This Left shifts the 8 bits of the first byte 8 positions to the left. This is a Bitwise AND. Used this way the right side of the expression will act as a mask to zero out one byte so we can work with just the other one. If the range of expected values is bigger than we can use the same trick.
The only difference is that we have to manually shift bits when we encode on Arduino, just like we did in the payload function. To tell the difference between and you will need a signed data type.
This does mean that for example in a word only 15 of the 16 bits are available for the actual number, limiting the range from to The data types we used so far are all signed, which means all of the tricks work just as well for negative values.
Just be aware of the maximum value. So far we have only dealt with rounded numbers. What if you need more precision? The answer very similar to how we indexed or rounded big numbers. Search web zytrax. All rights reserved. Legal and Privacy site by zytrax web-master at zytrax Page modified: August 15 A byte 8 bits has possible values in the range 0 - Each Hexadecimal character represents 4 bits 0 - 15 decimal which is called a nibble a small byte - honest!
Legal and Privacy. What's New. ISP Services. Contact Us. On-Line Help. How many bits are in a single byte? The byte is a unit of digital information that most commonly consists of eight bits. Historically, the byte was the number of bits used to encode a single character of text in a computer and for this reason it is the smallest addressable unit of memory in many computer architectures.
Dragana Golosovker Supporter. What is the highest number you can count to with 4 bits? Edurne Vox Supporter. How many bytes is a text? Bytes are frequently used to hold individual characters in a text document.
Most computers extend the ASCII character set to use the full range of characters available in a byte. Sebastiano Arroniz Beginner. What is an 8 bit integer? An 8 - bit unsigned integer has a range of 0 to , while an 8 - bit signed integer has a range of to - both representing distinct numbers.
It is important to note that a computer memory location merely stores a binary pattern. Cesc Guiducci Beginner. How many bytes is? The calculations is based on:. Itamar Straetman Beginner. Why is the max? Binary math!! Now what's so special about the number is, when you convert that decimal number to binary bits, you get a value of , which is the maximum value a single byte can store. So, one byte can represent one of values.
In hex 1KByte is bytes and the address range is 0 to 3FF. This is quite interesting but you begin to see the pay off when you look at the problem of addressing say 64KBytes which in decimal is but in hex is simply bytes. The equivalent addressing ranges are 0 to in decimal and 0 to FFFF in hex.
The following table shows how much simpler these commonly used values and ranges look in hex:. If you look at this table you will notice that 1KByte stands out like a sore thumb as not being a nice hex number.
The reason is that 1KByte is a strange unit of memory that has received attention just because it is close to decimal, i. It is more natural for the size of memory to double at each step because adding an additional hardware addressing line allows you to work with twice as much memory.
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