LD Load instructions

How to decode ld instructions from binary

Opcode format
7	6	5	4	3	2	1	0

Set 1
0	0	0	B		0	1	0

Set 4
0	0	B		0	0	0	1

Set 2
0	0	1	B		0	1	0
7	nn						0
15	nn						8

Set 3
0	0	b			1	1	0
n

LD r, r'
0	1	r			r'

LD r, (HL)
0	1	r			1	1	0

LD SP,HL
1	1	1	1	1	0	0	1

Registers
Register	r
B	000
C	001
D	010
E	011
H	100
L	101
A	111

Bits
Value		b	B
0		000	00
1		001	01
2		010	10
3		011	11
4		100
5		101
6		110
7		111

Set 1 store a in memory
4	3	Instruction
0	0	LD (BC),A
0	1	LD (DE),A
1	0	LD A,(BC)
1	1	LD A,(DE)

Set 2 store in memory
5	4	Instruction
0	0	LD (nn),HL
0	1	LD (nn),A
1	0	LD HL,(nn)
1	1	LD A,(nn)

Set 3 set to constant n
4	3	2	Instruction
0	0	0	LD B,n
	0	1	LD C,n
	1	0	LD D,n
	1	1	LD E,n
1	0	0	LD H,n
	0	1	LD L,n
	1	0	LD (HL),n
	1	1	LD A,n

Set 4 set to constant nnn
5	4	Instruction
0	0	LD BC,nn
0	1	LD DE,nn
1	0	LD HL,nn
1	1	LD SP,nn

Last modified November 12, 2021: Finish LD instructions (c8e297c)