S3C9454B View Datasheet(PDF) - Samsung
Part Name
Description
MFG CO.
'S3C9454B' PDF : 199 Pages View PDF
ADDRESSING MODES
S3C9454B/F9454B
RELATIVE ADDRESS MODE (RA)
In Relative Address (RA) mode, a two's-complement signed displacement between – 128 and + 127 is specified
in the instruction. The displacement value is then added to the current PC value. The result is the address of the
next instruction to be executed. Before this addition occurs, the PC contains the address of the instruction
immediately following the current instruction.
The instructions that support RA addressing is JR.
Program Memory
Next OPCODE
Program Memory
Address Used
Current Instruction
Displacement
OPCODE
Current
PC Value
+
Signed
Displacement Value
Sample Instructions:
JR
ULT,$ + OFFSET
; Where OFFSET is a value in the range + 127 to - 128
Figure 3-12. Relative Addressing
IMMEDIATE MODE (IM)
In Immediate (IM) addressing mode, the operand value used in the instruction is the value supplied in the operand
field itself. Immediate addressing mode is useful for loading constant values into registers.
Program Memory
OPERAND
OPCODE
(The Operand value is in the instruction)
Sample Instruction: LD R0,#0AAH
Figure 3-13. Immediate Addressing
3-12
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