Interrupt processing method and microcontroller

Abstract

The embodiment of the invention discloses an interrupt processing method and a microcontroller. The interrupt processing method comprises the following steps of: when a responded interrupt program is provided, executing a long call instruction which comprises seven clock cycles; pushing a value of a current process pointer down to a stack to protect a breaking point; in the second clock cycle andthe fourth clock cycle of the long call instruction, transmitting a corresponding interrupt entry address to a program bus; and in the sixth clock cycle of the long call instruction, transmitting theinterrupt entry address to the program pointer from the program bus so as to execute the next instruction from the interrupt entry address after the interrupt program is executed. The interrupt processing method is applicable for the interrupt processing of the microcontroller.

Description

technical field

[0001] The invention relates to the technical field of microcontrollers, in particular to an interrupt processing method and a microcontroller. Background technique

[0002] At present, computers all have real-time processing functions, relying on interrupt technology, computers can make timely processing of events that occur randomly in the outside world. When the CPU is processing something, an external event requires the CPU to process it quickly, such as a level change, a pulse edge occurrence, or timer count overflow, etc., so the CPU temporarily suspends the current work. Go to handle the event that occurred. After the CPU finishes processing the event, it returns to the place where it was originally suspended and continues the original work. Such a process is an interruption.

[0003] The traditional 8051 microcontroller uses 12 clock cycles as a machine cycle, a machine cycle consists of 6 states, each state consists of two clock cycles, the execut...

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