C51 global initialization and precise delay procedure, 51 single-chip accurate delay procedure

C51 global initialization and precise delay procedure, 51 single-chip accurate delay procedure Keywords: single-chip delay procedure / ************************************************* ************************************************** ******* Initialization Program * QiZhao, 2007 * All Rights Reserved * File: initial.h * By: QiZhao * Contact: [email protected]** Version: V2.1 γ * Corrector: QiZhao * Date: 2008.2.1 (Last modified) ** Remarks: Common set of macro definitions keyword, and by setting controlled * crystal oscillator frequency precision delay subroutine ********************. ************************************************** ************************************ / #ifndef _initial_h_#define _initial_h_ / ************************************************* ************************************************** ******** Global macro definitions *************************************** ************************************************** ***************** / #include // AT89S52 #include // Absolute address access #include // Related to the string #include // Related to Assembly Language #include // unicode conversion #include // Mathematics functions packet #include // Standard input or output #include // Memory Management #define TRUE 1 #define FALSE 0 #define bool bit // Boolean variable #define uchar unsigned char #define uint unsigned int #define ulong unsigned long #define FOSC 12000000UL // The frequency of crystal #define NOP _nop_(); / ************************************************* ************************************************** ******** Accurate delay (5us, 10us) *********************************** ************************************************** ********************* / void delay10us (void) // FOSC->12000000 {NOP NOP NOP NOP NOP NOP} void delay5us (void) // FOSC->12000000 {NOP} / ************************************************* ************************************************** ******** Accurate delay (1ms ~ 255ms) *********************************** ************************************************** ********************* / #define WAITE_HI (FOSC / 2/12/1000 >> 8) #define WAITE_LOW (FOSC / 2/12/1000 & 0xFF) void delayms (uchar time) {do {uchar j; ! #If WAITE_HI = 0 j = 0; {uchar i; for (i = WAITE_HI;. I .1882 0; i--) {while (--j);}} #endif ! #If WAITE_LOW = 0 j = WAITE_LOW; while (--j); #endif } While (--time);} / ************************************************* ************************************************** ******** Includes not repeat *************************************** ************************************************** ***************** / #endif, Read more

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