JPH0227692B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a self-recovery method for microprogram runaway in a microprogram control processing device.

(Prior Art) Conventionally, in a microprogram control processing device that has multiple main programs for realizing multiple functions, for some reason the main program that should be executed jumps to another main program and cannot be returned to the original one. If a runaway occurs, it is necessary to monitor the microprogram with another monitoring device, detect the microprogram runaway, and reset the microprogram, which leads to hardware redundancy and does not self-recover. Therefore, there was a drawback that a failure state occurred to the outside and processing stopped.

(Object of the Invention) An object of the present invention is to provide a self-recovery method for a microprogram-controlled processing device that solves such conventional drawbacks.

(Summary of the Invention) The self-recovery method of the microprogram control processing device of the present invention uses control data written through a data input section to select a main program to be executed from among a plurality of main programs at the time of initial setting. writing to the data retention RAM, periodically reading control data from the data retention RAM for each main program, and setting various parameters for executing the main program indicated by the read control data;
It is characterized in that the process of activating the program indicated by the control data is performed periodically.

(Embodiment) FIG. 1 is a block diagram showing an embodiment of the present invention, in which a program counter 11, a program storage ROM 12, a data storage ROM 13, a data retention RAM 14, an arithmetic processing section 15, an internal bus 1
6, a bidirectional bus interface 17, and a bidirectional bus terminal 18.

The program storage ROM 12 stores a plurality of main programs and initial setting programs for realizing a plurality of functions or characteristics.

The operation will be explained in conjunction with the flowchart in FIG. 2. First, the initial setting section 21 controls the program counter 11 to be in a stopped state until control data is written from the bidirectional bus terminal 18. The initial setting section 20 initializes flags, registers, memory, etc., and the control data is written into the data holding RAM 14 via the bidirectional bus interface 17. Next, the control data initial determination unit 21 determines which of two different processes the control data written in the data holding RAM 14 is for, and selects and executes either the parameter initial setting unit 22 or 32. The parameter initial setting section 22 includes a main processing section 23 and a parameter initial setting section 3.
2 sets various parameters necessary for executing the main processing section 33. Control data initial determination unit 2
According to the determination result in step 1, the main processing unit 23 or 3
3, and performs processing to realize one of the types of functions that the processing device has. Next, the initial setting section 20 reads out the control data held in the data holding RAM 14 by the control data reading section 24 or 34, and the control data discriminating section 25 or 35 discriminates the read control data. According to the determination result, the jump destination is specified in the parameter setting unit 26 or 36. The parameter setting units 26 and 36 perform parameter settings excluding parameters with the same value in the parameter initial setting units 22 and 32, and the parameter setting unit 26 sets parameters for the main processing unit 23, and the parameter setting unit 36 sets parameters for the main processing unit 23. The parameters of the section 33 are set respectively.
When the parameter setting section 26 or 36 is executed, the process moves to the main processing section 23 or 33 and continues processing for realizing the function. For these processes, the data storage ROM 13, data retention RAM 14, and arithmetic processing section 15 are used as appropriate.

Here, if for some reason the microprogram runs out of control to a main processing section other than the main processing section indicated by the control data, for example, when the control data specifies the main processing section 23, the microprogram is sent to the main processing section 33. The operation of this embodiment in the case where the microprogram goes out of control will be described below. The main processing section 33 runs out of control, and the main processing section 33 is executed.Next, the control data reading section 34 reads out the control data from the data holding RAM 14, and then the control data discriminating section 35 discriminates the control data. Since the control data specifies the main processing section 23, the parameter setting section 26
The destination is specified. Parameter setting section 26
Then, the main processing section 23 sets parameters, returns to the main processing section 23, performs the original processing specified by the control data, and can self-recover from runaway to other main processing sections 33.

In the above embodiment, the case where there are two main programs has been described as an example, but the number is not limited to this number.

(Effects of the Invention) As explained above, the present invention provides control data for selecting a main program to be executed from among a plurality of main programs written through a data input circuit at the time of initial setting. write to,
For holding data periodically in each of the main programs
By reading control data from RAM, cyclically performing the process of setting various parameters for executing the program indicated by the read control data, and the process of starting the program indicated by the control data, multiple main programs can be executed. If a runaway occurs in which the main program that should be executed jumps to another main program and cannot be returned to the original state, it is efficient to restore to the main program that was originally supposed to be executed without having to reset from an external source. This has the effect of realizing a highly reliable self-recovery method.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing one embodiment, and FIG. 2 is a flow chart of the implementation. 11: Program counter, 12: ROM for program storage, 13: ROM for data storage, 1
4: RAM for data retention, 15: Arithmetic processing unit, 1
6: Internal bus, 17: Bidirectional bus interface, 18: Bidirectional bus terminal.

Claims (1)

[Claims] 1 A program storage ROM that stores multiple main programs and initial setting programs to realize multiple functions or characteristics, a data input section that takes in data from the outside, and a data storage that stores data from this data input section. The initial setting program is executed when a reset signal is input, and the control data for selecting the plurality of main programs written through the data input section is stored in the data holding RAM. means for writing, and means for determining the control data, selecting one of the plurality of main programs, setting various parameters for executing the selected main program, and activating the selected main program. Then, the selected and started main programs are periodically executed in each of the plurality of main programs in a microprogram processing device equipped with means for realizing a certain function or characteristic until the reset signal is input again. reads the control data from the data holding RAM,
Periodically perform processing to determine the read value, select one of the plurality of main programs, set various parameters for executing the selected main program, and start the selected main program. A self-recovery method for a microprogram-controlled processing device characterized by: