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

S3C9228/P9228 SAM88RCRI INSTRUCTION SET

6 SAM88RCRI INSTRUCTION SET

OVERVIEW

The SAM88RCRI instruction set is designed to support the large register file. It includes a full complement of 8- bit arithmetic and logic operations. There are 41 instructions. No special I/O instructions are necessary because I/O control and data registers are mapped directly into the register file. Flexible instructions for bit addressing, rotate, and shift operations complete the powerful data manipulation capabilities of the SAM88RCRI instruction set.

REGISTER ADDRESSING

To access an individual register, an 8-bit address in the range 0-255 or the 4-bit address of a working register is specified. Paired registers can be used to construct 16-bit program memory or data memory addresses. For detailed information about register addressing, please refer to Section 2, "Address Spaces".

ADDRESSING MODES

There are six addressing modes: Register (R), Indirect Register (IR), Indexed (X), Direct (DA), Relative (RA), and Immediate (IM). For detailed descriptions of these addressing modes, please refer to Section 3, "Addressing Modes".

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