Samsung KS57C2308 manual LD Load, Da,A

SAM47 INSTRUCTION SETKS57C2308/P2308/C2316/P2316

LD — Load

LD	dst,src
Operation:	Operand	Operation Summary	Bytes	Cycles
	A,#im	Load 4-bit immediate data to A	1	1
	A,@Rra	Load indirect data memory contents to A	1	1
	A,DA	Load direct data memory contents to A	2	2
	A,Ra	Load register contents to A	2	2
	Ra,#im	Load 4-bit immediate data to register	2	2
	RR,#imm	Load 8-bit immediate data to register	2	2
	DA,A	Load contents of A to direct data memory	2	2
	Ra,A	Load contents of A to register	2	2
	EA,@HL	Load indirect data memory contents to EA	2	2
	EA,DA	Load direct data memory contents to EA	2	2
	EA,RRb	Load register contents to EA	2	2
	@HL,A	Load contents of A to indirect data memory	1	1
	DA,EA	Load contents of EA to data memory	2	2
	RRb,EA	Load contents of EA to register	2	2
	@HL,EA	Load contents of EA to indirect data memory	2	2

Description: The contents of the source are loaded into the destination. The source's contents are unaffected.

If an instruction such as “LDA,#im” (LD EA,#imm) or “LDHL,#imm” is written more than two times in succession, only the first LD will be executed; the other similar instructions that immediately follow the first LD will be treated like a NOP. This is called the “redundancy effect” (see examples below).

Operand				Binary Code						Operation Notation
A,#im	1	0	1		1	d3	d2	d1	d0	A ← im
A,@Rra	1	0	0		0	1	i2	i1	i0	A ← (RRa)
A,DA	1	0	0		0	1	1	0	0	A ← DA
	a7	a6	a5		a4	a3	a2	a1	a0
A,Ra	1	1	0		1	1	1	0	1	A ← Ra
	0	0	0		0	1	r2	r1	r0
Ra,#im	1	1	0		1	1	0	0	1	Ra ← im
	d3	d2	d1		d0	1	r2	r1	r0

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