By Joseph J. Carr
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Extra info for Z80 technical manual
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.