By Robert J. Simpson
Advent to 6800/6802 Microprocessor structures: undefined, software program and Experimentation introduces the reader to the good points, features, operation, and purposes of the 6800/6802 microprocessor and linked relations of units. Many labored examples are integrated to demonstrate the theoretical and useful elements of the 6800/6802 microprocessor.
Comprised of six chapters, this ebook starts off by means of offering numerous elements of electronic platforms earlier than introducing the suggestions of fetching and execution of a microprocessor guide. information and outlines of parts (MPU, RAM, ROM, PIA, etc.) invaluable for the layout and implementation of devoted structures also are thought of. next chapters concentrate on how the 6800/6802 microprocessor should be programmed on the machine-code point and by way of assembler programming concepts; the rules occupied with interfacing the MPU process to peripheral apparatus; sensible elements of parallel and serial info move thoughts utilizing the PIA and ACIA, respectively; and software program good points of the Motorola MEK6802D5E overview approach. The publication concludes via discussing info of 12 investigations that might be undertaken utilizing the MEK6802D5E review system.
This monograph is meant for college students, technicians, scientists, and engineers.
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Additional info for Introduction to 6800/6802 Microprocessor Systems. Hardware, Software and Experimentation
The valid memory address (VMA) line, pin 5, is a non-tri-state output, which can be used when in the high state to indicate to peripheral chips that there is a valid address on the address bus. Pin 6 is the active-low Non-Maskable Interrupt (NMI) input. The M P U will respond to this interrupt input signal irrespective of the state of the interrupt mask bit (I) in the Condition Code Register after completing execution of the current instruction. Before vectoring to the corresponding interrupt routine the status of the M P U registers will be saved (stacked) in memory and the interrupt mask bit (I) will be set (1 = 1), thereby inhibiting I R Q interrupts.
Iii) R O M . (iv) Volatile. (v) Address code. (vi) Chip select input. (vii) Read/write signal. (viii) Access time. 15 What is the purpose of incorporating an ALU in the architecture of a microprocessor? 1 Introduction A microprocessor-based system (microcomputer) normally consists of a number of interconnected integrated circuits. The block diagram of a simple system comprising a microprocessor unit (MPU), memory for storing instructions and data, and some input/output (I/O) capability, is shown in Fig.
An additional one or two bytes of program may be required to be read into the M P U as determined by the decoded first byte, which is the case for two- and three-byte instructions. This one, two- or three-byte instruction, which has been fetched into the M P U , is then executed. A simple example of a two-byte instruction will illustrate the M P U operation. Consider the case where we wish to load Accumulator A in the M P U , using the appropriate immediate addressing mode instruction, with data of value 6E.