Samsung S3P80C5 User Manual page 55

ADDRESSING MODES
INDIRECT REGISTER ADDRESSING MODE (Continued)
4-bit Working
Register Address
Example Instruction
References either
Program Memory or
Data Memory
NOTE:
Figure 3-6. Indirect Working Register Addressing to Program or Data Memory
3-6
Program Memory
dst src
OPCODE
Sample Instructions:
LDC R5,@RR6
LDE R3,@RR14
LDE @RR4, R8
LDE command is not available, because an external interface is not implemented for
the S3C80C5/C80C8/C80C4.
MSB Points to
RP0 or RP1
Next 2-bit Point
to Working
Register Pair
(1 of 4)
Program Memory
LSB Selects
Data Memory
Value used in
Instruction
; Program memory access
; External data memory access
; External data memory access
S3P80C5/C80C5/C80C8
Register File
RP0 or RP1
Selected
RP Points
to Start of
Working
Register
Block
Register
Pair
or
OPERAND
16-Bit
Address
Points to
Program
Memory or
Data
Memory