8051外部中断 [英] 8051 external interrupt

问题描述

如何启用8051的外部中断?

how to enable external interrupt of 8051?

推荐答案

每个8051s中断在中断允许(IE)特殊功能寄存器(SFR)中都有其自己的位，并且可以通过将相应的位置1来使能.下面的代码示例以8051汇编语言以及C语言编写，以提供正在发生的情况的大致概念.

Each of the 8051s interrupts has its own bit in the interrupt enable (IE) special function register (SFR) and is enabled by setting the corresponding bit. The code examples below are in 8051 assembly as well as C to provide a general idea of what is taking place.

要启用外部中断0(EX0)，需要设置IE的位0.

To enable external interrupt 0 (EX0) you need to set bit 0 of IE.

SETB EX0或ORL IE,#01或MOV IE,#01

要启用外部中断1(EX1)，需要设置IE的第3位.

To enable external interrupt 1 (EX1) you need to set bit 3 of IE.

SETB EX1或ORL IE,#08或MOV IE,#08

然后需要通过将IE的位7设置为全局中断，该位是全局中断允许/禁止位(EA).如有必要，可以通过中断优先级(IP)SFR将外部中断的优先级设置为高.

Interrupts then need to be globally enabled by setting bit 7 of IE, which is the global interupt enable/disable bit (EA). If necessary, you can set the priority of the external interrupts to high via the interrupt priority (IP) SFR.

SETB EA或ORL IE,#80

C中的示例:

#define IE (*(volatile unsigned char *)0xA8)
#define BIT(x) (1 << (x))
...
IE &= ~BIT(7); /* clear bit 7 of IE (EA) to disable interrupts */
...
IE |= BIT(0);  /* set bit 0 of IE (EX0) to enable external interrupt 0 */
...
IE |= BIT(1);  /* set bit 3 of IE (EX1) to enable external interrupt 1 */
...
IE ^= BIT(7)   /* toggle bit 7 of IE (EA) to re-enable interrupts */

或

IE = 0x89;  /* enable both external interrupts and globally enable interrupts */

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各种8051 C编译器供应商通常会定义自己的设置中断功能的方法.您可能需要查阅特定编译器的文档.

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The various 8051 C compiler vendors often define their own methods of setting up interrupt functions. You may need to consult the documentation for your specific compiler.

使用Keil C51编译器定义中断功能(指向应用说明的pdf链接)，指定了中断号和寄存器组，其中中断号对应于特定的中断向量地址.

To define an interrupt function using the Keil C51 Compiler (pdf link to application note), an interrupt number and register bank is specified where the interrupt number corresponds to a specific interrupt vector address.

void my_external_interrupt_0_routine(void) interrupt 0 using 2
{
/* do something */
}

使用8051 IAR C/C ++编译器(icc8051)定义中断功能( pdf参考指南链接)，可以使用__interrupt关键字和#pragma vector指令.

To define an interrupt function using the 8051 IAR C/C++ Compiler (icc8051) (pdf link to reference guide), the __interrupt keyword and the #pragma vector directive can be used.

#pragma vector=0x03
__interrupt void my_external_interrupt_0_routine(void)
{
/* do something */
}

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如果您是8051的新手，可以在 www.8052.com 上找到大量信息.我还建议> 8051/8052微控制器:体系结构，汇编语言和硬件接口 由网站管理员和8052.com的作者克雷格·斯坦纳(Craig Steiner)撰写.

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If you are new to the 8051, there is a wealth of information available at www.8052.com. I would also recommend The 8051/8052 Microcontroller: Architecture, Assembly Language, and Hardware Interfacing written by Craig Steiner, the webmaster and author of 8052.com.

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