sbit Key = P1^7;
uchar KEYPUTDOWN=0; uchar Keyscan(void) {
uchar keydown=0; if(Key==0)
{delay_ms(20);if(Key==0) keydown=1;} if(keydown==0) KEYPUTDOWN=0; return keydown; }
3. Reg51..h
#ifndef __REG52_H__ #define __REG52_H__
/* After is STC additional SFR */
/* sfr AUXR = 0x8e; */ /* sfr AUXR1 = 0xa2; */ /* sfr IPH = 0xb7; */
sfr P4 = 0xe8; sbit P43 = P4^3; sbit P42 = P4^2; sbit P41 = P4^1; sbit P40 = P4^0;
sfr XICON = 0xc0;
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sfr WDT_CONTR = 0xe1;
sfr ISP_DATA = 0xe2; sfr ISP_ADDRH = 0xe3; sfr ISP_ADDRL = 0xe4; sfr ISP_CMD = 0xe5; sfr ISP_TRIG = 0xe6; sfr ISP_CONTR = 0xe7;
/* Above is STC additional SFR */
/*-------------------------------------------------------------------------- REG51F.H
Header file for 8xC31/51, 80C51Fx, 80C51Rx+
Copyright (c) 1988-1999 Keil Elektronik GmbH and Keil Software, Inc. All rights reserved.
Modification according to DataSheet from April 1999 - SFR's AUXR and AUXR1 added for 80C51Rx+ derivatives --------------------------------------------------------------------------*/
/* BYTE Registers */ sfr P0 = 0x80; sfr P1 = 0x90; sfr P2 = 0xA0; sfr P3 = 0xB0; sfr PSW = 0xD0; sfr ACC = 0xE0;
sfr B = 0xF0; sfr SP = 0x81; sfr DPL = 0x82; sfr DPH = 0x83; sfr PCON = 0x87; sfr TCON = 0x88; sfr TMOD = 0x89; sfr TL0 = 0x8A; sfr TL1 = 0x8B; sfr TH0 = 0x8C; sfr TH1 = 0x8D; sfr IE = 0xA8; sfr IP = 0xB8; sfr SCON = 0x98; sfr SBUF = 0x99;
/* 80C51Fx/Rx Extensions sfr AUXR = 0x8E; sfr AUXR1 = 0xA2; sfr SADDR = 0xA9; sfr IPH = 0xB7; sfr SADEN = 0xB9; sfr T2CON = 0xC8; sfr T2MOD = 0xC9; sfr RCAP2L = 0xCA; sfr RCAP2H = 0xCB; sfr TL2 = 0xCC; sfr TH2 = 0xCD;
/* PCA SFR
*/
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sfr CCON = 0xD8; sfr CMOD = 0xD9; sfr CCAPM0 = 0xDA; sfr CCAPM1 = 0xDB; sfr CCAPM2 = 0xDC; sfr CCAPM3 = 0xDD; sfr CCAPM4 = 0xDE; sfr CL = 0xE9; sfr CCAP0L = 0xEA; sfr CCAP1L = 0xEB; sfr CCAP2L = 0xEC; sfr CCAP3L = 0xED; sfr CCAP4L = 0xEE; sfr CH = 0xF9; sfr CCAP0H = 0xFA; sfr CCAP1H = 0xFB; sfr CCAP2H = 0xFC; sfr CCAP3H = 0xFD; sfr CCAP4H = 0xFE; */
/* BIT Registers */ /* PSW */ sbit CY = PSW^7; sbit AC = PSW^6; sbit F0 = PSW^5; sbit RS1 = PSW^4; sbit RS0 = PSW^3; sbit OV = PSW^2; sbit P = PSW^0;
/* TCON */ sbit TF1 = TCON^7; sbit TR1 = TCON^6; sbit TF0 = TCON^5; sbit TR0 = TCON^4; sbit IE1 = TCON^3; sbit IT1 = TCON^2; sbit IE0 = TCON^1; sbit IT0 = TCON^0;
/* IE */ sbit EA = IE^7; sbit EC = IE^6; sbit ET2 = IE^5; sbit ES = IE^4; sbit ET1 = IE^3; sbit EX1 = IE^2; sbit ET0 = IE^1; sbit EX0 = IE^0;
/* IP */
/* sbit PPC = IP^6;*/ sbit PT2 = IP^5; sbit PS = IP^4; sbit PT1 = IP^3; sbit PX1 = IP^2; sbit PT0 = IP^1; sbit PX0 = IP^0;
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