WO2015014162A1

WO2015014162A1 - Apparatus and method for awakening mcu of soc chip

Info

Publication number: WO2015014162A1
Application number: PCT/CN2014/079559
Authority: WO
Inventors: 王光耀; 陈松涛
Original assignee: 深圳市汇顶科技股份有限公司
Priority date: 2013-07-30
Filing date: 2014-06-10
Publication date: 2015-02-05
Also published as: CN103412634A; CN103412634B

Abstract

Disclosed are an apparatus and a method for awakening an MCU of an SOC chip, which relate to the technical field of electronic circuits. The apparatus comprises an external awakening signal detection module, an interruption request generating module, a gated clock, and an interruption service program module. The external awakening signal detection module generates an internal awakening signal when an effective external awakening signal is detected. The interruption request generating module generates a gated clock enabling signal and an interruption request signal. The gated clock outputs a system clock to the interruption request generating module and an MCU according to the gated clock enabling signal, a sleep signal state and a register configuration signal state. After receiving the interruption request signal, the interruption service program module configures a gated clock control register to be in an effective state and generates an interruption exit signal and outputs the interruption exit signal to the MCU. By means of the present invention, awakening security is ensured, extra awakening is avoided, and system power consumption is effectively lowered.

Description

MCU wake-up device and method for S0C chip

Technical field

The present invention relates to the field of electronic circuit technologies, and in particular, to an MCU wake-up device and method for an SOC chip. Background technique

In order to reduce the power consumption of SOC (System on Chip) chips, most chips now have sleep and wake-up functions, and the system clock is turned off in sleep mode to reduce system power consumption. However, the method of waking up the MCU (Micro Control Unit) basically adopts a standard interface or directly wakes up the MCU with a single signal. Although the standard interface wake-up can well avoid the squeaking, but the wake-up timing is complicated, the chip must also have this interface. A single signal directly wakes up the MCU. Although it is easy to wake up, it is sensitive to the donkey and can easily cause additional wakeup. Summary of the invention

In view of the above, the technical problem to be solved by the present invention is to provide an MCU wake-up device and method for a SOC chip to solve an error wakeup caused by an external interference signal when a single signal is used to directly wake up the MCU.

The technical solution adopted by the present invention to solve the above technical problems is as follows:

According to an aspect of the present invention, an MCU wake-up device of an SOC chip includes an external wake-up signal detecting module, an interrupt request generating module, an interrupt service program module, and a gated clock, wherein: an external wake-up signal detecting module is configured to detect After the valid external wake-up signal, an internal wake-up signal is generated and output to the interrupt request generation module;

An interrupt request generation module is configured to generate a gated clock enable signal after receiving an internal wakeup signal Output to the gated clock, generate an interrupt request signal output to the interrupt service routine module;

a gated clock, outputting a system clock to an interrupt request generation module and an MCU according to a gated clock enable signal, a sleep signal state, and a register configuration signal state;

The interrupt service program module is configured to configure the gated clock control register to be in an active state after receiving the interrupt request signal, and generate an interrupt exit signal output to the MCU.

Preferably, the interrupt service program module is further configured to generate an internal wake-up signal clear signal output to the external wake-up signal detecting module; correspondingly, the external wake-up signal detecting module is further configured to receive the internal wake-up signal clear signal output by the interrupt service program module. , clear the internal wake-up signal.

Preferably, the effective external wake-up signal refers to a high level or low level signal for a predetermined period of time.

Preferably, the external wake-up signal detecting module comprises a counter, a comparator and a resetter, wherein: a counter, configured to sample and count the external wake-up signal under the excitation of the detection clock, and output the count value to the comparator; Receiving the counter value of the counter, and comparing the count value with a predetermined threshold value, when the counter value is greater than or equal to a predetermined threshold value, the internal wake-up signal is output, otherwise the internal wake-up signal is not output; the resetter is used for Receive external wake-up signal, internal wake-up signal and internal wake-up signal clear signal. When the internal wake-up signal clear signal is valid, or the external wake-up signal and internal wake-up signal are invalid, a valid counter reset signal is output to the counter, otherwise the output invalid counter is reset. Signal to the counter.

Preferably, the counter is specifically configured to: when the counter reset signal is valid, the count value is zero; when the counter reset signal is invalid, the count value is incremented by one each time the detection clock detects that the external wake-up signal is valid on the rising edge.

Preferably, the interrupt request generating module includes: an enable signal generating unit, a peer unit and a edge detecting unit, wherein: an enable signal generating unit, configured to receive an internal wake-up signal, generated according to an effective level of the internal wake-up signal Gated clock enable signal; the same unit, for receiving the system clock and the internal wake-up signal, the internal wake-up signal is the same as the system clock domain, and the internal wake-up signal is output to the edge detection unit; the edge detection Unit, used to detect the jump of the internal wake-up signal After the change edge, the interrupt request signal is output.

Preferably, the enable signal generating unit is specifically configured to: if the active level of the internal wake-up signal is high, the gated clock enable signal is an internal wake-up signal, otherwise the gated clock enable signal is the reverse of the internal wake-up signal value.

Preferably, the synchronizing unit is specifically configured to: when the rising edge of the system clock, sample the internal wake-up signal and update the internal wake-up signal to the same signal, when there is no system clock, the internal wake-up signal remains unchanged. According to another aspect of the present invention, an MCU wake-up method of an SOC chip includes: generating an internal wake-up signal after detecting a valid external wake-up signal;

Generating a clocked clock enable signal and an interrupt request signal according to an internal wake-up signal;

Outputting a system clock signal according to a gated clock enable signal, a gated clock control register state, and a sleep signal state;

The gating clock control register is configured to be in an active state, and an interrupt exit signal is generated to be outputted to, preferably, an internal wake-up signal is generated after detecting a valid external wake-up signal, further comprising: receiving an external wake-up signal;

Determine whether the external wake-up signal meets the wake-up requirement. If the wake-up request is not met, discard the wake-up signal and end the flow; if the wake-up request is met, an internal wake-up signal is generated.

The MCU wake-up device and method for the SOC chip provided by the present invention wake up the MCU with a single signal, but the external single signal is not directly used to wake up the MCU, and the external wake-up signal detection module filters out the fake wake-up signal, and then utilizes the detected true The wake-up signal is used to generate the system interrupt, and finally the MCU is completely woken up in the interrupt handler module, avoiding the error wake-up action generated by the external interference signal. Whether it is used for internal wake-up or external wake-up, it is simple and reliable, which not only ensures the security of wake-up, but also avoids the amount. DRAWINGS

FIG. 1 is a schematic structural diagram of an MCU wake-up device of an SOC chip according to an embodiment of the present invention. 2 is a schematic structural diagram of an external wake-up signal detecting module according to a preferred embodiment of the present invention. FIG. 3 is a schematic structural diagram of an interrupt request generating module according to a preferred embodiment of the present invention. FIG. 4 is a flowchart of an MCU wake-up method of an SOC chip according to an embodiment of the present invention.

FIG. 5 is a flowchart of an MCU wakeup method of a SOC chip according to a preferred embodiment of the present invention. detailed description

The present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It is understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

Embodiment 1

1 is a schematic structural diagram of an MCU wake-up device of an SOC chip according to an embodiment of the present invention. The device includes: an external wake-up signal detecting module 10, an interrupt request generating module 20, a gated clock 30, and an interrupt service program module 40. among them:

The external wake-up signal detecting module 10 is configured to generate an internal wake-up signal after detecting a valid external wake-up signal, and output the interrupt request generating module 20;

The interrupt request generation module 20 is configured to: after receiving the internal wake-up signal, generate a gated clock enable signal to the gated clock 30, and generate an interrupt request signal to the interrupt service program module 40;

a gated clock 30, configured to output a system clock to the interrupt request generation module 20 and the MCU according to the gated clock enable signal, the sleep signal state, and the gated clock register configuration signal state;

The interrupt service program module 40 is configured to configure the control register of the gated clock 40 to be in an active state after receiving the interrupt request signal, and generate an interrupt exit signal output to the MCU.

As a preferred solution of this embodiment, in order to enable the MCU to enter the sleep mode normally, the interrupt service program module 40 is further configured to generate an internal wake-up signal clear signal output to the external wake-up signal detecting module 10; correspondingly, externally The wake-up signal detecting module 10 is further configured to receive an interrupt service routine After the internal wake-up signal is cleared by the sequence module 40, the internal wake-up signal is cleared.

As another preferred embodiment of the present embodiment, in order to avoid additional wake-up, the effective external wake-up signal means that the external wake-up signal is a high level or low level signal for a predetermined period of time.

Specifically, the input signal of the external wake-up signal detecting module 10 is an external wake-up signal and a detection clock, and the external wake-up signal detecting module 10 generates an internal wake-up after detecting a valid external wake-up signal according to a certain standard under the excitation of the detection clock. The signal is output to the interrupt request generation module 20. The input signal of the interrupt request generating module 20 is an internal wake-up signal and a system clock, and the interrupt request generating module 20 generates a gated clock enable signal and an interrupt request signal respectively after receiving the internal wake-up signal, and outputs the gated clock enable signal. To the gated clock 30, the interrupt request signal is output to the interrupt service routine module 40; wherein the gated clock enable signal and the interrupt request signal are invalidated as the internal wake-up signal is invalid. The input signals of the gated clock 30 are a gated clock enable signal, a gated clock control register configuration signal, and a sleep signal. When it is detected that the gated clock enable signal is valid and the gated clock control register configuration signal is valid and the sleep signal is invalid. , output system clock, stop outputting system clock when it detects that the gate clock enable signal is invalid and the gate clock control register configuration signal is invalid and the sleep signal is valid. The input signal of the interrupt service program module 40 is an interrupt request signal, and the output signal is an internal wake-up signal clear signal, a gated clock control register configuration signal, and an interrupt exit signal, and the interrupt service program module 40 causes the MCU to enter an interrupt according to the received interrupt request signal. The service program configures the gated clock control register to an active state in the interrupt service routine, and then generates an internal wake-up signal clear signal, and finally generates an interrupt exit signal. The input signals of the MCU are the system clock and the interrupt exit signal. The MCU is the carrier of the interrupt service program module 40. The functions in the interrupt service program module 40 need to be completed by the MCU, and the sleep signal of the MCU entering the sleep mode is also sent by the MCU. Embodiment 2

FIG. 2 is a schematic structural diagram of an external wake-up signal detecting module according to a preferred embodiment of the present invention. The module includes a counter 101, a comparator 102, and a resetter 103, where:

a counter 101, configured to sample and count an external wake-up signal under the excitation of the detection clock, The count value is output to the comparator 102;

The comparator 102 is configured to receive the counter value of the counter 101, and compare the count value with a predetermined threshold value. When the counter value of the counter is greater than or equal to a predetermined threshold value, the internal wake-up signal is output, otherwise the internal wake-up signal is not output. ;

The resetter 103 is configured to receive an external wake-up signal, an internal wake-up signal, and an internal wake-up signal clear signal. When the internal wake-up signal clear signal is valid, or both the external wake-up signal and the internal wake-up signal are invalid, a valid counter reset signal is output to the counter 101. Otherwise, an invalid counter reset signal is output to the counter 101.

Specifically, the input signals of the counter 101 are an external wake-up signal, a detection clock, and a counter reset signal, and the output signal is a counter count value. The counter 101 samples and counts the external wake-up signal under the excitation of the detection clock, and then outputs the count value to Comparator 102. Among them, when the counter reset signal is valid, the counter 101 has a count value of zero, otherwise the value of the counter 101 is incremented by one every time the detection clock detects that the external wake-up signal is valid on the rising edge. The input signal of the comparator 102 is the count value of the counter 10, the output signal is an internal wake-up signal, and the comparator 102 functions to compare the count value and the threshold value of the counter 101. When the count value of the counter 101 is greater than or equal to the threshold value, the output is output. Internal wake-up signal, otherwise the internal wake-up signal is not output. The threshold value is a relatively fixed value. It represents the high level or low level of how many detection clock cycles the external wake-up signal lasts. It can be set differently depending on the application scenario. Value. The input signal of the resetter 103 is an external wake-up signal, an internal wake-up signal clear signal and an internal wake-up signal, and the output signal is a counter reset signal. When the internal wake-up signal clear signal is valid or the external wake-up signal and the internal wake-up signal are invalid, the output is output. A valid counter reset signal, otherwise an invalid counter reset signal is output.

In this embodiment, the working principle of the external wake-up signal detecting module is to use the counter 101 to count the external wake-up signal. When the count value of the counter 101 is greater than or equal to the threshold, the external wake-up signal is satisfied, and then the external wake-up condition is satisfied. An internal wake-up signal is generated. If the external wake-up signal transitions to an inactive state during counting, the resetter 103 generates a counter reset signal for clearing the counter count value, and when it is checked again that the external wake-up signal is valid, Restart counting. Obviously, the external wake-up signal detecting module can also be implemented by other means as long as it can be judged that the external wake-up signal is a high level or low level signal for a predetermined period of time. Embodiment 3

FIG. 3 is a schematic structural diagram of an interrupt request generating module according to a preferred embodiment of the present invention. The module includes an enable signal generating unit 201, a peer unit 202, and a edge detecting unit 203, wherein: an enable signal generating unit 201, configured to receive an internal wake-up signal, and generate a gated clock enable signal according to an active level of the internal wake-up signal;

The peer unit 202 is configured to receive the system clock and the internal wake-up signal, and compare the internal wake-up signal to the system clock domain, and output the internal wake-up signal to the edge detection unit 203;

The edge detection unit 203 is configured to output an interrupt request signal after detecting a transition edge of the internal wake-up signal.

Specifically, the input signal of the enable signal generating unit 201 is an internal wake-up signal, and the output signal is a gated clock enable signal, and the enable signal generating unit 201 generates a gated clock enable signal according to an active level of the internal wake-up signal. . Wherein, if the active level of the internal wake-up signal is high, the gated clock enable signal is equal to the internal wake-up signal, otherwise the gated clock enable signal is equal to the opposite value of the internal wake-up signal. The input signal of the peer unit 202 is the system clock and the internal wake-up signal, and the output is the internal wake-up signal homologous signal, and the peer unit 202 is used to clamp the internal wake-up signal to the system clock domain, that is, only on the rising edge of the system clock. The internal wake-up signal is sampled and the internal wake-up signal is updated. When there is no system clock, the internal wake-up signal remains unchanged. The input signal of the edge detection unit 203 is an internal wake-up signal and the output signal is an interrupt request signal, and the edge detection unit 203 is configured to detect the edge of the internal wake-up signal, that is, from the high level to A low level transition, or a low level to a high level transition, when a transition edge is detected, the edge detection unit 203 outputs a pulse signal of a system clock width, that is, an interrupt request signal. Embodiment 4

FIG. 4 is a flowchart of an MCU wakeup method of an SOC chip according to an embodiment of the present invention, where the method includes the following steps:

The S40 U generates an internal wake-up signal after detecting a valid external wake-up signal;

5402. Generate a gated clock enable signal and an interrupt request signal according to the internal wakeup signal.

5403. Output a system clock signal according to the gated clock enable signal, the gated clock control register state, and the sleep state;

5404. Configure the gated clock control register to be in an active state, and generate an interrupt exit signal output to the MCU.

It should be noted that, in this embodiment, the MCU sleep and wake-up are implemented by a gated clock. When the gated clock is turned off, the MCU enters a sleep state, and when the gated clock is turned on, the MCU starts to work. When the MCU needs to go to sleep, the MCU only needs to issue a sleep command, and it can immediately go to sleep. In order to ensure the security of wake-up and avoid interference from external wake-up signals, the wake-up process is relatively complicated, and the MCU will start to work normally when the above conditions are met. Embodiment 5

FIG. 5 is a flowchart of an MCU wake-up method of a SOC chip according to a preferred embodiment of the present invention, where the S50 U receives an external wake-up signal;

5502, determining whether the external wake-up signal meets the wake-up request, if the wake-up request is not met, executing step S503; if the wake-up request is met, executing step S504;

Among them, the external wake-up signal that satisfies the wake-up requirement should be a high level or low level signal that lasts for a while.

5503. Discard the wake-up signal and end the process;

5504, generating an internal wake-up signal;

5505. Generate a gated clock enable signal and an interrupt request signal according to an internal wake-up signal.

5506. According to the gated clock enable signal, the gated clock, the control register state, and the sleep signal state. Output system clock signal;

5507. Configure the gated clock control register to be in an active state, generate an internal wake-up signal clear signal, and generate an interrupt exit signal output to the MCU.

5508. Clear the internal wake-up signal.

Specifically, the external wake-up signal is a single wake-up signal external to the MCU, and the external wake-up signal detecting module analyzes the received external wake-up signal. If the external wake-up signal does not meet the requirement, the current wake-up request is discarded, and the MCU does not Wake-up, if the external wake-up signal meets the requirements, the external wake-up signal detection module generates an internal wake-up signal of a certain level according to the external wake-up signal, and maintains this level, and then the internal wake-up signal is used as the gated clock. The signal can be used to turn on the gated clock and serve as the interrupt request input signal of the MCU. When the MCU operating clock is turned on, the interrupt request can be detected. Then the MCU enters the interrupt service routine. In the interrupt service routine, the software configures the gated clock control register as The active state, then generating an internal wake-up signal clear signal that maintains a certain level for a period of time, is used to clear the internal wake-up signal. Since the gated clock control register is already active, the gated clock remains on until the next sleep. Start.

The preferred embodiments of the present invention have been described above with reference to the drawings, and are not intended to limit the scope of the invention. A person skilled in the art can implement the invention in various variants without departing from the scope and spirit of the invention. For example, the features of one embodiment can be used in another embodiment to obtain a further embodiment. Any modifications, equivalent substitutions and improvements made within the technical concept of the invention are intended to be included within the scope of the invention.

Industrial applicability

The MCU wake-up device and method for the SOC chip provided by the embodiment of the present invention wake up the MCU by using a single signal, but the external single signal is not directly used to wake up the MCU, and the external wake-up signal detecting module filters out the fake wake-up signal, and then detects the detected The real wake-up signal generates a system interrupt, and finally wakes up the MCU completely in the interrupt handler module, avoiding the error wake-up action generated by the external interference signal. Whether it is used for internal wake-up or external wake-up, it is simple and reliable, which not only ensures the security of wake-up, but also avoids additional wake-up and reduces system power consumption more effectively.

Claims

claims

1. An MCU wake-up device for SOC chips. The device includes: an external wake-up signal detection module, an interrupt request generation module, an interrupt service program module and a gate control clock, where:

The external wake-up signal detection module is used to generate an internal wake-up signal after detecting a valid external wake-up signal, and output it to the interrupt request generation module;

The interrupt request generation module is configured to, after receiving an internal wake-up signal, generate a gated clock enable signal and output it to the gated clock, and generate an interrupt request signal and output it to the interrupt service program module; the gated clock, Output the system clock to the interrupt request generating module and the MCU according to the gated clock enable signal, sleep signal status and register configuration signal status;

The interrupt service program module is used to configure the gate clock control register to a valid state after receiving the interrupt request signal, and generate an interrupt exit signal and output it to the MCU.

2. The MCU wake-up device of the SOC chip according to claim 1, wherein the interrupt service program module is also used to generate an internal wake-up signal clear signal and output it to an external wake-up signal detection module; accordingly, the external wake-up signal The detection module is also configured to clear the internal wake-up signal after receiving the internal wake-up signal clear signal output by the interrupt service program module.

3. The MCU wake-up device of the SOC chip according to claim 1 or 2, wherein the effective external wake-up signal refers to a high-level or low-level signal that lasts for a predetermined period of time.

4. The MCU wake-up device of the SOC chip according to claim 3, wherein the external wake-up signal detection module includes a counter, a comparator and a reset, wherein:

The counter is used to sample and count the external wake-up signal under the stimulation of the detection clock, and output the count value to the comparator;

The comparator is used to receive the count value of the counter and compare the count value with a predetermined threshold value. When the count value of the counter is greater than or equal to the predetermined threshold value, output an internal wake-up signal, otherwise not Output internal wake-up signal;

The resetter is used to receive external wake-up signals, internal wake-up signals and internal wake-up signal clearing signal, when the internal wake-up signal clear signal is valid, or both the external wake-up signal and the internal wake-up signal are invalid, a valid counter reset signal is output to the counter, otherwise an invalid counter reset signal is output to the counter.

5. The MCU wake-up device of the SOC chip according to claim 4, wherein the counter is specifically used to: when the counter reset signal is valid, the count value is zero; when the counter reset signal is invalid, whenever the detection clock is rising When the external wake-up signal is detected as valid, the count value is incremented by 1.

6. The MCU wake-up device of the SOC chip according to claim 1 or 2, wherein the interrupt request generation module includes: an enable signal generation unit, a synchronization unit and a transition edge detection unit, wherein: the enable A signal generation unit, used to receive an internal wake-up signal and generate a gated clock enable signal according to the effective level of the internal wake-up signal;

The synchronization unit is used to receive the system clock and the internal wake-up signal, synchronize the internal wake-up signal to the system clock domain, and output the internal wake-up signal synchronization signal to the transition edge detection unit;

The transition edge detection unit is used to output an interrupt request signal after detecting the transition edge of the internal wake-up signal synchronization signal.

7. The MCU wake-up device of the SOC chip according to claim 6, wherein the enable signal generating unit is specifically configured to: if the effective level of the internal wake-up signal is high level, then the gated clock enable signal is Internal wake-up signal, otherwise the gated clock enable signal is the opposite value of the internal wake-up signal.

8. The MCU wake-up device of the SOC chip according to claim 6, wherein the synchronization unit is specifically configured to: when at the rising edge of the system clock, sample the internal wake-up signal and update the internal wake-up signal synchronization signal, when When there is no system clock, the internal wake-up synchronization signal remains unchanged.

9. An MCU wake-up method for SOC chips. The method includes:

Generates an internal wake-up signal after detecting a valid external wake-up signal;

Generate gated clock enable signal and interrupt request signal based on internal wake-up signal;

Output the system clock signal according to the gated clock enable signal, gated clock register status and sleep signal status;

Configure the gated clock control register to a valid state and generate an interrupt exit signal output to

10. The MCU wake-up method of the SOC chip according to claim 9, wherein the step of generating an internal wake-up signal after detecting a valid external wake-up signal further includes:

Receive external wake-up signal;

Determine whether the external wake-up signal meets the wake-up requirements. If the wake-up requirements are not met, the current wake-up signal is discarded and the process ends; if the wake-up requirements are met, an internal wake-up signal is generated.