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1、LISTP=16f877A#includenpl6f877a.inc”；定义所用单片机的头文件參rjwrjwrjwrjwrjwrjwrjwrjwrjwrjwrjwrjwrjwrjwrjwrjwrjwrjwrjwrjwrjwrjwrjwrjwrjwrjwrjwrjwrjwrjwrjwrjwrjwrjwrjwrjwrjwrjwrjwrjwrjwrjwrjwrjwrjwrjwrjwrjwrjwrjwrjwrjwrjwrjwrjwrjwrjwrjwrjwrjwrjwrjwrjwrjwrjwrjwrjwrjwCountEQU20HCount1EQU21HCou
2、nt2EQU22HKEYRESEQU23HADKEYHEQU24HL_REQU25HDLY1EQU26HDLY2EQU27HCNTEQU28HINC—FEQU29HCNT1EQU2AHINC_F1EQU2BHORG000HGOTOSTARTNOPSTARTCALLInitPWM12CALLInitADKEYMAINCALLGetADKEYGOTOMAINv{>*!，*!，*!，*!，*!，*!，*!，*!，*!，*!，*!，*!，*!，*!，*!，*!，*!，*!，*!，*!，*!，*!，*!，*!，InitADKEY:A/D转换初始化子程序MOVL
3、WMOVWF0X41ADCONO转换器BSFSTATUS,RPOMOVLW0X02MOVWFADCON1低6位为"0”BSFTRISA,0置RAO为输入方式;选择A/D通道为RAO,打开A/D;AD转换吋钟为FOSC/8;转换结左移，及ADRESL寄存器的;且把RA0口设置为模拟量输入方式;设BCFSTATUS,RP0RETURNGetADKEY;读取键值处理子程序BSFADCONO,GO;启动AD转换BTFSCADCONO,GO;等待A/D转换结束GOTO$-1MOVFADRESH，W;读取并存储A/D转换结果MOVWFADKEYH;判断键值1〜9
4、,若无键按卜，认为键值为0MOVLW0X31MOVWFKEYRESKEY1MOVLWOXCB;CC为S1按下对应A/D转换数字量的高8位SUBWFADKEYH,W;比较阈值设为CB可增强抗干扰能力BTFSSSTATUS,C;采用逐键比较判断GOTOKEY2GOTOKEYOUTKEY2INCFKEYRES,FMOVLW0XA8;A9为S2按下对应A/D转换数字量的高8位SUBWFADKEYH,WBTFSSSTATUS,CGOTOKEY3CALLDECIGOTOKEYOUTKEY3INCFKEYRES,FMOVLW0X8F;90为S3按卜*对应A/D转换
5、数字量的高8位SUBWFADKEYH,WBTFSSSTATUS,CGOTOKEY4CALLINCIGOTOKEYOUTKEY4INCFKEYRES,FMOVLW0X7D;7E为S4按下对应A/D转换数字量的高8位SUBWFADKEYH,WBTFSSSTATUS,CGOTOKEY5GOTOKEYOUTKEY5INCFKEYRES,FMOVLW0X6F;70为S5按卜*对应A/D转换数字量的高8位SUBWFADKEYH,WBTFSSSTATUS,CGOTOKEY6CALLDEC2GOTOKEYOUTKEY6INCFKEYRES,FMOVLW0X63;64
6、为S6按下对应A/D转换数字量的高8位SUBWFADKEYH’WBTFSSSTATUS,CGOTOKEY7CALLINC2GOTOKEYOUTKEY7INCFKEYRES,FMOVLW0X5A;5B为S7按下对应A/D转换数字量的高8位SUBWFADKEYH,WBTFSSSTATUS,CGOTOKEY8GOTOKEYOUTKEY8INCFKEYRES,FMOVLW0X53;54为S8按下对应A/D转换数字量的高8位SUBWFADKEYH’WBTFSSSTATUS,CGOTOKEY9GOTOKEYOUTKEY9INCFKEYRES，FMOVLW0X4C
7、;4D为S9按下对应A/D转换数字量的高8位SUBWFADKEYH,WBTFSSSTATUS,CGOTOKEYOGOTOKEYOUTKEYOMOVLW0x30;无键按下，返冋30作为主函数判断有无键按下的设定值MOVWFKEYRES;也吋以设定其他不与键值冲突的数值KEYOUTRETURN參rjwrjwrjwrjwrjwrjwrjwrjwrjwrjwrjwrjwrjwrjwrjwrjwrjwrjwrjwrjwrjwrjwrjwrjwrjwrjwrjwrjwrjwrjwrjwrjwrjwrjwrjwrjwrjwrjwrjwrjwrjwrjwrjwrjw
8、rjwrjwrjwrjwrjwrjwrjwrjwrjwrjwrjwrjwrjwrjwrjwrjwrjwrjw
