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S3C8639 View Datasheet(PDF) - Samsung

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S3C8639/C863A/P863A/C8647/F8647
ADDRESSING MODES
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 next instruction
immediately following the current instruction.
Several program control instructions use the Relative Address mode to perform conditional jumps. The
instructions that support RA addressing are BTJRF, BTJRT, DJNZ, CPIJE, CPIJNE, and JR.
Program Memory
Next OPCODE
Program Memory
Address Used
Current Instruction
Displacement
OPCODE
Current
PC Value
+
Signed
Displacement Value
Sample Instruction:
JR
ULT,$+OFFSET
; Where OFFSET is a value in the range +127 to -128
Figure 3-13. Relative Addressing
3-13
 

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