LD (pd+d),A     Load     Rabbit 4000 Instruction

Opcode	Instruction	Clocks	Operation
--	LD (pd+d),A	8(2,2,1,3)	(pd + d) = A
8E d	LD (PW+d),A	8(2,2,1,3)	(PW + d) = A
9E d	LD (PX+d),A	8(2,2,1,3)	(PX + d) = A
AE d	LD (PY+d),A	8(2,2,1,3)	(PY + d) = A
BE d	LD (PZ+d),A	8(2,2,1,3)	(PZ + d) = A

Flags				ALTD			IOI/IOE
S	Z	L/V	C	F	R	SP	S	D
-	-	-	-

Description

Loads the memory location whose address is computed as the sum of pd and the 8-bit signed displacement d with A.

The address is treated either as a logical address that will be passed through the MMU for translation into a physical address or as a physical address that does not need MMU translation.

If pd is 0xFFFFxxxx, i.e., the upper 16 bits are all ones, it represents a logical address. This is called a "long logical" address. Otherwise, it is a physical address with the low 20 bits or 24 bits being significant (depending on the memory available).