Pic instruction set architecture pdf

Figuring Out The Instruction Syntax The PIC instruction set is nice, in that once you figure out one instruction you ve figured out most of them, but it is a little different than what we re used to. The secret codes and how instructions are formed is described in the following tables: TABLE 13-1: OPCODE FIELD DESCRIPTIONS Field Descriptio n f An instruction set architecture (ISA) is an abstract model of a computer.It is also referred to as architecture or computer architecture.A realization of an ISA is called an implementation.An ISA permits multiple implementations that may vary in performance, physical size, and monetary cost (among other things); because the ISA serves as the interface between software and hardware. Martin Bates, in PIC Microcontrollers (Third Edition), 2011. 5.2.2 Instruction Execution. The program execution section of the MCU contains the instruction register, instruction decoder, and timing and control logic.The 14-bit instructions stored in program memory are copied to the instruction register for decoding; each instruction contains both the operation code and operand. Instruction Set ADDC A, < src-byte> Function: Add with carry Description: ADDC simultaneously adds the byte variable indicated, the carry flag and the accumulator cont ents, l eavin g the result in the accumulator. The c arry and auxili ary carry flags are set, respectively, if there is a carry out of bit 7 or bit 3, and cleared otherwise. Overview. The PIC instruction set architecture (ISA) has a couple of 'flavors' with 12, 14, and 16 bit versions. Generally they more bits give the chip more memory addressing but it they include some additional instructions. This chapter covers the commands which the microcontroller "understands". The instruction set for the 16FXX includes 35 instructions in total. Such a small number of instructions is specific to the RISC microcontroller because they are well-optimized from the aspect of operating speed, simplicity in architecture and code compactness. The PIC instruction set refers to the set of instructions that Microchip Technology PIC or dsPIC microcontroller supports. The instructions are usually programmed into the Flash memory of the processor, and automatically executed by the microcontroller on startup.. PICmicro chips have a Harvard architecture, and instruction words are unusual sizes. MIPS processors use a load/store architecture; all operations are performed on operands held in processor registers and main memory is accessed only through load and store instructions. Types of Loads and Stores. There are several different types of load and store instructions, each designed for a different purpose: Classification According to Instruction Set. CISC: CISC is a Complex Instruction Set Computer. It allows the programmer to use one instruction in place of many simpler instructions. RISC: The RISC is stands for Reduced Instruction set Computer, this type of instruction sets reduces the design of microprocessor for industry standards. It allows The PIC architecture consists of two memories: Program memory and the Data memory. Program Memory: This is a 4K*14 memory space. It is used to store 13-bit instructions, or the program code. The program memory data is accessed by the program counter register that holds the address of the program Instruction Sets • "Instruction set architecture is the structure of a computer that a machine language programmer (or a co