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assembly.md

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assembly.md

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Topic Opcdoe Description
Registers 6XNN Store number NN in register VX
8XY0 Store the value of register VY in register VX
7XNN Add the value NN to register VX
8XY4 Add the value of register VY to register VX / Set VF to 01 if a carry occurs / Set VF to 00 if a carry does not occur
8XY5 Subtract the value of register VY from register VX / Set VF to 00 if a borrow occurs / Set VF to 01 if a borrow does not occur
8XY7 Set register VX to the value of VY minus VX / Set VF to 00 if a borrow occurs / Set VF to 01 if a borrow does not occur
8XY2 Set VX to VX AND VY
8XY1 Set VX to VX OR VY
8XY3 Set VX to VX XOR VY
8XY6 Store the value of register VY shifted right one bit in register VX / Set register VF to the least significant bit prior to the shift
8XYE Store the value of register VY shifted left one bit in register VX / Set register VF to the most significant bit prior to the shift
CXNN Set VX to a random number with a mask of NN
Jumps 1NNN Jump to address NNN
BNNN Jump to address NNN + V0
Subroutines 2NNN Execute subroutine starting at address NNN
00EE Return from a subroutine
0NNN Execute machine language subroutine at address NNN
Skips 3XNN Skip the following instruction if the value of register VX equals NN
5XY0 Skip the following instruction if the value of register VX is equal to the value of register VY
4XNN Skip the following instruction if the value of register VX is not equal to NN
9XY0 Skip the following instruction if the value of register VX is not equal to the value of register VY
Timers FX15 Set the delay timer to the value of register VX
FX07 Store the current value of the delay timer in register VX
FX18 Set the sound timer to the value of register VX
Input FX0A Wait for a keypress and store the result in register VX
EX9E Skip the following instruction if the key corresponding to the hex value currently stored in register VX is pressed
EXA1 Skip the following instruction if the key corresponding to the hex value currently stored in register VX is not pressed
I Register ANNN Store memory address NNN in register I
FX1E Add the value stored in register VX to register I
Drawing DXYN Draw a sprite at position VX, VY with N bytes of sprite data starting at the address stored in I / Set VF to 01 if any set pixels are changed to unset, and 00 otherwise
00E0 Clear the screen
Fonts FX29 Set I to the memory address of the sprite data corresponding to the hexadecimal digit stored in register VX
Decimal FX33 Store the binary-coded decimal equivalent of the value stored in register VX at addresses I, I+1, and I+2
Memory FX55 Store the values of registers V0 to VX inclusive in memory starting at address I / I is set to I + X + 1 after operation
FX65 Fill registers V0 to VX inclusive with the values stored in memory starting at address I / I is set to I + X + 1 after operation
Opcdoe Short Description
0NNN Deprecated (Machine Exec) Execute machine language subroutine at address NNN
00E0 Clear Clear the screen
00EE Return Return from a subroutine
1NNN Jump Jump to address NNN
2NNN Exec Execute subroutine starting at address NNN
3XNN SkipX==NN Skip the following instruction if the value of register VX equals NN
4XNN SkipX!=NN Skip the following instruction if the value of register VX is not equal to NN
5XY0 SkipX==Y Skip the following instruction if the value of register VX is equal to the value of register VY
6XNN Store Store number NN in register VX
7XNN Add Add the value NN to register VX
8XY0 vX = vY Store the value of register VY in register VX
8XY1 vX = vY
8XY2 vX &= vY Set VX to VX AND VY
8XY3 vX ^= vY Set VX to VX XOR VY
8XY4 vX += vY Add the value of register VY to register VX / Set VF to 01 if a carry occurs / Set VF to 00 if a carry does not occur
8XY5 vX -= vY Subtract the value of register VY from register VX / Set VF to 00 if a borrow occurs / Set VF to 01 if a borrow does not occur
8XY6 vX =>> vY Store the value of register VY shifted right one bit in register VX / Set register VF to the least significant bit prior to the shift
8XY7 vX = vY - vX Set register VX to the value of VY minus VX / Set VF to 00 if a borrow occurs / Set VF to 01 if a borrow does not occur
8XYE vX =<< vY Store the value of register VY shifted left one bit in register VX / Set register VF to the most significant bit prior to the shift
9XY0 SkipX!=Y Skip the following instruction if the value of register VX is not equal to the value of register VY
ANNN Store Store memory address NNN in register I
BNNN Jump+ Jump to address NNN + V0
CXNN Rand Set VX to a random number with a mask of NN
DXYN Sprite Draw a sprite at position VX, VY with N bytes of sprite data starting at the address stored in I / Set VF to 01 if any set pixels are changed to unset, and 00 otherwise
EX9E SkipKeyvX Skip the following instruction if the key corresponding to the hex value currently stored in register VX is pressed
EXA1 SkipNotKeyvX Skip the following instruction if the key corresponding to the hex value currently stored in register VX is not pressed
FX07 DelayToVX Store the current value of the delay timer in register VX
FX0A Key Wait for a keypress and store the result in register VX
FX15 VXToDelay Set the delay timer to the value of register VX
FX18 Sound Set the sound timer to the value of register VX
FX1E I+=VX Add the value stored in register VX to register I
FX29 Font Set I to the memory address of the sprite data corresponding to the hexadecimal digit stored in register VX
FX33 StoreBinary Store the binary-coded decimal equivalent of the value stored in register VX at addresses I, I+1, and I+2
FX55 StoreRegisters Store the values of registers V0 to VX inclusive in memory starting at address I / I is set to I + X + 1 after operation
FX65 LoadRegisters Fill registers V0 to VX inclusive with the values stored in memory starting at address I / I is set to I + X + 1 after operation