Indirect Register (Ir) Addressing Mode (Concluded) - Samsung S3F84B8 User Manual

S3F84B8_UM_REV 1.00

3.6 INDIRECT REGISTER (IR) ADDRESSING MODE (CONCLUDED)

4-bit Working
Register Address
Example Instruction
References either
Program Memory or
Data Memory
Figure 3-6
Program Memory
dst src
OPCODE
Sample Instructions:
LCD R5,@RR6
LDE R3,@RR14
LDE @RR4, R8
Indirect Working Register Addressing to Program or Data Memory
MSB Points to
RP0 or RP1
Next 2-bit Point
to Working
Register Pair
(1 of 4)
LSB Selects
Value used in
Instruction
; Program memory access
; External data memory access
; External data memory access
3-6
3 ADDRESSING MODES
Register File
RP0 or RP1
Register
Pair
Program Memory
or
Data Memory
OPERAND
Selected
RP points
to start of
working
register
block
16-Bit
address
points to
program
memory
or data
memory