If you start with a hexadecimal literal, then you can convert it to text representing its binary value
using dec2bin.
D = 0x8F;
binStr = dec2bin(D)
binStr =
'10001111'
Bitwise Operations with Binary Values
One typical use of binary numbers is to represent bits. For example, many devices have registers that
provide access to a collection of bits representing data in memory or the status of the device. When
working with such hardware you can use numbers in MATLAB to represent the value in a register.
Use binary values and bitwise operations to represent and access particular bits.
Create a number that represents an 8-bit register. It is convenient to start with binary representation,
but the number is stored as an integer.
register = 0b10010110
register = uint8
150
To get or set the values of particular bits, use bitwise operations. For example, use the bitand and
bitshift functions to get the value of the fifth bit. (Shift that bit to the first position so that
MATLAB returns a 0 or 1. In this example, the fifth bit is a 1.)
b5 = bitand(register,0b10000);
b5 = bitshift(b5,-4)
b5 = uint8
1
To flip the fifth bit to 0, use the bitset function.
register = bitset(register,5,0)
register = uint8
134
Since register is an integer, use the dec2bin function to display all the bits in binary format.
binStr is a character vector, and represents the binary value without a leading 0b prefix.
binStr = dec2bin(register)
binStr =
'10000110'
See Also
bin2dec | bitand | bitshift | bitset | dec2bin | dec2hex | hex2dec | sprintf | sscanf
More About
•
“Convert Text to Numeric Values” on page 6-49
•
“Convert Numeric Values to Text” on page 6-45
Hexadecimal and Binary Values
6-57