ADDRESSING MODES AND INSTRUCTION SET

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Presentation transcript:

ADDRESSING MODES AND INSTRUCTION SET UNIT-2 ADDRESSING MODES AND INSTRUCTION SET

Notations used in Instructions Rn - Working register R0-R7. direct - 128 internal RAM locations, any l/O port, control or status register. @Ri - Indirect internal or external RAM location addressed by register R0 or R1. #data - 8-bit constant included in instruction. #data 16 - 16-bit constant included in instruction. bit - Any bit addressable l/O pin, control or status bit. 3-Dec-18 Micro 8051

3-Dec-18 Micro 8051

Addressing modes The CPU can access data in various ways, which are called addressing modes: Immediate Register Direct Register indirect Indexed Accessing memories 3-Dec-18 Micro 8051

Immediate Addressing Mode

Register Addressing Mode

Direct Addressing Mode

Register Indirect Addressing Mode

Continues…

Indexed Addressing mode