Samsung S3P80C5 User Manual page 58

S3P80C5/C80C5/C80C8
INDEXED ADDRESSING MODE (Continued)
4 Bit Working
Register Address
Sample Instructions:
LDC
LDE
NOTE:
Program Memory
OFFSET
OFFSET
dst/src x
OPCODE
R4, #1000H[RR2]
R4, #1000H[RR2]
LDE command is not available, because an external interface is not implemented for
the S3C80C5/C80C8/C80C4.
Figure 3-9. Indexed Addressing to Program or Data Memory
MSB Points to
RP0 or RP1
~
Next 2 Bits
Point to Working
Register Pair
LSB Selects
+
16-Bits
8-Bits
16-Bits
; The values in the program address (RR2 + 1000H)
are loaded into register R4.
; Identical operation to LDC example, except that
external program memory is accessed.
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
Added to
Offset
Value used in
Instruction
3-9