easy51

说明：  123456uyygbb温度传感器ds1820 的汇编程序 　 　 晶振：12M TEMPER_L EQU 36H TEMPER_H EQU 35H TEMPER_NUM EQU 60H FLAG1 BIT 00H DQ BIT P3.3 AAA:MOV SP,#70H LCALL GET_TEMPER LCALL TEMPER_COV LJMP AAA NOP ------------------读出转换后的温度值 GET_TEMPER: SETB DQ 定时入口 BCD:LCALL INIT_1820 JB FLAG1,S22 LJMP BCD 若DS18B20不存在则返回 S22:LCALL DELAY1 MOV A,#0CCH 跳过ROM匹配------0CC LCALL WRITE_1820 MOV A,#44H 发出温度转换命令 LCALL WRITE_1820
(Ds1820 temperature sensor 123456uyygbb the assembler crystal: 12MTEMPER_L EQU 36HTEMPER_H EQU 35HTEMPER_NUM EQU 60HFLAG1 BIT 00HDQ BIT P3.3AAA: MOV SP,# 70HLCALL GET_TEMPERLCALL TEMPER_COVLJMP AAANOP read out the converted temperature value GET_TEMPER: SETB DQ regularly import BCD: LCALL INIT_1820JB FLAG1, S22LJMP BCD if DS18B20 does not exist is returned S22: LCALL DELAY1MOV A,# 0CCH Skip ROM matching 0CCLCALL WRITE_1820MOV A,# 44H issued a temperature conversion command LCALL WRITE_1820)