Control circuit and power control method during reset thereof
A control circuit and power control technology, applied in the direction of the data reset device, etc., can solve the problems that the CPU cannot be completely reset, the system cannot be restarted after power failure, etc., and achieve the effects of low cost, elimination of hidden dangers, and reliable operation
Active Publication Date: 2013-09-11
HYTERA COMM CORP
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Problems solved by technology
[0014] The technical problem to be solved by the present invention is to provide a control system capable of completely resetting the CPU and not powering down the system when the CPU is reset, aiming at the defect that the CPU cannot be completely reset or the system cannot be restarted when the CPU is reset. The circuit and its power control method when it is reset
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[0046] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.
[0047] Figure 4 is a schematic structural diagram of a control circuit according to an embodiment of the present invention. In this embodiment, the control circuit includes a power supply 41 , a power supply control circuit 42 , a processor 43 , a logic device 44 and a reset circuit 45 .
[0048] The power supply 41 is connected with the power control circuit 42, the processor 43 and other circuit modules in the electronic device, and is used to supply power to the processor 43 and other circuit modules in the electronic device.
[0049]The power control circuit 42 is connected with the logic de...
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The invention discloses a control circuit and a power control method during reset thereof. The control circuit comprises a processor, a reset circuit, a logic device and a power control circuit, wherein the processor is used for generating a setting signal after a power-on signal is detected; the reset circuit is connected with the processor and used for outputting a reset signal and resetting the processor; the logic device is connected with the processor and used for generating a power control signal according to the setting signal which is generated by the processor and keeping an output state of the power control signal invariable during the reset of the processor; and the power control circuit is connected with the logic device and used for keeping a power supply on when receiving the power control signal which is generated by the logic device. In the invention, the logic device having a caching function keeps the output state of the power control signal invariable during the reset of the processor, so a system does not have a power failure when the processor is reset thoroughly.
Description
technical field [0001] The invention relates to the technical field of communication control, in particular to a control circuit and a power supply control method during reset. Background technique [0002] For an electronic product with a switch button, the user can control the power switch through the switch button. In order to prevent accidental touch, the control of the key must have a certain delay, which requires the processor to be able to detect the signal of the switch key, and control the power switch to respond to the corresponding switch operation. At the same time, for the protection of the whole product, in order to prevent the software from crashing and cannot be recovered, a hardware watchdog is added to the system to output a reset signal to the processor when the operation is abnormal, so as to re-initialize the processor and avoid crashing. [0003] Therefore, the reset switch circuit in the system control circuit must meet the following requirements: ...
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IPC IPC(8): G06F1/24
Inventor 王俊峰符昌述李红英
Owner HYTERA COMM CORP