JP2503838Y2 - Microprocessor device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to a microprocessor device having a microprocessor as a main constituent element, and more specifically, to obtain a factor for stopping operation of the microprocessor as information. The present invention relates to a microprocessor device.

<Prior Art> In a microprocessor device, the operation stop factor is an internal factor such as an internal failure or a self-stop by a program, and an external factor, for example, a stop switch, or another device in the system. There is a stop signal. When the operation of the microprocessor is stopped, it is important to know what caused the stop when restarting or predicting an abnormal part.

In the conventional device, when the operation of the microprocessor is stopped, the memory contents are dumped out and analyzed, or an analyzer is set and analyzed.

<Problems to be solved by the device> However, in addition to complicated procedures, such a method
There is a problem that requires a special analyzer.

The present invention has been made in view of such problems.
It is an object of the present invention to realize a microprocessor device capable of knowing the cause of the microprocessor operation stop by a simple method.

<Means for Solving the Problems> According to the present invention, which achieves the above-mentioned object, a microprocessor, and a start-stop control circuit that outputs a stop signal to the microprocessor upon receiving one of a plurality of stop request signals, Register means for inputting the plurality of stop request signals and holding these stop request signals, and operation independent of the operation of the microprocessor to read the contents of the register means through an internal bus and transfer the data. And a DMA means for doing so.

<Operation> The register means holds the stop request signal applied to the start / stop control circuit. When the microprocessor receives the stop signal from the start / stop control circuit, its operation is stopped. After the operation is stopped, the DMA means transfers the data related to the stop cause to another device by reading the contents of the register means.

<Embodiment> Hereinafter, an embodiment of the present invention will be described in detail with reference to the drawings.

FIG. 1 is a configuration block diagram showing an embodiment of the present invention. In the figure, 1 is a microprocessor, 2 is a start / stop control circuit, which receives a plurality of stop request signals such as a self-stop signal by a program, a stop signal by a switch, a stop signal from another device, and any one of these stop signals. The stop signal is output to the microprocessor 1 by the signal of.

Reference numeral 3 denotes register means for inputting a plurality of stop request signals provided to the start / stop control circuit 2, and when any of these stop request signals is input, a register means for setting and holding a flag of a bit corresponding to the request signal. It is connected to the internal data bus DB.

4 is a DMA (Direct Memory Access) means,
It operates independently of the operation of the microprocessor 1, reads the contents of the register means 3 via the internal data bus DB,
The data is transferred to another device, for example.

The microprocessor 1 is a main component of this device, and is connected to various memories, I / O devices, and the like via an internal data bus DB (not shown). The microprocessor is stopped by an internal failure but is stopped by a stop signal from the start / stop control circuit 2.

 The operation of the device configured as described above will be described below.

FIG. 2 is a flowchart showing an example of the operation of this device.

During normal operation, the microprocessor 1 exchanges data with other memories and I / O devices via the internal data bus DB to process various jobs.

Now, for example, when the stop switch is driven or it is determined that the operation of the system should be stopped and the operation of the microprocessor 1 should be stopped, some kind of stop request signal is applied to the start / stop control circuit 2. (Step 1).

Upon receiving the stop request signal, the start / stop control circuit 2 outputs a processor stop signal to the microprocessor 1. Further, the register means 3 sets a bit flag according to the type of the input stop signal and stores it (step 2).

Upon receiving the processor stop signal, the microprocessor 1 immediately stops (step 3).

As a result, the work processing by the microprocessor 1 is stopped and various memories and I / O connected to the internal data bus DB are stopped.
Access to O will also be stopped.

After that, when the cause of the stop of the microprocessor 1 is analyzed, another device connected to the DMA means 4 activates the DMA means 4, reads the contents of the register means 3, and sends a microprocessor with any kind of stop request signal. Know if 1 has stopped (step 4).

In addition, as a factor that the microprocessor 1 is stopped,
When there is an internal failure other than the case of a stop request signal from the outside, but none of the flags of the register means 3 are set, it is determined that the stop of the microprocessor 1 is due to the internal failure.

<Effect of the Invention> As described in detail above, according to the present invention, when the microprocessor 1 is stopped due to some cause,
The factor can be easily determined from the contents of the register means 3. Therefore, it is possible to accurately judge whether or not to restart the microprocessor 1 and accurately predict the abnormal portion.

[Brief description of drawings]

FIG. 1 is a configuration block diagram of an embodiment of the present invention, and FIG. 2 is a flow chart showing an example of the operation. 1 ... Microprocessor 2 ... Start / stop control circuit 3 ... Register means 4 ... DMA means DS ... Internal data bus

Claims (1)

(57) [Scope of utility model registration request] 1. A microprocessor, a start / stop control circuit for receiving one of a plurality of stop request signals and outputting a stop signal to the microprocessor, and a plurality of stop request signals for inputting the plurality of stop request signals. A microprocessor device comprising: register means for holding the data; and DMA means for operating independently of the operation of the microprocessor to read the contents of the register means via an internal bus and transfer the data.