Samsung 8-Bit CMOS Microcontroller, S3C9228/P9228 user manual Addressing Modes

S3C9228/P9228 ADDRESSING MODES

3 ADDRESSING MODES

OVERVIEW

Instructions that are stored in program memory are fetched for execution using the program counter. Instructions indicate the operation to be performed and the data to be operated on. Addressing mode is the method used to determine the location of the data operand. The operands specified in SAM88RCRI instructions may be condition codes, immediate data, or a location in the register file, program memory, or data memory.

The SAM88RCRI instruction set supports six explicit addressing modes. Not all of these addressing modes are available for each instruction. The addressing modes and their symbols are as follows:

—Register (R)

—Indirect Register (IR)

—Indexed (X)

—Direct Address (DA)

—Relative Address (RA)

—Immediate (IM)

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