硬件平台：C8051F314 包括键盘扫描程序

				// 宏定义文件
				//------------------------------------------------------------------------------------
				//
				// FILE NAME      : DEFINE.H
				// TARGET DEVICE  : C8051F314
				// CREATED ON     : 07/14/06
				// CREATED BY     : Jzp
				//
				// 文件说明：宏定义文件
				 
				typedef unsigned char UCHAR;
				typedef signed char SCHAR;
				typedef unsigned int UINT;
				typedef unsigned char BOOLEAN;
				#define FALSE1 0
				#define TRUE1 1
				
				#define  SYSCLK         24500000             // System clock frequency
				#define  SMB_FREQUENCY  50000                // Target SMBus frequency
				#define  BAUD_RATE 9600                      // UART0 波特率
				
				
				#define KEY_COL0 P1^0 
				#define KEY_COL1 P1^1 
				#define KEY_COL2 P1^2 
				#define KEY_COL3 P1^3 
				
				#define KEY_ROW0 P1^4
				#define KEY_ROW1 P1^5
				#define KEY_ROW2 P1^6
				#define KEY_ROW3 P1^7
				#define KEY_ROW4 P2^0
				#define KEY_ROW5 P2^1
				#define KEY_ROW6 P2^2
				#define KEY_ROW7 P2^3
				#define KEY_ROW8 P2^4
				#define KEY_ROW9 P2^5
				#define KEY_ROW10 P2^6
				
				#define LED_ALPHA_ON() P2^7 = 0
				#define LED_ALPHA_OFF() P2^7 = 1
				
				// sfr定义
				sfr16  TMR3RL = 0x92;                  // Timer2 reload registers
				sfr16  TMR3 = 0x94;                    // Timer3 counter registers
				//sfr16  TMR0 = 0X8A;                    // Timer0
				
				sfr16  TMR2RL = 0xca;                  // Timer2 reload registers
				sfr16  TMR2 = 0xcc;                    // Timer2 counter registers
				
				//sfr16  TMR0 = 0xcc;                    // Timer2 counter registers
				
				
				sbit KbIrqOut = P0^6;     //键盘中断请求
				sbit BatIrqOut = P0^7;    //电池电量低中断请求
				sbit KbBlCtl = P3^2;      //键盘有动作，键盘灯点亮，否则经过延时后，熄灭
				sbit AlphaLed = P2^7;
				sbit DQ = P3^1;
				
				//#define KEY_ROW_LOW(0) P1 = 0xef
				//#define KEY_ROW_LOW(1) P1 = 0xdf
				//#define KEY_ROW_LOW(2) P1 = 0xbf
				//#define KEY_ROW_LOW(3) P1 = 0x7f
				//#define KEY_ROW_LOW(4) P2 &= 0x80; P2 |= 0x7e
				//#define KEY_ROW_LOW(5) P2 &= 0x80; P2 |= 0x7d
				//#define KEY_ROW_LOW(6) P2 &= 0x80; P2 |= 0x7b
				//#define KEY_ROW_LOW(7) P2 &= 0x80; P2 |= 0x77
				//#define KEY_ROW_LOW(8) P2 &= 0x80; P2 |= 0x6f
				//#define KEY_ROW_LOW(9) P2 &= 0x80; P2 |= 0x5f
				//#define KEY_ROW_LOW(10) P2 &= 0x80; P2 |= 0x3f
				//#define KEY_ROW_HIGH P1 = 0xff; P2 &= 0x80; P2 |= 0x7f
				#define KEY_ROW_ALL_LOW P1 = 0X0F; P2 &= 0X80