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

2. Notations used in Instructions
Rn - Working register R0-R7.
direct 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 bit constant included in instruction.
bit - Any bit addressable l/O pin, control or status bit.
3-Dec-18
Micro 8051

3. 3-Dec-18
Micro 8051

4. 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

5. Immediate Addressing Mode

6. Register Addressing Mode

7. Direct Addressing Mode

8. Register Indirect Addressing Mode

9. Continues…

10. Indexed Addressing mode