal oscillator is cut off.

So we need an external pulse from outside device in order to trigger on the counter, which will be done through the crystal pins.

Sri said: (Jun 17, 2013)  
Microcontroller has internal clock circuit. It must be triggered with help of crystal or oscillator. Thus external crystal is used.

Sabari said: (Nov 30, 2013)  
19 & 20 pin for external osc pin.

Srikanth said: (Apr 27, 2015)  
In 8051 crystal oscillator is connected to two capacitors of 33pf, here we can use capacitors which are having values different, what will happen?

Sharon said: (Feb 3, 2017)  
Why we need crystal oscilator in 8051 mc. What is the purpose?

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