JPH0329067A - Microcomputer - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention is applicable to peripherals such as timer circuits and serial transfer circuits that start an operation according to data set from a central processing unit and repeat this operation a predetermined number of times. Concerning microcomputers equipped with circuits. [Prior Art] Fig. 3 is a block diagram showing the configuration of a conventional microcomputer, in which 1 is a central processing unit (hereinafter referred to as CPU).
). The CPUI is connected via an address bus 4 and a data bus 5 to peripheral circuits 2, each independent of the CPU, and provides data to the associated registers 23 and start flags 24 of the peripheral circuits 2. Next, CPU or peripherals? The operation for controlling the repetitive operation of 82 will be explained. After the CPUI sets a value that determines the operating mode of the peripheral circuit 2 in its associated register 23, the peripheral circuit 2 starts operating by setting a start flag 24. If the set operating mode of the peripheral circuit 2 is an operating mode that repeats a series of operations, the CPU
I monitors the number of repetitions of the peripheral circuit 2, and when the number of repetitions reaches a predetermined number, clears the start flag 24 and stops the operation of the peripheral circuit. [Problems to be Solved by the Invention] Since conventional microcomputers are configured as described above, the CPU monitors the repetitive operations of the peripheral circuits in order to count the same number of repetitions of the peripheral circuits and determine the end time. During this time, the CPU is occupied and other calculations and data processing cannot be performed, resulting in a problem of low data processing efficiency.

The present invention has been made to solve this problem, and after the peripheral circuit starts operating, the number of repetitions of the peripheral circuit's operation is counted independently from the control of the central processing unit, and the number of repetitions of the peripheral circuit is counted independently from the control of the central processing unit. By providing a means to stop the operation of the peripheral circuits independently from the control of the central processing unit when the number reaches a predetermined number, the load on the central processing unit on the peripheral circuits can be reduced and more calculations and data can be processed. The purpose is to provide a microcomputer that can perform processing. [Means for Solving the Problems] The microcomputer of the present invention utilizes a signal output from the peripheral circuit each time the repetitive operation is completed after the central processing unit sets data for starting the operation of the peripheral circuit. and a means for counting the number of repetitions of the operation of the peripheral circuit independently from the control of the central processing unit, and a means for outputting a signal to the peripheral control circuit when the counted number of times reaches a predetermined number, and controlling the central processing unit. The present invention is characterized by comprising means for stopping the repetitive operation of the peripheral circuit independently of the control.

[Effect]

In the microcomputer of the present invention, after the central processing unit sets operation start data for the peripheral circuit and the peripheral circuit starts operating, the peripheral circuit performs one operation independently from the control of the central processing unit. The signal output each time is counted, and when the needle value reaches a predetermined number of times, a signal is output to the peripheral circuit, and the repetitive operation of the peripheral circuit is stopped independently of the control of the central processing unit.

〔Example〕

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in detail below based on drawings showing embodiments thereof.

FIG. 1 is a block diagram showing the structure of a microcomputer according to the present invention, in which l is a CPU.
I connect a timer circuit, a serial transfer circuit, . It is connected to the peripheral circuit 2 such as an analog/digital (A/D) conversion circuit and the peripheral control counter 3, and provides data to the related register 23 and start flag 24 of the peripheral circuit 2 and the count register 31 of the peripheral control counter 3. The peripheral circuit 2 generates an interrupt signal every time the same operation is completed,
This interrupt number fB is output to the peripheral control counter 3 via the signal line 6. The peripheral control counter 3 outputs the control fB number to the start flag 24 of the peripheral circuit 2 via the signal line 7. The procedure for controlling the repetitive operations of peripheral circuits by the microprocessor of the f1 precept as described above will be explained. The CPU sets the operation mode of the peripheral circuit 2, the values of each selection flag, etc. in the related register 23, and also sets the number of repetitions n of the operation in the count register 3l of the peripheral control counter 3. Next, when the CPU 1 sets the start flag 24, the peripheral operation 2 starts operating.

The peripheral circuit 2 issues an interrupt request each time a series of operations, such as one overflow in the evening/time circuit, one data transfer in the serial transfer circuit, one A/D conversion in the A/D conversion circuit, etc. When a pulse signal is generated and this interrupt signal is output to the peripheral control counter 3 via the signal line 6, the peripheral control counter 3 counts the given interrupt signal, and when the count reaches a predetermined number n that was initially set, , control m(δ) is connected to the peripheral circuit 2 via the signal line 7.
and clears the start flag 24. Start flag 2
The peripheral circuit 2 with 4 cleared ends its operation.

Therefore, after the CPUI initializes the peripheral circuit 2,
While the peripheral circuit 2 is performing repetitive operations, other calculations and data processing are performed. Further, FIG. 2 shows a plurality of peripheral same vPf2. 2.・・・
1 is a block diagram showing the main structure of a microcomputer that controls . In the drawings, the same reference numerals indicate the same or corresponding parts as in the above-described embodiment, and the explanation thereof will be omitted. three peripheral circuits 2a,
2b, 2c are fB lines 6, 6 . . . which transmit interrupt signals.
6 is connected to the peripheral control counter 3 through a relay l1 consisting of three movable contacts and one fixed contact connected to each
connected to. Further, the peripheral control counter 3 is connected to the peripheral circuit via a relay 12 consisting of three movable contacts connected to each and three fixed contacts connected to the start flags 24a, 24b, and 24c, respectively. Connected to 2a, 2b, and 2c.

Next, we will outline the control procedure for repetitive operations of peripheral circuits in a microcomputer configured as above. For example, when the peripheral circuit 2a performs the anti-fjF operation, the peripheral circuit 2a is connected to the peripheral control counter 3 by the relay 1), and each time the peripheral circuit 2a completes the anti-fjF operation, it is output via the signal line 6. Count interrupt signals. When the peripheral circuit 2a completes a predetermined number of repetitive operations,
A control signal is applied via the signal line 7 from the peripheral control counter 3 connected to the peripheral circuit 2a by the relay 12, and when the start flag 24a is cleared, the peripheral circuit 2 ends its operation. Furthermore, when the peripheral control count 3 and either or both of the other peripheral circuits 2b and 2c are connected by the relay 12, when the start flag 24a of the peripheral circuit 2a is cleared, the control signal causes the other peripheral circuit 2b to be connected. ,2c
If either or both of the start flags 24b and 24c of {t
It is possible to terminate the operation of either or both of the peripheral circuits 2b and 2e. In this embodiment, the peripheral control counter 3 is newly provided, but the same effect can be obtained even if an existing timer is used as the peripheral control counter 3. Furthermore, in this embodiment, an interrupt signal is output every time the repetitive operation of the peripheral circuit 2 is completed, and this interrupt signal is counted. However, the count source for the repetitive operation is not limited to the interrupt signal; A similar effect can be obtained with signals.

(Effects of the Invention) In the microcomputer of the present invention, after the CPU performs initial settings for the peripheral circuits, there is no need to monitor the repetitive operations of the peripheral circuits, and the peripheral circuits perform repetitive operations. This has the excellent effect of improving data processing efficiency by allowing other calculations and data processing to be performed in the meantime.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing the structure of a microcomputer according to the present invention, and the second FI! J is a block diagram showing the structure of another embodiment of the microcomputer according to the present invention, and FIG. 3 is a block diagram showing the structure of a conventional microcomputer. l...CPU2...Peripheral circuit 3...Peripheral control counter 4...Address bus 5...Data path 6
...Signal line 7...Signal line 1). 12...Relay 23...Related resistor 24...Start flag In the figures, the same reference numerals indicate the same or corresponding parts. Funeral map

Claims (1)

[Claims] (1) In a microcomputer equipped with a peripheral circuit that starts an operation according to data set from the central processing unit and repeats the operation a predetermined number of times, data for starting the operation of the peripheral circuit is set from the central processing unit. a means for counting the number of repetitions of the operation of the peripheral circuit independently from the control of the central processing unit; A microcomputer comprising means for stopping repetitive operations.