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The instruction set of microcontroller 8051 can be divided into the following groups: Data transfer instructions. Arithmetic instructions. Logical Instructions (Boolean). Program Control Instructions (jumps). Bit manipulation instructions.
For example: INC R1 - Means: Increment register R1 (increment register R1); LJMP LAB5 - Means: Long Jump LAB5 (long jump to the address marked as LAB5); JNZ LOOP - Means: Jump if Not Zero LOOP (if the number in the accumulator is not 0, jump to the address marked as LOOP);
Atmel 8051 Microcontrollers Hardware. 1. 0509C–8051–07/06. Section 1. 8051 Microcontroller Instruction Set. For interrupt response time information, refer to the hardware description chapter. Note: 1. Operations on SFR byte address 208 or bit addresses 209-215 (that is, the PSW or bits in the PSW) also affect flag settings
Alphabetical List of Instructions. ACALL - Absolute Call; ADD, ADDC - Add Accumulator (With Carry); AJMP - Absolute Jump; ANL - Bitwise AND; CJNE - Compare and Jump if Not Equal; CLR - Clear Register; CPL - Complement Register; DA - Decimal Adjust; DEC - Decrement Register; DIV - Divide Accumulator by B
Long addressing. ? Indexed addressing. ? Instruction types. ? Arithmetic operations. ? Logical operations. ? Data transfer instructions. ? Boolean variable instructions. ? Program branching instructions. In this lecture we will look at the various addressing modes and the instructions. The 8051. Architecture course would be
12 Apr 2012 JB ACC.2, <label>• JBC – Jump to a relative address if a bit is set and clear the bit.Microprocessors 1 Msc. Ivan A. Escobar 20 Broitman; 21. Branching Instructions• The 8051 provides four different types of unconditional jump instructions: – Short Jump – SJMP • Uses an 8-bit signed offset relative to the 1st
Bits can be set, cleared, ANDed, ORed etc, with a single instruction. • 8051 ports are bit-addressable, simplifying the interface to single bit inputs and outputs. • The 8051 . Instruction Types. • 8051 instructions are divided among five groups: – Arithmetic. – Logical. – Data transfer. – Boolean variable. – Program branching
In this lecture, Instruction set of 8051 microcontroller will be discussed in detail. Arithmetic and logical instructions, and control transfer instructions will be discussed with examples. 1.Instruction set. The process of writing program for the microcontroller mainly consists of giving instructions. (commands) in the specific order in
The arithmetic instructions also include increment by one, decrement by one and a special instruction called Decimal Adjust Accumulator. The Mnemonics associated with the Arithmetic Instructions of the 8051 Microcontroller Instruction Set are: ADD. ADDC.
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