JPS61182590A - Timer counter system - Google Patents

Abstract

PURPOSE:To attain fine time specification by dividing a time specification field into a counting pulse specification and a counting value during the period of a timer setting instruction, and sending respective signals to a counter through a pulse selecting circuit and a counting value inverting gate respectively. CONSTITUTION:When an interruption is to be generated within a time specified on a microprogram, a pulse is selected from a specified time value, a counting value is determined from the unit time of the pulse and the time specification field of a timer setting instruction 1 is set up. One pulse of plural ones is selected on the basis of the counting pulse specification and sent to the counter through the pulse selecting circuit 22 and the counting value inverting gate 21. When the contents of the counter 23 overflow, a timer counter interrupting mechanism 4 generates a timer counter interruption to the microprogram. Consequently, the specification time can be detected.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a timer counter set by a microprogram instruction.

[Conventional technology]

Conventionally, there has been a system of this type as shown in FIG. In the figure, (υ is a timer set instruction on a microprogram that has a field that specifies one counter from a group of counters provided for each time, and (2) is a timer set instruction that selects a counter by the counter specification of timer set instruction (1). circuit, (31 is a counter selection circuit 1 provided for each time
A counter group in which only the counter specified by 2+ counts, and (4) is a timer counter consisting of a mechanism that detects that the output of the specified counter in counter group (3) has overflowed and issues a timer counter interrupt to the microprogram. It is a method.

Next, the operation will be explained. When generating an interrupt at a time specified in the microprogram 2. Specify one counter in the group of counters that generates an interrupt with the closest expected value in the counter specification field of the timer set instruction (1). Counter selection circuit +21 Selects the counter specified in the rt counter specification field from among the counters. 0 The selected counter starts counting and sends the output to the timer counter interrupt mechanism (4). When the counter output from the counter group (3) overflows, the timer counter interrupt mechanism (4) generates a timer counter interrupt sound on the microprogram.

The conventional timer/counter method is configured as described above, but it must have a number of counters for the specified time, and a group of counters is required.

Additionally, new counters are provided for time specifications that are not included in the counter group, which often has drawbacks such as the inability to specify detailed time specifications.

[Summary of the invention]

This invention was made in order to eliminate the drawbacks of the conventional ones as described above, and it divides the time designation field into a count pulse designation and a count value during a timer set command.
This provides a timer/counter method that allows detailed time specification using one counter.

[Embodiment of the Invention] An embodiment of the invention will be described below with reference to the drawings. 1st
In Figure 2, (1) is a timer set instruction on a microprogram that specifies the count pulse of the counter and has a time specification field consisting of the count value. A pulse selection circuit that selects the pulse to be used, @ is a counter that is reset by initial reset and counts by the pulse selected from the inverted count value, (4
) is a mechanism that issues a timer counter interrupt to the microprogram when the output of the counter exceeds 70. I211 is a gate that inverts the count value of the timer set command (1) and sends it to the counter (2).

Next, operation 9 will be explained. When generating an interrupt at a time specified in the microprogram, select a pulse from the specified time value, determine the count value from the unit time of the pulse, and set the time specification field of the timer set command fil. A count pulse is sent from the pulse selection circuit @ which selects one pulse from among the pulses Nf to the counter. Timer set command 1
The count value of 11 is inverted and sent to the counter through the game H1υ.

Counter C! It is reset by 3a initial reset.

A timer counter interrupt mechanism (4) sets the inverted count value sent through 011 and counts each pulse from the pulse selection circuit (2).When the counter output exceeds 70- ) generates a timer counter interrupt to the microprogram to notify it that the specified time has arrived.

Incidentally, in the above embodiment, an inversion gate Qυ for the count value is provided, but the inversion gate Qυ may be deleted and the counter (to) may be replaced by a subtraction counter.

In the above embodiment, a timer counter interrupt is generated, but various trigger signals may be used, and the same effects as in the above embodiment can be achieved.

〔Effect of the invention〕

As described above, according to the present invention, the input pulse of the timer counter is selected and counting is performed from the count value, so there is no need to provide multiple counters, the device can be made inexpensive, and detailed time specifications can be made. The effect of getting something is 0

[Brief explanation of the drawing]

FIG. 1 is a diagram showing a timer counter system according to an embodiment of the present invention, and FIG. 2 is a diagram showing a conventional timer counter system. (1) is a timer set command, (21 is a counter selection circuit, 13) is a counter group, (4) is a timer counter interrupt mechanism, Q is a count value inversion gate, g3 is a pulse selection circuit, and @ is a counter. In Figure 9, the same reference numerals indicate the same or similar parts.

Claims (1)

[Claims] A timer set instruction with a count pulse specification and a time specification field for specifying the count value is provided in the microprogram instruction, and a circuit that selects a pulse from a plurality of frequency-based pulse groups according to the count pulse specification in the field, and is reset by initial reset. A timer that is equipped with a counter that counts based on pulses selected from the counted value, and a mechanism that issues a timer counter interrupt to the microprogram when the counter output overflows. Counter method.