Interrupt control method and interrupt control unit

Abstract

The invention provides an interrupt control method and an interrupt control unit. The method comprises the following steps that after an MCU (micro control unit) receives an interrupt request, the MCU reads interrupt source information from an interrupt marker register of a programmable logic device, wherein the interrupt source information is the information recorded in the interrupt marker register according to an external interrupt signal after the programmable logic device receives the external interrupt signal of interrupt source equipment; the MCU generates an interrupt task according to the interrupt source information; and the MCU indicates corresponding execution equipment to execute the interrupt task. By a cooperative work means between the programmable logic device and the MCU, the interrupt control is realized, the expandability of the interrupt control unit is improved, and the resource occupancy on the MCU is reduced.

Description

technical field [0001] The invention relates to an interruption control method and an interruption control unit, belonging to the technical field of interruption control. Background technique [0002] In some electromechanical automatic control devices, the interrupt control unit needs to have the ability to handle multiple interrupt requests, so as to deal with scenarios such as monitoring multiple alarm inputs or multiple communication requests. [0003] In order to achieve this purpose, the solution in the prior art is to directly connect the peripheral as the interrupt source with a Micro Control Unit (MCU for short), and use the processing capability of the MCU itself to implement interrupt control. The disadvantage of this method is that each external interrupt signal from the interrupt source will occupy an input pin of the MCU, and at the same time, the MCU needs to allocate corresponding interrupt processing resources for the input pin. When the number of interrupt...

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Problems solved by technology

The disadvantage of this method is that each external interrupt signal from the interrupt source will occupy an input pin of the MCU, and at the same time, the MCU needs to allocate corresponding interrupt processing resources for the input pin.

When the number of interrupt sources is small, this method can barely maintain normal functions; but when the number of interrupt sources is large, because the number of input pins of the MCU is always limited, it is difficult to meet the processing requirements of a large number of external interrupt signals. makes the scalability of the interrupt control unit limited

Moreover, as the number of interrupt sources increases, the interrupt processing resources occupied in the MCU will also increase significantly, thus increasing the resource occupation of the MCU.

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