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

Opcode	Instruction	Clocks	Operation
--	LD A,(ps+d)	7 (2,2,1,2)	A = (ps + d)
8D d	LD A,(PW+d)	7 (2,2,1,2)	A = (PW + d)
9D d	LD A,(PX+d)	7 (2,2,1,2)	A = (PX + d)
AD d	LD A,(PY+d)	7 (2,2,1,2)	A = (PY + d)
BD d	LD A,(PZ+d)	7 (2,2,1,2)	A = (PZ + d)

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

Description

Load A with the data whose 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 ps is 0xFFFFxxxx, i.e., the upper 16 bits are all ones, it represents a logical address with only the low 16 bits being significant. This is called a "long logical" address. Otherwise, it is a physical address with the low 20 or 24 bits (depending on the memory that is used) being significant.

The address is computed as the sum of ps and the 8-bit signed value d.