JP2003316759A - Operation mode changing device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To automate the operation mode changing process executed conventionally by software, without requiring confirmation of a condition for the change when the operation mode of a microcomputer is changed. <P>SOLUTION: The operation mode changing device has a mode register 106 for setting the motion mode of the microcomputer, a plurality of condition flags 101, 102 and 103 indicating conditions for allowing the operation mode change, a load signal producing part 104 for producing a load signal 105 based on the theoretical product of the plurality of condition flags, and a pre-mode register 107 for storing the data loaded to the mode register 106 based on the load signal 105. The data setting in the pre-mode register 107 is executed based on the command of the microcomputer. <P>COPYRIGHT: (C)2004,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to control of operation mode transition of a microcomputer, and more particularly to an operation mode transition device having an allowance condition.

[0002]

2. Description of the Related Art Generally, a microcomputer can control operation modes such as sleep and speed reduction, and the operation modes are changed by external factors such as register rewriting by instructions and interrupts.

FIG. 6 shows the configuration of an operation mode control unit of such a conventional microcomputer. In FIG. 6, reference numeral 601 denotes a mode register section rewritable by an instruction,
Reference numeral 602 is an interrupt signal used when the microcomputer is activated from a standby mode such as sleep or stop. For example, when the sleep mode is set in the mode register unit 601 by an instruction, the microcomputer shifts to the sleep state and returns to the normal operation state by the interrupt signal 602.

[0004]

However, in recent years,
Confirmation of operating mode transition conditions has become difficult due to the complexity and division of software. Nevertheless, in order to reduce the consumption of mobile terminals and the like, it is often necessary to put the microcomputer into the sleep / low-speed mode.

In the conventional operation mode control method, the operation mode cannot be transitioned unless the conditions of a plurality of divided software and the operation status of hardware are all confirmed.
The operating time of the microcomputer for this confirmation is increasing. Further, there is a problem that the situation is changed during confirmation, and the operation mode is changed even though the operation mode cannot be changed.

The present invention solves the above-mentioned problems of the prior art. It is not necessary to confirm the transition condition when changing the operation mode of the microcomputer, and the operation of changing the operation mode, which is conventionally performed by software, can be automated. An object is to provide a mode transition device.

[0007]

In order to solve this problem, an operation mode transition device according to claim 1 of the present invention comprises a mode register (106) for setting an operation mode of a microcomputer and an operation mode transition. A plurality of condition flags (101, 102, 103) indicating a permissible condition, a load signal generation unit (104) that generates a load signal by logical product of the plurality of condition flags, and a mode register based on the load signal. A pre-mode register (107) for storing data to be loaded.

According to the above configuration, since the operation mode is automatically changed when the condition flags indicating the transition condition of the operation mode are prepared, it is not necessary to confirm the transition condition when changing the operation mode of the microcomputer. .

An operation mode transition device according to a second aspect of the present invention is the operation mode transition device according to the first aspect, wherein the plurality of condition flags are a plurality of flag signals from a peripheral circuit of the microcomputer. is there.

According to the above structure, the timing of the operation mode transition can be adjusted to the state of the peripheral circuit.
It is possible to prevent an operation mode change error due to a change in the state of the peripheral circuit during the state confirmation operation by the microcomputer.

An operation mode transition device according to a third aspect of the present invention is the operation mode transition device according to the first or second aspect, wherein the plurality of condition flags can be rewritten by an instruction of a microcomputer.

According to the above configuration, since the conditions in the tasks of the plurality of software can be managed by the condition flag, the mode transition can be performed automatically without checking the states of the plurality of tasks.

An operation mode transition device according to a fourth aspect of the present invention is the conditional operation mode transition device according to any one of the first to third aspects, further comprising a timer function for enabling the plurality of condition flags. It is a thing.

According to the above configuration, the operation mode change timing can be set freely, so that if there is no state in which the operation mode is changed within a certain period of time, it is possible to shift to the standby mode. The processing can be automated.

[0015]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings. (Embodiment 1) FIG. 1 is a block diagram showing a configuration of an operation mode transition apparatus according to Embodiment 1 of the present invention. In FIG. 1, 101, 102, and 103 are a plurality of condition flags for confirming whether the operation mode can be changed, 1
Reference numeral 04 is a load signal generation unit that takes an AND condition of all condition flags and generates a load signal 105, 106 is a mode register unit that sets the operation mode of the microcomputer, 107 is a pre-mode for storing the data to be loaded next It is a register part.

A plurality of condition flags 101, 102, 103
Is connected to the load signal generator 104, and when the AND condition of all condition flags is taken, the load signal 105
To generate. The load signal 105 is the mode register unit 10
6 and the data in the pre-mode register unit 107 is transferred to the mode register unit 106 when this signal is enabled.
To load. The data setting to the pre-mode register 107 is performed by the instruction of the microcomputer.

Next, the operation of the operation mode transition device having the above configuration will be described with reference to the flow chart shown in FIG. First, in step 201, the value of the pre-mode register is set to the operation mode to be transferred next using the instruction of the microcomputer. After that, in step 202, when the conditions due to various factors are met, the load signal is enabled by the AND condition of the condition flags. Thereby,
In step 203, the mode register is loaded with the value of the pre-mode register, and in step 204, the operation mode of the microcomputer is changed.

As described above, according to this embodiment, since the operation mode is automatically changed when the condition flags indicating the transition conditions of the operation mode are prepared, the transition condition is confirmed when the operation mode of the microcomputer is changed. It is not necessary to do so, and it is possible to automate the process of changing the operation mode, which is conventionally performed by software.

(Second Embodiment) FIG. 3 is a block diagram showing a configuration of an operation mode transition device according to a second embodiment of the present invention. It should be noted that the same parts as those shown in the first embodiment in FIG. In FIG.
Reference numerals 301, 302 and 303 denote a plurality of peripheral circuits of the microcomputer, each of which provides flag signals 304, 305 and 306 for confirming whether or not the operation mode of the microcomputer can be changed.

A plurality of flag signals 304, 305, 306
Is connected to the load signal generator 104, and when the AND condition of all condition flags is taken, the load signal 105
To generate. The load signal 105 is the mode register unit 10
6 and the data in the pre-mode register unit 107 is transferred to the mode register unit 106 when this signal is enabled.
To load. The data setting to the pre-mode register 107 is performed by the instruction of the microcomputer.

As described above, according to the present embodiment, the flag signal from the microcomputer peripheral circuit is used as the condition flag in the first embodiment, and the flag signal indicating the transition condition of the operation mode is automatically operated. Since the mode is changed, it is possible to match the timing of operation mode transition with the state of the peripheral circuit, and it is possible to prevent an operation mode change mistake due to the state change during the state confirmation operation of the peripheral circuit.

(Embodiment 3) FIG. 4 is a block diagram showing a configuration of an operation mode transition apparatus according to Embodiment 3 of the present invention. It should be noted that the same parts as those shown in the first embodiment in FIG. In FIG.
Reference numeral 401 denotes a register in which a plurality of condition flags in the first embodiment can be changed by an instruction of a microcomputer. Each bit position 402 of the register 401,
403 and 404 are the condition flags 101 and 101 of FIG. 1, respectively.
It corresponds to 102 and 103.

Each bit output of the register 401 is connected to the load signal generator 104, and the AN of all condition flags is output.
When the D condition is taken, the load signal 105 is generated. The load signal 105 is connected to the mode register unit 106, and when this signal is enabled, the pre-mode register unit 10
7 data is loaded into the mode register unit 106. The data setting to the pre-mode register 107 is performed by the instruction of the microcomputer.

As described above, according to the present embodiment, the condition flag of the first embodiment can be used as a register for accumulating the operating status of software by making it a register which can be changed by the instruction of the microcomputer. Since it is possible to automatically change the operation mode when the transition conditions of the operation mode are satisfied, it is possible to automatically perform operation management of the software divided into a plurality of pieces.

(Embodiment 4) FIG. 5 is a block diagram showing a configuration of an operation mode transition device according to Embodiment 4 of the present invention. It should be noted that the same parts as those shown in the first embodiment in FIG. In FIG.
Reference numerals 501, 502, and 503 are precondition flags that store data to be loaded into the condition flags at preset times, and 504 is a timer for adjusting the time to load the precondition flags into the condition flags.

A wait time until the mode is changed is set in the timer 504 in advance. When the timer 504 reaches the set time, the precondition flags 501, 50
The contents of 2, 503 are condition flags 101, 10 respectively.
2, 103 is loaded.

As described above, according to the present embodiment, the wait time until the mode is changed can be set by controlling the time when the data is set in the condition flag. As a result, the operation mode is automatically changed when the condition flags indicating the transition conditions of the operation mode are prepared, so that it is not necessary to confirm the transition condition when the operation mode of the microcomputer is changed.

[0028]

As described above, according to the present invention,
Since the operation mode transition is automatically performed when the condition flags are complete, it is not necessary to check the status when the operation mode is changed by the microcomputer, and the operation mode change processing that was performed by conventional software can be automated. You can

Further, according to the present invention, since the timing of the operation mode transition can be matched with the state of the peripheral circuit, the operation mode change error due to the change of the state of the peripheral circuit during the state confirmation operation in the microcomputer can be prevented. Can be prevented.

Furthermore, according to the present invention, since the conditions in the tasks of a plurality of software can be managed, the mode transition can be automatically performed without checking the states of the plurality of tasks. As a result, it is possible to automatically manage the operation of the divided software.

Further, according to the present invention, the operation mode change timing can be set freely, so that if there is no state in which the operation mode is changed within a certain period of time, it is possible to shift to the standby mode by using the conventional software. The processing that was being performed can be automated.

[Brief description of drawings]

FIG. 1 is a block diagram showing a configuration of an operation mode transition device according to a first embodiment of the present invention.

FIG. 2 is a flowchart showing an operation of the operation mode transition device according to the first embodiment of the present invention.

FIG. 3 is a block diagram showing a configuration of an operation mode transition device according to a second embodiment of the present invention.

FIG. 4 is a block diagram showing a configuration of an operation mode transition device according to a third embodiment of the present invention.

FIG. 5 is a block diagram showing a configuration of an operation mode transition device according to a fourth embodiment of the present invention.

FIG. 6 is a diagram showing a configuration of an operation mode control unit of a conventional microcomputer.

[Explanation of symbols]

101, 102, 103 Condition flags 104 Load signal generation unit 105 Load signal 106 Mode register unit 107 Pre-mode register units 301, 302, 303 Microcomputer peripheral circuits 304, 305, 306 Flag signal 401 Registers 402, 403, 404 Condition flags Corresponding to 501, 502, 503 Precondition flag 504 Timer

Claims (4)

[Claims] 1. A mode register for setting an operation mode of a microcomputer, a plurality of condition flags indicating an allowable condition of operation mode transition, and a load signal generation section for generating a load signal by logical product of the plurality of condition flags. And a pre-mode register that stores data to be loaded into the mode register based on the load signal. 2. The operation mode transition device according to claim 1, wherein the plurality of condition flags are a plurality of flag signals from a peripheral circuit of the microcomputer. 3. The operation mode transition device according to claim 1, wherein the plurality of condition flags are rewritable by an instruction of a microcomputer. 4. The conditional operation mode transition device according to claim 1, further comprising a timer function for validating the plurality of condition flags.