Samsung S3F80JB manual Indexed Addressing to Program or Data Memory

S3F80JB ADDRESSING MODES

INDEXED ADDRESSING MODE (Continued)

	Program Memory
	OFFSET
4-bit Working	OFFSET
	dst/src	x
Register Address
	OPCODE

Sample Instructions:

		Register File
MSB Points to
	RP0 or RP1	RP0 or RP1
				Selected
				RP points
	~		~	to start of
				working
				register
NEXT 2 BITS				block
		Register
Point to Working
		Pair
Register Pair				16-Bit
				address
		Program Memory		added to
				offset
LSB Selects		or
	+	Data Memory
16-Bit	16-Bit
	16-Bit	OPERAND		Value used in
				Instruction

LDC	R4, #1000H[RR2]	;	The values in the program address (RR2 + 1000H)
			are loaded into register R4.
LDE	R4,#1000H[RR2]	;	Identical operation to LDC example, except that
			external data memory is accessed.

NOTE: LDE command is not available, because an external interface is not implemented for the S3F80JB.

Figure 3-9. Indexed Addressing to Program or Data Memory

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