Miscellaneous active electrical nonlinear devices – circuits – and – Signal converting – shaping – or generating – Rectangular or pulse waveform width control
Patent
1996-03-08
1997-05-20
Callahan, Timothy P.
Miscellaneous active electrical nonlinear devices, circuits, and
Signal converting, shaping, or generating
Rectangular or pulse waveform width control
327 31, 327291, 327 24, H03K 504, H03K 5135, H03K 708
Patent
active
056315929
ABSTRACT:
A pulse generation and sensing arrangement in a microprocessor system (100) includes an input/output terminal (130) which receives an input signal or produces an output signal, an edge detector (132) which senses pulse edges in the input signal, timers (108, 110) which produce time values, registers (120, 124, 126) which hold time values produced by the timers corresponding to edges detected by the edge detector or which hold values corresponding to pulse edges to be generated, comparators which compare the values held in the registers with time values produced by the timers, and a flip-flop (128) for generating a signal whose state changes in response to the comparators. The arrangement allows the generation and/or sensing of signals with short pulse widths and a wide range of duty cycles, and minimizes software overhead. A continuous PWM signal may be generated without further software involvement after initial writing of edge values.
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Huston, Jr. William D.
Schwarz Roland H.
Callahan Timothy P.
Lam T.
Motorola Inc.
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