what is bit masking?????

[D.V.G. Krishna]

iam using atmega16 microcontroller

some one told me that if we want to

check for a single input pin

we need bit masking.

 

what is bit masking??????????? 

[Shrikant]

hello..

A bit mask is a variable used with logical operators.

Assuming you want to read the 5th pin of Portb (actually any port)

variable=PINB&(1<<PB5) // where pb5 refers to the 5th pin…PINB is used to read the values of a port

This is your mask.. it stores the value at the 5th pin into the variable

[AJISH ALFRED]

Hi,

It is nothing but any logic which you’ve applied to change the value of any one of the required port bits keeping the values of other bits unchanged.

[Deepak Gupta]

Bit masking is used to ignore the status of particular bit.

 

you can check input status by using ‘&’ operater like “PINC&(1<<PC2)” if you want to read status of PC2 similarly for oter pins.

 

use ‘|’ or operator for writing a single bit like PORTC |= (1<<PC4) to write logic high at PC4.

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