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A kind of wake-up method of serial port controller and microcontroller system based on it
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A technology of microcontrollers and controllers, which is applied in the direction of program control in sequence/logic controllers, general control systems, control/regulation systems, etc., can solve problems such as large system power consumption, and achieve the effect of reducing system power consumption
Active Publication Date: 2017-09-29
GIGADEVICE SEMICON (BEIJING) INC
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[0006] The object of the present invention is to propose a serial port controller and a method for waking up a microcontroller system based on it, which can solve the problem of large power consumption of the system in the existing waking technology
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Embodiment 1
[0044] figure 1 It is a flow chart of the method for waking up the microcontroller system based on the serial port controller provided by Embodiment 1 of the present invention. Such as figure 1 As shown, the wake-up method includes:
[0045] Step 101, in the low power consumption mode, determine whether a frame start marker is detected. If a start-of-frame marker is detected, perform the following steps:
[0046] In this step, the frame start marker is detected in real time, and the frame start marker may be a falling edge signal. In the process of detecting the frame start mark, there is no need to use the serial port working clock.
[0047] Step 102, turn on the clock switch circuit to generate the working clock of the serial port.
[0048] In this step, a working clock of the serial port is generated to be able to receive the current data frame.
[0049] Step 103, receiving the current data frame.
[0050] In this step, the current data frame corresponding to the det...
Embodiment 2
[0066] figure 2 It is a structural diagram of the serial port controller provided by Embodiment 2 of the present invention. The serial port controller provided in Embodiment 2 of the present invention can implement the wake-up method described in Embodiment 1 of the present invention. Such as figure 2 As shown, the serial port controller includes: configuration register 201, frame start detection circuit 202, data frame receiving circuit 203, received frame content analysis circuit 204 and clock switch circuit 205, frame start detection circuit 202 is connected with clock switch circuit 205, receives The frame content analysis circuit 204 is connected to the configuration register 201 and the data frame receiving circuit 203 respectively.
[0067] The configuration register 201 is used to store wake-up frames.
[0068] Preferably, the configuration register 201 can also be connected to the system bus 206 in the microcontroller system through the bus interface, and configu...
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Abstract
The invention discloses a serial port controller and an awakening method for a micro-controller system based on the same. The awakening method includes that judging whether a frame starting mark is detected under a low-power consumption mode, if the frame starting mark is detected, opening a clock switching circuit to generate a serial port working clock; receiving a current data frame; judging whether the current data frame is matched with an awakening frame, if so, generating awakening interruption, and awakening the micro-controller system. The serial port controller and the awakening method for the micro-controller system based on the same do not open the clock switching circuit to generate the serial port working clock until the frame starting mark is detected, and the system power consumption under the low-power consumption mode is lowered.
Description
technical field [0001] The invention relates to the technical field of electronic circuits, in particular to a serial port controller and a method for waking up a microcontroller system based on it. Background technique [0002] In a microcontroller (MCU, Micro Control Unit) chip system, in order to reduce standby power consumption, the chip usually has one or more low power consumption modes. After the chip enters the low power consumption mode, most of the clocks inside the chip will be turned off, and the central processing unit (CPU, Central Processing Unit) cannot continue to execute software instructions. It is necessary to wake up the chip at an appropriate time to make the chip return to normal working status. [0003] Existing wake-up technologies mainly include CPU interrupt wake-up and peripheral device wake-up. [0004] The CPU interrupt wake-up mainly uses the wake-up function integrated in the CPU module. In low power consumption mode, when the CPU wake-up p...
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