Detecting device for detecting an operating mode of a system and detecting method thereof
AssigneeLeadtrend Technology Corp.
InventorsYi-Shan Chu, Hsing-Kuo Chao
Life of this patent
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Abstract
A detecting device for detecting an operating mode is disclosed. The detecting device includes a pulse generator and a hold-up unit. The pulse generator is disposed for issuing a one-shot pulse signal in response to each of button signals respectively. The hold-up unit is disposed for receiving the button signals to respectively generate delayed button signals by way of clock delay determined by a clock signal. The one-shot pulse signal and the delayed button signals are used to determine an operating mode of a system.
Claims14
A detecting device for detecting an operating mode, comprising:
- a pulse generator, for issuing a one-shot pulse signal in response to each of a plurality of button signals respectively;
- and
- a hold-up unit, for receiving the button signals to respectively generate delayed button signals by way of clock delay determined by a clock signal, each delayed button signal uniquely corresponding to one of the button signals, wherein the hold-up unit comprises hold-up circuits, respectively receiving the button signals and generating the delayed button signals, wherein one of the hold-up circuits comprises:
- a latch circuit, for generating a corresponding delayed button signal, wherein one input of the latch circuit is able to be triggered by a first edge of a corresponding button signal such that a level of the corresponding delayed button signal is changed to and latched at a first level;
- and
- a clock delay circuit for receiving the clock signal, wherein, after the clock delay circuit is triggered by a second edge of the corresponding button signal and a predetermined time period determined by the clock signal has elapsed, the clock delay circuit triggers another input of the latch circuit to change the level of the corresponding delayed button signal to a second level;
- wherein the one-shot pulse signal and the delayed button signals are used to determine an operating mode of a system.
A method for detecting an operating mode, comprising:
- providing buttons for generating button signals respectively;
- outputting a one-shot pulse signal in response to anyone of the button signals;
- generating a delayed button signal corresponding to one of the button signals by way of clock delay determined by a clock signal, each delayed button signal uniquely corresponding to one of the button signals, wherein the step of generating the delayed button signal comprises:
- providing a latch circuit to generate the delayed button signal;
- triggering the latch circuit by a first edge of the button signal to make a level of the delayed button signal changed to and latched at a first level;
- providing a clock delay circuit for receiving the clock signal;
- triggering the clock delay circuit by a second edge of the button signal;
- and
- after the clock delay circuit is triggered by the button signal and a predetermined time period determined by the clock signal has elapsed, triggering the latch circuit to change the level of the delayed button signal to a second level;
- and
- determining an operating mode of a system according to the one-shot pulse signal and the delayed button signal.
Dependencies are inferred from the claim text.