{"id":235,"date":"2024-06-19T15:26:38","date_gmt":"2024-06-19T15:26:38","guid":{"rendered":"https:\/\/iotthinghub.com\/?p=235"},"modified":"2024-06-19T17:31:38","modified_gmt":"2024-06-19T17:31:38","slug":"register-bitwise-operator","status":"publish","type":"post","link":"https:\/\/iotthinghub.com\/?p=235","title":{"rendered":"Register & Bitwise Operator"},"content":{"rendered":"\t\t
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Numbering System<\/strong><\/h5>

\"\"<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t

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Bit Pattern<\/strong><\/h5>

\"\"<\/p>

Bitwise Operators<\/strong><\/h5>

\"\"<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t

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AND Operation<\/strong><\/h5>

\"\"<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t

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Example:-<\/p>

uint8_t sample=0x04; \/\/ Binary 0b0000 0100<\/span><\/p>

sample &=8; \/\/ The value will be zero<\/span><\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t

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\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\"\"\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
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OR Operation<\/strong><\/h5>

\"\"<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t

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Example:-<\/p>

uint8_t sample=0x04; \/\/ Binary 0b0000 0100<\/span><\/p>

sample |=8; \/\/ The value will be 12<\/span><\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t

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Ex-OR Operation<\/strong><\/h5>

\"\"<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t

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Example:-<\/p>

uint8_t sample=0x04; \/\/ Binary 0b0000 0100<\/span><\/p>

sample ^=12; \/\/ The value will be 8<\/span><\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t

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NOT Operator<\/strong><\/h5>

It reverses all the bits\u00a0<\/p>

\"\"\u00a0\u00a0\u00a0\u00a0 <\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t

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Example:-<\/p>

uint8_t sample=~4; \/\/ The value should be 251\u00a0\u00a0\u00a0<\/span>\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<\/p>

i.e. 0000 0100 ~ = 1111 1011 = 251<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t

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Rules :- The bit patterns should be represent as<\/p>

\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 1 byte= 8 bit = 2 nibble<\/p>

\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 1 nibble = 4 bit<\/p>

So each byte can be represented as upper nibble and lower nibble.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t

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\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\"\"\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t
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\u00a0 \u00a0 \u00a0 >> and << operators :-<\/strong><\/h5>
\u00a0In general from\u00a0 \u00a0 \u00a0\u00a0Value >> num<\/h6>

Here, num specifies the number of position to right shift the Value in value.\u00a0Example :-<\/p>

uint8_t a=32; \/\/ Binary representation 0b0010 0000\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0\u00a0<\/p>

a=a>>2;<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t

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\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\"\"\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
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In general from \u00a0Value << num<\/h5>

Here, num specifies the number of position to left shift the Value in value. Example :-<\/p>

uint8_t a=1; \/\/ Binary representation 0b0000 0001<\/p>

a<<=3;<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t

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\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\"\"\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t
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Now execute the following instruction and find what happen<\/p>

\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 uint8_t sample=4;<\/p>

\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 sample | =(1<<3);<\/p>

\"\"<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t

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Thus the particular bit is set and it put on effect on other bits. So that the formula to set a particular bit without effecting other bits is-<\/p>

\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 variable_name |=(1<<Bit_position);<\/strong><\/h6>

Similarly to set multiple bit at the same time<\/p>

\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 variable_name |=(1<<Bit_position1)| (1<<Bit_position2)| (1<<Bit_positionN);<\/strong><\/h6>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t
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To clear a particular bit<\/p>

\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 variable_name &=~(1<<Bit_position);<\/strong><\/h6>

Exapmle:-<\/p>

\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 uint8_t sample=0b00011111;<\/p>

\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 sample &=~(1<<3);<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t

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\"\"Similarly to clear multiple bit at a time<\/p>

\u00a0 variable_name &=~((1<<Bit_position1)| (1<<Bit_position2)| (1<<Bit_positionN));<\/strong><\/h6>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
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To toggle a particular bit ^ is used<\/p>

In general from\u00a0 variable_name ^=(1<<Bit_position);<\/strong><\/p>

Exapmle:-<\/p>

\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 uint8_t sample=4;<\/p>

\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 sample ^=(1<<3);<\/p>

\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 sample ^=(1<<3);<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t

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variable_name ^=(1<<Bit_position);<\/figcaption>\n\t\t\t\t\t\t\t\t\t\t<\/figure>\n\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t
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Register Assign<\/strong>:<\/h5>

In all our discussion we learn how to set and clear a particular bit in byte. Let look at the following example \u2013<\/p>

\"\"<\/p>

PORTB|=(1<<PORTB7)|(1<<PORTB6); \/\/ Set PORTB7 & PORTB6<\/span><\/h6>
PORTB&=~((1<<PORTB5)|(1<<PORTB4)); \/\/ Clear PORTB7 & PORTB6<\/span><\/h6>

Here the Register is PORTB and in this register we can set and clear any bit at any time.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t","protected":false},"excerpt":{"rendered":"

Numbering System Bit Pattern Bitwise Operators AND Operation Example:- uint8_t sample=0x04; \/\/ Binary 0b0000 0100 sample &=8; \/\/ The value will be zero OR Operation Example:- uint8_t sample=0x04; \/\/ Binary 0b0000 0100 sample |=8; \/\/ The value will be 12 Ex-OR Operation Example:- uint8_t sample=0x04; \/\/ Binary 0b0000 0100 sample ^=12; \/\/ The value will […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[6],"tags":[],"class_list":["post-235","post","type-post","status-publish","format-standard","hentry","category-basic-interface"],"_links":{"self":[{"href":"https:\/\/iotthinghub.com\/index.php?rest_route=\/wp\/v2\/posts\/235","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/iotthinghub.com\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/iotthinghub.com\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/iotthinghub.com\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/iotthinghub.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=235"}],"version-history":[{"count":67,"href":"https:\/\/iotthinghub.com\/index.php?rest_route=\/wp\/v2\/posts\/235\/revisions"}],"predecessor-version":[{"id":329,"href":"https:\/\/iotthinghub.com\/index.php?rest_route=\/wp\/v2\/posts\/235\/revisions\/329"}],"wp:attachment":[{"href":"https:\/\/iotthinghub.com\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=235"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/iotthinghub.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=235"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/iotthinghub.com\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=235"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}