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Why power on reset is a must for microcontrollers?

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power on reset!

POR will ensure that PC register is loaded with 0 value and other register also loaded with there starting value. There for POR is MUST for MCU.
 

Re: power on reset!

Most microcontrollers have specs that describe power up ramps for proper initialization of the controller. A glitch on the supply line may very well cause the microcontroller (or some other component) to power-up incorrectly and prevent the system from operating as intended .. A supervisor device solves this problem by holding the microcontroller in reset until the power has reached a stable level.
Click to expand...
Quoted from:
"Understanding and Using Supervisory Circuits"
**broken link removed**

Regards,
IanP
 

power on reset!

Read data sheet of PIC16F84A. It has given there why POR is required.
 

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