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Instruction set of 8051 Microcontrollers
- 1. Instruction Set of8051 Sushil Karvekar Walchand College of Engineering Sangli
- 2. Special Function Registers •8051 has 21 Special Function Registers • Address of SFRs : 80H to FFH • Some SFRs are both bit addressable and byte addressable • Eg: T0CON , T1CON, SMOD, etc
- 3. Instruction Set of8051 • MUL AB : Performs multiplication of contents in A and B registers • Stores the 16 bit result in registers A(lower byte) and B(higher byte) • DIV AB: Divides content of A by B • Result=> Quotient in A and Remainder in B
- 4. Types of InstructionSets • Arithmetic • Logical • Data Transfer • Boolean variable • Program Branching
- 5. Arithmetic Intructions • Executein one machine cycle • Except INC (Two Machine Cycles) • MUL AB and DIV AB (4 machine cycles)
- 6. Notations • Rn: Oneof the working registers R0 to R7 • A : Accumulator • @Ri : Indirect Registers R0 or R1 • Direct :8-bit address of RAM • #data : immediate data • Addr16 : 16-bit Address
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