Samsung S3C9454B User Manual page 41

ADDRESSING MODES
INDIRECT REGISTER ADDRESSING MODE (Concluded)
4-Bit Working
Register Address
Example instruction
references either
program memory or
data memory
Figure 3-6. Indirect Working Register Addressing to Program or Data Memory
3-6
Program Memory
dst src
OPCODE
Sample Instructions:
LCD R5,@RR6
LDE R3,@RR14
LDE @RR4, R8
Next 3 Bits Point
to working
register pair
(1 of 8)
LSB Selects
Value used in
instruction
; Program memory access
; External data memory access
; External data memory access
Register File
CFH
.
.
.
.
Register
Pair
C0H
Program Memory
or
Data Memory
OPERAND
S3C9454B/F9454B
16-Bit
address
points to
program
memory
or data
memory