Samsung S3C9444 User Manual page 39

ADDRESSING MODES
INDIRECT REGISTER ADDRESSING MODE (Concluded)
4-Bit Working
Register Address
Example instruction
references either
program memory or
data memory
Sample Instructions:
LCD
LDE
LDE
Figure 3-6. Indirect Working Register Addressing to Program or Data Memory
3-6
Program Memory
dst src
Next 3 Bits Point
OPCODE
R5,@RR6 ; Program memory access
R3,@RR14 ; External data memory access
@RR4, R8 ; External data memory access
Register File
Register
to working
register pair
(1 of 8)
Program Memory
LSB Selects
Data Memory
Value used in
OPERAND
instruction
S3C9444/F9444_UM_REV1.10
CFH
.
.
.
.
Pair
C0H
16-Bit
address
points to
or
program
memory
or data
memory