Microprocessor Interfacing by R.E. Vears

By R.E. Vears

This publication presents assurance of the enterprise and Technician schooling council (BTEC) point NIII unit in Microprocessor Interfacing (syllabus U86/335). even though, it may be considered as a textbook in interfacing for a wider variety of reports. The textual content concentrates at the standard 6502, Z80 and 6800/02 microprocessor households, info of that are contained in Heinemann's Checkbook sequence, "Microelectronic platforms NII/NIII. easy information of common interfacing units for every of those microprocessors are integrated within the textual content

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Write a Z80 assembly language program to enable a triangular waveshape to be generated at the output of the DAC. A 6800/02 based microcomputer with a 6821 PIA located at address $8004 has an 8-bit DAC connected to its output port. Write a 6800 as­ sembly language program to enable a triangular waveshape to be gener­ ated at the output of the DAC. Explain how the speed of a small DC motor may be controlled by: (a) Digital (pulse width modulation) control. (b) Analogue control. A 6502 based microcomputer with a 6530/32 PIA is used to control the speed of a small DC motor.

4(a) and (b). 50 D to A conversion SOC pulse Clock "î Î EOC pulse î* Successive approximation register n) z. „ \. Digital ° ! 4 Parallel (flash) converter In this type of ADC a resistor network is used to generate a number of differ­ ent reference potentials, one for each bit of the converter. 5. The analogue input signal is applied to the second input of each compara­ tor and is thus compared simultaneously with each of the reference poten­ tials. All comparator outputs change logic state if their reference potential exceeds their analogue input while the outputs of the remainder do not change state.

Write a 6800 as­ sembly language program to enable a triangular waveshape to be gener­ ated at the output of the DAC. Explain how the speed of a small DC motor may be controlled by: (a) Digital (pulse width modulation) control. (b) Analogue control. A 6502 based microcomputer with a 6530/32 PIA is used to control the speed of a small DC motor. 19. 19 The speed of the motor depends upon the switch settings as follows: Si So Speed Off Off On On Off On Off On Stop 1/3 maximum 2/3 maximum Full speed Write programs using 6502 assembly language to provide: (a) Pulse width modulation control.

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