work in progress...
Do nothing
Load unconditionally / load if Zero flag is set (1) / load if Zero flag is reset (0)
NOTE: all LD instructions can be also used as LDZ and LDNZ variants.
This also applies to aliases of load instruction, i.e. jump, output and input.
Load AL (low byte of A/R3 register) with a immediate byte
Load AH (high byte of A/R3 register) with a immediate byte
Load value from Rx to Ry, i.e. Rx --> Ry
NOTE: LD R0, Rx is a jump instruction
Jump to address stored in Rx
Load value from memory at address stored in Rx to Ry, i.e. (Rx) --> Ry
Load value from Rx to memory at address stored in Ry, i.e. Rx --> (Ry)
Output a value from Rx to output port y
Input a value from input port x to Rx
Add value of Ry to Rx, i.e. Rx += Ry, set flags accordingly
Subtract value of Rx from Ry, i.e. Rx -= Ry, set flags accordingly
Compare value of Rx to Ry, only set flags
Binary AND Rx with Ry, i.e. Rx &= Ry, set flags accordingly
Binary OR Rx with Ry, i.e. Rx |= Ry, set flags accordingly
Binary XOR Rx with Ry, i.e. Rx ^= Ry, set flags accordingly
Increase value of Rx, set flags accordingly
Decrease value of Rx, set flags accordingly
Execute LDAL and LDAH on low and high bytes of given word
Execute LDA to load a word into A / R3 and then load it to Rx
NOTE: this macro overwrites A / R3
Execute LDA to load an address into A / R3 and then jump to the given address
NOTE: this macro overwrites A / R3
Execute LDA to load an address into A / R3,
push return address to stack and jump to the given address.
NOTE: this macro overwrites A / R3
Pop return address from stack to A / R3 and then jump to the return address.
NOTE: this macro overwrites A / R3
Decrease stack pointer R1 and load value of Rx to the memory at new stack pointer.
Load value from memory at current stack pointer R1 to Rx, increase stack pointer.