51单片机外部中断的c51编程（51 singlechip external interrupt C51 programming）.docVIP

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51单片机外部中断的c51编程（51 singlechip external interrupt C51 programming）.doc

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51单片机外部中断的c51编程（51 singlechip external interrupt C51 programming）

51单片机外部中断的c51编程（51 singlechip external interrupt C51 programming） Relevant knowledge: 1, 51 SCM 5 large and medium-sized broken source: serial port interrupt, timing interrupt 1, external interrupt 1, timing interrupt 0, external interrupt 0; 2, interrupt source number: serial port interrupt is 4, time interrupt 1 is 3, external interrupt 1 is 2, time interrupt 0 is 1, external interrupt 0 is 0; 3, interrupt source priority: in accordance with the above arrangement, the serial port interrupt minimum, and external interrupt 0 highest; 4 、 use external interrupt 0 and 1, must TCON register set, its trigger mode is low level trigger (0) or the falling edge trigger (1); 5 、 before use, you must open the total interrupt and its interrupt through the IE register; The basic / external interrupt routine -1 (without the use of interrupt, keyboard scanning for general port scanning) / / this is a routine specially arranged, and to use the external interrupt routine is compared to a 2 / / a button control one of the bright lights began not bright, click the light, then click again to exterminate, and bright........ #include reg52.h Sbit k1=P3^2; Sbit led=P2^7; Void delay_ms (unsigned int XMS); //ms level delay subroutine Void (key_scan); / / statement keyboard scanning function //================================================= Void, main () { Led=1; / / power on initialization, LED light is not bright While (1) { Key_scan (); Delay_ms (3000); } } //================================================= Void delay_ms (unsigned, int, XMS) //ms level delay subroutine {unsigned, int, x, y; For (x=xms; x0; x--) For (y=130; y0; y--);} //------------------------------------------------- Void (key_scan) / keyboard scan function {if (k1==0) / / key press? (k1=0?) {delay_ms (10); / / delay jitterelimination If (k1==0) / / is indeed a key is pressed, then: {led=! LED; / / turn lamp state While (K1!);} / / wait button release } } //------------------------------------------------- External i