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How to Program and Interface the 6800 (Blacksburg Continuing by Andrew C. Staugaard Jr.

By Andrew C. Staugaard Jr.

Software and Interface How To's

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Extra resources for How to Program and Interface the 6800 (Blacksburg Continuing Education)

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This addressing mode is normally available to the programmers of PIC18F. The effective address for an instruction using the indexed addressing mode is determined by adding the address portion of the instruction to the contents of the index register. Note that the accumulator is used as the index register in the PIC18F. Status Register A status register, also known as a processor status word register or condition code register, contains individual bits, with each bit having special significance.

10 Microcontroller Theory and Applications with the PIC18F The Intel Corporation is generally acknowledged as the company that introduced the first microprocessor successfully into the marketplace. Its first microprocessor, the 4004, was introduced in 1971 and evolved from a development effort while a calculator chip set was being made. The 4004 microprocessor was the central component in the chip set, which was called the MCS-4. The other components in the set were a 4001 ROM, a 4002 RAM, and a 4003 shift register.

However, RISC can significantly improve its performance with a faster clock, more efficient pipelining, and compiler optimization. 18 depicts the functional block diagram of the PIC18F4321 microcontroller. The block diagram can be divided into three sections, namely, CPU, memory, and I/O (input/output). A brief description of these blocks will be provided in the following. The PIC18F4321 CPU contains registers, ALU, an instruction decode and control unit, along with the oscillator blocks. Typical CPU registers include IR (instruction register), W (accumulator), program counter (PC), three memory address registers (FSR0 through FSR2), and stack pointer (STKPTR).

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