ADDRESSING MODES S3C8245/P8245/C8249/P8249
3-8

INDEXED ADDRESSING MODE (Continued)

Register File
OPERAND
Program Memory
or
Data Memory
Point to Working
Register Pair
(1 of 4)
LSB Selects
16-Bit
address
added to
offset
RP0 or RP1
MSB Points to
RP0 or RP1
Selected
RP points
to start of
working
register
block
dst/src
OPCODE
Program Memory
x
OFFSET
4-bit Working
Register Address
Sample Instructions:
LDC R4, #04H[RR2] ; The values in the program address (RR2 + 04H)
are loaded into register R4.
LDE R4,#04H[RR2] ; Identical operation to LDC example, except that
external program memory is accessed.
NEXT 2 Bits Register
Pair
Value used in
Instruction
8-Bits 16-Bits
16-Bits
+

~ ~

Figure 3-8. Indexed Addressing to Program or Data Memory with Short Offset