ANDI - MIPS instruction reference

andiBitwise AND immediate 
Sets $t1 to $t2 AND an immediate, with the immediate zero-extended instead of sign-extended.
Used in Arithmetic, logic and bitsMIPS assembly
The bitmap display and keyboard registersMIPS assembly
Exceptions and coprocessor 0MIPS assembly
Masks, shifts, popcount, and leading zeroesMIPS assembly
Move a square with the keyboardMIPS assembly
The snake gameMIPS assembly
Flappy birdMIPS assembly
Sampled soundMIPS assembly
 
Forms  andi , ,   
Pseudo-instructionsThe assembler turns these into one or more real instructions.
  andi , ,   
Set $t1 to ($t2 bitwise-AND 32-bit immediate)
 andi ,   
Operands $t1 Any general-purpose register, $0 to $31, using its numeric or named spelling, such as $8 or $t0 ($zero is $0; $ra is $31). 
$t2 A general-purpose register. It may be the same register as $t1. 
uimm16 An unsigned 16-bit immediate, 0 to 65535. 
imm32 A 32-bit immediate, -2147483648 to 4294967295. Pseudoinstruction expansion may overwrite $at, losing its previous value. 
imm An immediate value: an unsigned 16-bit value (0 to 65535) or a 32-bit value (-2147483648 to 4294967295). The assembler chooses a supported encoding for the value and other operands; a pseudoinstruction may expand into several instructions. 
The 16-bit immediate is zero-extended (upper 16 bits become 0, not sign-extended) before the AND. Commonly used to mask off the lower 16 bits of a register or to test individual bits.
 # Keep only the low nibble. Inspect $t2: 5.
li $t0, 0x35
andi $t2, $t0, 0xF