JP2012027575A - Electronic device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an electronic device enabling data transfer in which the number of interruptions to an arithmetic control means is reduced so as to reduce the load on the arithmetic control means.SOLUTION: The electronic device comprises: a DMA control means for performing a DMA transfer control in transferring data received by an interface means to a memory; the interface means for transmitting an event notification signal when receiving the data; and an event notification means for reading an event status of the interface means when receiving the event notification signal, determining whether the event is caused by a data transfer request or an error processing request, transmitting a data transfer request signal to the DMA control means if it is caused by the data transfer request, and transmitting an error processing request signal to the arithmetic control means if it is caused by the error processing request.

Description

  The present invention relates to an electronic apparatus including a DMA control unit that performs DMA transfer control for data transfer between memories of data received by an interface unit, and an arithmetic control unit that executes a predetermined process based on data. This relates to an electronic device that enables data transfer between the interface means and the memory in the microcomputer provided in the electronic device by reducing the number of interruptions to the arithmetic control means and reducing the load on the arithmetic control means. is there.

  The electronic device may be any device and includes, for example, a network device, a field device, and the like. Field devices are installed in water purification plants, plants, etc., measure physical quantities (eg, flow rate, water level, pressure, temperature, etc.) and output electrical signals according to the measurement results. Instruments, various flow meters, thermometers, valve positioners, etc.

  Also, field devices are often used in automation and process control techniques to measure process variables as sensors and to control control variables as actuators.

FIG. 3 is an explanatory diagram illustrating an example of a conventional electronic device.
In FIG. 3, an electronic device 1 is a microcomputer 10 that controls the entire electronic device 1 to perform operations specific to the device, and an input / output device such as a sensor unit that transmits / receives signals to / from the electronic device 1 via a connection line 11. Means (input / output device) 12.

  The microcomputer 10 and the input / output means 12 are electrically connected via a connection line 11 such as a bus and an interface means (described later) in the microcomputer 10.

  The microcomputer 10 includes an arithmetic control unit 10a such as a CPU (Central Processing Unit), a memory 10b such as a RAM (Random Access Memory) that is an example of a storage unit, and an interface unit 10c that transmits and receives data to and from the input / output unit 12. A data transfer permission signal generating means 10d and a DMA control means 10e.

  The arithmetic control unit 10a, the memory 10b, the interface unit 10c, the data transfer permission signal generation unit 10d, and the DMA control unit 10e are connected to each other via a bus 10f that is an example of a connection line.

  The arithmetic control means 10a is connected to the data transfer permission signal generating means 10d through the connection line 10g. The data transfer permission signal generation means 10d is connected to the DMA control means 10e via the connection line 10h.

  The memory 10b mainly stores various information such as programs and applications for operating as the electronic device 1 (for example, field devices) and data used when executing these programs.

When the interface means 10c receives data from the input / output means 12 via the connection line 11, the interface means 10c transmits an “interrupt signal” to the arithmetic control means 10a via the connection line 10f.
The interface unit 10c has a status register for storing data indicating an error status and a data transfer request status.

As the interrupt signal output by the interface unit 10c, “error processing request interrupt” and “data transfer request interrupt” are output as the same interrupt.
In determining the type of interrupt signal factor, the arithmetic control unit 10a reads the status information from the status register in the interface unit 10c to identify the interrupt factor.
Further, the interface unit 10c performs data transmission / reception with the memory 10b based on a control signal from the DMA control unit 10e.

  The arithmetic control unit 10a reads the program from the memory 10b and activates the system of the electronic device 1, and controls the interface unit 10c, the data transfer permission signal generation unit 10d, and the DMA control unit 10e to control the entire electronic device 1.

  When the arithmetic control means 10a receives an interrupt signal from the interface means 10c, it reads the interrupt status in the interface means 10c via the bus 10f and the connection line 11, and analyzes the cause of the interrupt.

As a result of the analysis of the interrupt factor, when the interrupt factor is a data transfer request (when the interface unit 10c normally receives data from the input / output unit 12), the arithmetic control unit 10a determines that the "data transfer start signal" Is output to the data transfer permission signal generating means 10d through the connection line 10g.
The arithmetic control unit 10a performs error processing when the interrupt factor is an error as a result of the analysis of the interrupt factor.

  When receiving the data transfer start signal, the data transfer permission signal generation means 10d outputs a “data transfer permission signal” to the DMA control means 10e via the connection line 10h.

  When receiving the data transfer permission signal, the DMA control means 10e performs DMA (Direct Memory Access) transfer control for data transfer between the interface means 10c and the memory 10b of various data including the data received by the interface means 10c.

  The input / output unit 12 transmits the generated data signal to the microcomputer 10 via the connection line 11. The input / output unit 12 is, for example, a sensor unit, and measures physical quantities (for example, flow rate, water level, pressure, temperature, etc.) and transmits an electrical signal corresponding to the measurement result.

Conventional electronic devices mainly perform the following operations.
The input / output means 12 (for example, sensor means) transmits an electrical signal (sensor data, measurement data, etc.) corresponding to the measurement result to the interface means 10c via the connection line 11.

  When receiving the measurement data, the interface unit 10c transmits (outputs) an interrupt signal to the arithmetic control unit 10a via the connection line 10f.

  When receiving the interrupt signal, the arithmetic control unit 10a reads the status information from the status register in the interface unit 10c and analyzes the interrupt factor, and based on the analysis result, the following processing (1) or (2) is performed. Execute.

(1) Data transfer processing When the interrupt factor is a data transfer request, the arithmetic control means 10a outputs a data transfer start signal to the data transfer permission signal generating means 10d.
When receiving the data transfer start signal, the data transfer permission signal generating unit 10d outputs the data transfer permission signal to the DMA control unit 10e.
When receiving the data transfer permission signal, the DMA control unit 10e performs sensor data transfer control between the interface unit 10c and the memory 10b via the bus 10f.

(2) Error processing When the interrupt factor is an error, the arithmetic control unit 10a performs predetermined error processing.

  As described above, in the conventional electronic device, the DMA control means performs DMA transfer control for data transfer between the interface means of the data received from the input / output means and the memory based on the data transfer permission signal from the data transfer permission signal generating means. Since the activation control of the DMA control means by the arithmetic control means is performed without going through the bus, it is effective in that the activation of the DMA control means can be made efficient.

By the way, in the interface means 10c, a commercially available chip or a circuit IP (Intellectual Property) is often used as a communication interface circuit, and those that generate “error processing request interrupt” and “data transfer request interrupt” individually. is there.
Further, as described above, the interface unit 10c outputs "error processing request interrupt" and "data transfer request interrupt" as the same interrupt, and identifies the interrupt cause by the status register in the interface unit 10c. is there.

  For example, there are the following Patent Documents 1 and 2 as prior art documents related to conventional electronic devices.

JP 2006-119882 A JP 2004-287654 A

However, in the conventional electronic device, since the arithmetic control unit 10a determines the interrupt factor of the interrupt signal from the interface unit 10c (determination of data transfer processing or error processing), the interface unit 10c performs input / output. Each time data (sensor data, etc.) is received from the means 12, an interrupt is generated for the arithmetic control means 10a, which increases the load on the arithmetic control means 10a for interrupt processing. .

  Specifically, most of the interrupt factors output from the interface unit 10c are data transfer requests for activating the DMA control unit 10e. Since the interrupt processing is executed by the arithmetic control unit 10a, the system performance is improved. There was a problem of lowering.

  The present invention solves such problems, and an object of the present invention is to realize an electronic device that enables data transfer by reducing the number of interruptions to the arithmetic control means and reducing the load on the arithmetic control means. It is in.

In order to achieve the above object, the invention described in claim 1 of the present invention is:
In an electronic device comprising DMA control means for performing DMA transfer control for data transfer between memories of data received by the interface means, and arithmetic control means for executing a predetermined process based on the data,
The interface means includes
When the data is received, an event notification signal is transmitted,
When this event notification signal is received, the event status of the interface means is read out, and it is determined whether the event occurrence factor is a data transfer request or an error processing request. If it is a data transfer request, the data transfer request signal is sent to the DMA An electronic device comprising: event notification means for transmitting to the control means, and in the case of an error processing request, an error processing request signal is transmitted to the arithmetic control means.

The invention according to claim 2 is the electronic device according to claim 1,
The event notification means includes
Interface register access means for reading the event status of the interface means, and generating and sending event cause data indicating that the event cause is a data transfer request or an error processing request;
When the received event factor data indicates a data transfer request, a data transfer request signal is transmitted to the DMA control unit, and when the event factor data indicates an error processing request, an error processing request signal is transmitted to the arithmetic control unit. And an event notification selection means.

The invention according to claim 3 is the electronic device according to claim 1 or 2,
The DMA control means includes:
When the data transfer request signal is received, DMA transfer control of data transfer between the interface means and the memory is executed,
The arithmetic control means includes
When the error processing request signal is received, error processing is executed for the interface means.

The invention according to claim 4 is the electronic device according to claim 2 or 3,
The interface register access means includes
Based on the event status, the event status register in the interface means is written.

Invention of Claim 5 is an electronic device in any one of Claims 2-4,
The event notification selection unit selects generation of the data transfer request signal or the error processing request signal based on the event factor data and a predetermined set value acquired from the calculation control unit. .

The invention according to claim 6 is the electronic device according to any one of claims 1 to 5,
The arithmetic control means includes a tick timer means for transmitting a timer interrupt signal at a predetermined cycle, and the arithmetic control means transfers the memory from the interface means to the memory within the period immediately before the received timer interrupt signal. In accordance with the data, a predetermined process is performed by a predetermined calculation method.

The invention according to claim 7 is the electronic device according to any one of claims 1 to 6,
When the DMA control means detects the end of the DMA transfer process, the DMA control means transmits a DMA process end notification signal to the calculation control means. When the calculation control means receives the DMA process end communication signal, the DMA control means receives a predetermined value based on the data. A predetermined process is performed by the calculation method.

The invention according to claim 8 is the electronic device according to any one of claims 1 to 7,
When the end of the DMA transfer processing of data according to a predetermined protocol is detected from the DMA control unit, the DMA control unit includes a data transfer end detection unit that transmits a data transfer end notification signal, and the arithmetic control unit includes the data transfer end When the notification signal is received, predetermined processing is performed by a predetermined calculation method based on the data.

  According to the present invention, when the interface means receives the data, it transmits an event notification signal. When the interface means receives the event notification signal, it reads the event status of the interface means, and determines whether the event occurrence factor is a data transfer request or an error processing request. An event notification unit that determines whether there is a data transfer request and transmits a data transfer request signal to the DMA control unit, and if it is an error processing request, transmits an error processing request signal to the arithmetic control unit. As a result, it is possible to reduce the number of interruptions to the arithmetic control means and to perform data transfer with a reduced load on the arithmetic control means.

  In other words, the electronic device of the present invention is configured as described above, so that when the event occurrence factor of the event notification signal from the interface means is a data transfer request, an interrupt (and interrupt processing) is issued to the arithmetic control means. Data transfer of the DMA control means can be started without generating or reducing the number of occurrences, and the load on the arithmetic control means due to data transfer between the interface means and the memory (between I / O and memory) can be reduced. Effective in terms.

  According to the sixth aspect, the tick timer means for transmitting the timer interrupt signal at a predetermined cycle is provided in the arithmetic control means, and the arithmetic control means transfers the data from the interface means to the memory within the period immediately before the received timer interrupt signal. By processing the collected data (measurement data) transferred within a certain period by processing the data based on the transferred data, the occurrence of frequent interruptions to the calculation control means is further reduced. This is effective in that the load on the arithmetic control means can be reduced.

  According to the seventh aspect, when the DMA control means detects the end of the DMA transfer process, the DMA control means transmits a DMA process end notification signal to the arithmetic control means, and when the arithmetic control means receives the DMA process end communication signal, the DMA control means By performing processing by a predetermined calculation method, it is possible to detect the end of sensor data transfer for each DMA transfer from the interface means to the memory and to start data (measurement data) processing for the memory. This is effective in that the process can be made more efficient.

  According to claim 8, when the end of DMA transfer processing of data in accordance with a predetermined protocol composed of one or a plurality of data is detected from the DMA control means, data transfer end detection means for transmitting a data transfer end notification signal The calculation control means, when receiving the data transfer end notification signal, processes the collected data (measurement data) by performing processing by a predetermined calculation method based on the data, thereby processing the calculation control means. Increase efficiency.

1 is a configuration explanatory view showing an embodiment of an electronic apparatus of the present invention. It is a structure explanatory view of other examples of electronic equipment of the present invention. It is composition explanatory drawing which shows an example of the conventional electronic device.

<First embodiment>
Hereinafter, the present invention will be described in detail with reference to the drawings. FIG. 1 is an explanatory diagram showing a configuration of an embodiment of an electronic apparatus according to the present invention, and description of portions common to FIG. 3 is omitted as appropriate.

  The difference between FIG. 1 and FIG. 3 is that when the interface means receives data, an event notification signal is transmitted, and when the event notification means receives the event notification signal, the event status of the interface means is read, and the event occurrence factor is a data transfer request. Or if it is a data transfer request, a data transfer request signal is transmitted to the DMA control means, and if it is an error processing request, an error processing request signal is transmitted to the arithmetic control means. is there.

(Configuration overview)
In FIG. 1, an electronic device 2 is a microcomputer 20 that controls the entire electronic device 2 to perform operations peculiar to the device, and an input / output such as a sensor means that transmits and receives signals to and from the electronic device 2 via a connection line 21. Means (input / output device) 22.

  The microcomputer 20 and the input / output means 22 are electrically connected via a connection line 21 such as a bus and an interface means (described later) in the microcomputer 20.

  The microcomputer 20 includes an arithmetic control unit 20a such as a CPU (Central Processing Unit), a memory 20b such as a RAM (Random Access Memory) that is an example of a storage unit, and an interface unit 20c that transmits and receives data to and from the input / output unit 22. Event notification means 20d and DMA control means 20e.

  The arithmetic control unit 20a, the memory 20b, the interface unit 20c, the event notification unit 20d, and the DMA control unit 20e are connected to each other via a bus 20f that is an example of a connection line.

  The arithmetic control unit 20a is connected to the event notification unit 20d via the connection line 20g. The event notification unit 20d is connected to the DMA control unit 20e via the connection line 20h.

(Description of main components)
The memory 20b mainly stores various information such as programs and applications for operating as the electronic device 2 (for example, field devices) and data used when executing these programs.

When receiving data from the input / output means 22 via the connection line 21, the interface means 20c generates an “event notification signal” and transmits it to the event notification means 20d via the bus 20f. The interface unit 20c includes an event status register that stores therein data indicating an error status and a data transfer request status.
Further, the interface unit 20c performs data transmission / reception with the memory 20b based on a control signal from the DMA control unit 20e.

  When the event notification unit 20d receives the event notification signal, the event notification unit 20d reads and analyzes the event status from the event status register in the interface unit 20c via the bus 20f and the connection line 21, and analyzes whether the event occurrence factor is a data transfer request. Determine if it is a request. The event notification unit 20d transmits a “data transfer request signal” to the DMA control unit 20e when the request is a data transfer request, and transmits an “error processing request signal” to the arithmetic control unit 20a when the request is an error processing request.

More specifically, the event notification unit 20d reads the event status of the interface unit, and generates and transmits event factor data indicating that the event generation factor is a data transfer request or an error processing request, and transmits the interface factor access unit 30a. When the received event factor data indicates a data transfer request, a data transfer request signal is transmitted to the DMA control unit 20e, and when the event factor data indicates an error processing request, an error processing request signal is transmitted to the arithmetic control unit 20a. Event notification selection means 30b.
The interface register access unit 30a and the event notification selection unit 30b are electrically connected.

  The arithmetic control unit 20a reads the program from the memory 20b, activates the system of the electronic device 2, and controls the interface unit 20c, the event notification unit 20d, and the DMA control unit 20e to control the entire electronic device 2.

  The arithmetic control unit 20a executes a predetermined process based on the data stored in the memory 20b. Further, upon receiving the “error processing request signal”, the arithmetic control means 20a performs a predetermined process corresponding to the error.

  When receiving the data transfer permission signal, the DMA control means 20e performs DMA (Direct Memory Access) transfer control for data transfer between the interface means 20c and the memory of various data including the data received by the interface means 20c.

  The input / output unit 22 transmits the generated data signal to the microcomputer 20 via the connection line 21. The input / output means 22 is, for example, a sensor means or the like, and measures physical quantities (for example, flow rate, water level, pressure, temperature, etc.) and transmits an electrical signal corresponding to the measurement result.

(Description of operation)
With such a configuration, the electronic apparatus according to the present invention mainly performs the following operations.
The input / output means 22 (for example, sensor means) transmits an electrical signal (sensor data, measurement data) corresponding to the measurement result to the interface means 20c via the connection line 21.

  When receiving the measurement data, the interface unit 20c transmits (outputs) an event notification signal to the event notification unit 20d via the bus 20f.

When receiving the event notification signal, the interface register access unit 30a of the event notification unit 20d reads the status information from the status register in the interface unit 20c, analyzes the event generation factor, and transmits event generation factor data.
Based on this analysis result, the electronic device of the present invention executes either of the following processes (1) and (2).

(1) Data transfer processing When the event occurrence factor is a data transfer request, the interface register access unit 30a generates event factor data indicating that the event occurrence factor is a data transfer request, and sends it to the event notification selection unit 30b. Send.

  Upon receiving the event factor data, the event notification selection unit 30b transmits a data transfer request signal to the DMA control unit 20e when the received event factor data indicates a data transfer request.

  When receiving the data transfer request signal, the DMA control unit 20e performs transfer control of measurement data between the interface unit 20c and the memory 20b via the bus 20f.

(2) Error processing When the event occurrence factor is an error occurrence, the interface register access unit 30a generates event factor data indicating that the event occurrence factor is an error processing request, and transmits the event factor data to the event notification selection unit 30b. .

  Upon receiving the event factor data, the event notification selection unit 30b transmits an error processing request signal to the arithmetic control unit 20a when the received event factor data indicates an error processing request.

  When receiving the error processing request signal, the arithmetic control unit 20a performs a predetermined process corresponding to the error.

  As a result, the electronic device according to the present invention transmits an event notification signal when the interface means receives data, reads the event status of the interface means when receiving the event notification signal, and determines whether the event occurrence factor is a data transfer request. Event notification means for determining whether it is an error processing request and transmitting a data transfer request signal to the DMA control means if it is a data transfer request, and transmitting an error processing request signal to the arithmetic control means if it is an error processing request , The number of interruptions to the arithmetic control means can be reduced, and data transfer with a reduced load on the arithmetic control means becomes possible.

  In other words, the electronic device of the present invention is configured as described above, so that when the event occurrence factor of the event notification signal from the interface means is a data transfer request, an interrupt (and interrupt processing) is issued to the arithmetic control means. Data transfer of the DMA control means can be started without generating or reducing the number of occurrences, and the load on the arithmetic control means due to data transfer between the interface means and the memory (between I / O and memory) can be reduced. Effective in terms.

  The electronic device of the present invention may be a field device that transmits a physical quantity calculated by a predetermined calculation method based on measurement data. In this case, the input / output unit 22 is, for example, a sensor unit that measures a physical quantity, measures a physical quantity (flow rate, water level, pressure, temperature, etc.), and outputs an electrical signal (measurement data) according to the measurement result to the interface unit 20c. Send to.

<Other examples>
The electronic device of the present invention is not limited to the configuration of the first embodiment, and may have the following configuration. This will be described below with reference to FIG. FIG. 2 is a diagram illustrating the configuration of another embodiment of the electronic apparatus according to the present invention. The following embodiments (other embodiments A to E) will be described. In FIG. 2, parts common to FIG. 1 are denoted by the same reference numerals, and description thereof will be omitted as appropriate.

(Other Example A)
In addition to the configuration of the above-described embodiment, the electronic device of the present invention generates event factor data and transmits it to the event notification selection unit 30b when the interface register access unit 30a receives the event notification signal. Although described, in addition to this, it is possible to write to the event status register in the interface means 20c, or to clear the value in the register.

  Specifically, the interface register access unit 30a may write a value to a register in the interface unit 20c via the bus 20f according to an event status in the interface unit 20c read out via the bus 20f.

The interface register access means 30a acquires the value generated by the arithmetic control means 20a via the bus 20f and writes the value to the event status register in the interface means 20c via the bus 20f. But you can.
At this time, the arithmetic control unit 20a generates a value to be written to the event status register (a value for clearing) by a predetermined arithmetic process as a value corresponding to the register specification of the interface unit 20c.

Further, the interface register access means 30a may be capable of selecting whether or not to write a value to the event status register in the interface means 20c via the bus 20f.
Specifically, the interface register access unit 30a selects whether or not to write to the register based on the event status in the interface unit 20c read out via the bus 20f and the set value via the bus 20f from the arithmetic control unit 20a. It may be a thing.

(Other Example B)
In addition to the configuration of the above-described embodiment, the electronic device according to the present invention may be configured so that the event notification selection unit 30b sends a data transfer request signal to the DMA control unit 20e when the received event factor data is a data transfer request. However, in the case where the received event factor data is an error processing request, it is described that the error processing request signal is output to the arithmetic control means 20a. The generation of the data transfer request signal or the error processing request signal may be selected based on a predetermined set value acquired from the control unit 20a.

  At this time, the setting value generated by the arithmetic control unit 20a indicates the bit position where the error status data is stored or the bit position where the DMA transfer is stored in the event factor data.

(Other Example C)
In addition to the configuration of the above-described embodiment, the electronic device of the present invention includes a tick timer means 20i that transmits a timer interrupt signal at a predetermined cycle to the arithmetic control means 20a connected via the bus 20f. The calculation control means 20a performs processing by a predetermined calculation method based on the data (measurement data) transferred from the interface means 20c to the memory 20b within a certain period immediately before the received timer interrupt signal (predetermined calculation method). (Physical quantity calculation process).

  As a result, the electronic apparatus according to the present invention includes the above-described tick timer means, and further processes frequent data (measurement data) transferred within a certain period, thereby further causing frequent interruptions to the arithmetic control means. This can reduce the load on the arithmetic control means.

(Other Example D)
In addition to the configuration of the above-described embodiment, the electronic device according to the present invention transmits a DMA processing end notification signal to the arithmetic control unit 20a when the DMA control unit 20e detects the end of processing of one data DMA transfer. When the DMA control end communication signal is received, the calculation control means 20a may perform processing by a predetermined calculation method based on the data (measurement data) (perform physical quantity calculation processing by the predetermined calculation method).

  As a result, the electronic apparatus according to the present invention can detect the end of sensor data transfer in one DMA transfer from the interface unit 20c to the memory 20b by adopting such a configuration. Data) processing can be started, which is effective in that the processing of the arithmetic control means 20a can be made efficient.

(Other Example E)
Further, in addition to the configuration of the above-described embodiment, the electronic device of the present invention detects the end of the DMA transfer processing of data according to a predetermined protocol including one or a plurality of data from the DMA control unit 20e. A data transfer end detection unit 20j for transmitting a data transfer end notification signal is provided. Upon receiving the data transfer end notification signal, the calculation control unit 20a performs processing by a predetermined calculation method based on the data (measurement data) (predetermined The physical quantity calculation process may be performed by a calculation method).
The DMA control means 20e has data information in accordance with a protocol such as a predetermined number of data transfers, and based on the information such as the number of data transfers, a predetermined number of data is determined. Detects completion of data transfer according to the protocol.

As a result, the electronic apparatus according to the present invention is configured to include the data transfer end detection unit 20j as described above, thereby processing the collected data (measurement data), thereby efficiently processing the arithmetic control unit 20a. This is effective in that
(Appendix 9)
Interface means for receiving measurement data from the sensor means and transmitting / receiving data to / from the memory, DMA control means for performing DMA transfer control of the measurement data between the memory and the interface means, and predetermined based on the measurement data In an electronic device that is a field device that transmits a physical quantity calculated by a predetermined calculation method based on the measurement data,
The interface means transmits an event notification signal when receiving the measurement data,
When the event notification signal is received, the event status of the interface means is read, and it is determined whether the cause of the event is a data transfer request or an error processing request, and if it is a data transfer request, the data transfer request signal is sent to the DMA 9. An electronic device according to claim 1, further comprising an event notification unit that transmits to the control unit and, in the case of an error processing request, transmits an error processing request signal to the arithmetic control unit. .
(Appendix 10)
The calculation control means performs a physical quantity calculation process on the measurement data transferred from the interface means to the memory within the period immediately before the received timer interrupt signal by a predetermined calculation method. Item 10. The electronic device according to any one of Items 1 to 9.
(Appendix 11)
11. The electronic apparatus according to claim 1, wherein when the DMA control end communication signal is received, the arithmetic control unit performs a physical quantity calculation process using a predetermined calculation method based on the measurement data. .
(Appendix 12)
A data transfer end detection means for transmitting a data transfer end notification signal when the DMA control means detects the end of DMA transfer processing of data in accordance with a predetermined protocol including one or a plurality of measurement data; 8. The electronic apparatus according to claim 1, wherein when receiving the data transfer end notification signal, the control unit performs a physical quantity calculation process by a predetermined calculation method based on the data.

2 Electronic equipment 20 Microcomputer 20a Operation control means 20b Memory 20c Interface means 20d Event notification means 30a Interface register access means 30b Event notification selection means 20e DMA control means 20f Bus 20g, 20h Connection line 20i Tick timer means 20j Data transfer end detection means 21 Connection 22 Input / output means

Claims (8)

In an electronic device comprising DMA control means for performing DMA transfer control for data transfer between memories of data received by the interface means, and arithmetic control means for executing a predetermined process based on the data,
The interface means transmits an event notification signal upon receiving the data,
When this event notification signal is received, the event status of the interface means is read out, and it is determined whether the event occurrence factor is a data transfer request or an error processing request. If it is a data transfer request, the data transfer request signal is sent to the DMA An electronic device comprising: event notification means for transmitting to the control means, and in the case of an error processing request, an error processing request signal is transmitted to the arithmetic control means. The event notification means includes
Interface register access means for reading the event status of the interface means, and generating and sending event cause data indicating that the event cause is a data transfer request or an error processing request;
When the received event factor data indicates a data transfer request, a data transfer request signal is transmitted to the DMA control unit, and when the event factor data indicates an error processing request, an error processing request signal is transmitted to the arithmetic control unit. The electronic device according to claim 1, further comprising an event notification selection unit that performs the operation. The DMA control means includes:
When the data transfer request signal is received, DMA transfer control of data transfer between the interface means and the memory is executed,
The arithmetic control means includes
3. The electronic apparatus according to claim 1, wherein when the error processing request signal is received, error processing is executed on the interface unit. The interface register access means includes
4. The electronic apparatus according to claim 2, wherein writing is performed in an event status register in the interface unit based on the event status. The event notification selection means includes:
5. The generation of the data transfer request signal or the error processing request signal is selected based on the event factor data and a predetermined set value acquired from the arithmetic control unit. The electronic device according to Crab. Tick timer means for transmitting a timer interrupt signal at a predetermined cycle to the arithmetic control means,
The calculation control means performs a predetermined process by a predetermined calculation method based on the data transferred from the interface means to the memory within the period immediately before the received timer interrupt signal. The electronic device in any one of Claims 1-5. When the DMA control means detects the end of the DMA transfer process, it sends a DMA process end notification signal to the arithmetic control means,
The electronic apparatus according to claim 1, wherein the arithmetic control unit performs a predetermined process by a predetermined arithmetic method based on the data when the DMA processing end communication signal is received. .   When the end of the DMA transfer processing of data according to a predetermined protocol is detected from the DMA control unit, the DMA control unit includes a data transfer end detection unit that transmits a data transfer end notification signal, and the arithmetic control unit includes the data transfer end 8. The electronic apparatus according to claim 1, wherein when the notification signal is received, a predetermined process is performed by a predetermined calculation method based on the data.

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