????????DS1820????????????
????DS1820??????в???????????????????????????????????????????????????????????????????????(1)??С??????????????????????????в?????????DS1820????????????????????????????????DS1820???ж?д??????????????????д?????????????????????????PL/M??C?????????????????????????DS1820??????????ò??????????????????????????????????????DS18B20????????????
????(2)??DS1820???й??????о?δ??????????????DS1820???????????????????????????????DS1820???????????в?????????????????????DS1820????8???????????????????????????????????????????ж???????????????????
????(3)????DS1820????????????г??????????????У????????????????????????50m?????????????????????????????????????????????ε??????????????????150m??????????????????????????????ε???????????????????????????????????????????????????????β????????????????????DS1820???г?????????????????????????????????迹???????
????????DS18B20???(????)???
| ?????? | ?????? | ??????? |
??ROM | 33H | ??DS18B20?е?64λ???ROM???к? |
??????? | 44H | ??????????,???????????????????RAM?? |
д????? | 4EH | ??????????2??3 ??д???????????? |
???ROM | 55H | ?????????,??????64λROM???к???????????18B20 |
?????? | B4H | ????????????: 18B20??0?????????,1??????? |
?????? | BEH | ????????????9???????? |
????ROM | CCH | ???18B20?,?????????к????,?????????? |
???????? | ECH | ??к?,????????????????18B20??????? |
????ROM | F0H | ???????????????м???18B20,???ROM |
????(4)??DS18B20???????????У???DS18B20????????????????????????DS18B20???????????????DS18B20?????????????????????DS18B20???????з????????????????????????????????DS18B20???????????????????????????????????????????????????4о?????????????????????????????????VCC?????????β????????????
????P1.0??DS18B20????????ο??????????
????DQ??EQU??P1.0
????ORG??0000H
????AJMP??MAIN
????ORG??1000H
????MAIN:??LCALL??INIT_18B20??????????λ?????
????MOV??A,#0CCH
????LCALL??WRITE_18B20???????????? ?????????к????
????MOV??A,#4EH??????????????????д???????????
????LCALL??WRITE_18B20??
????MOV??A, #TH??????д??????????
????LCALL??WRITE_18B20
????MOV????A,#TL
????LCALL??WRITE_18B20??????д??????????
????MOV??A,??CONFIG12
????LCALL??WRITE_18B20?????????12λ???????
????MAIN1:??LCALL??INIT_18B20??????λ?????
????LCALL??RD_TEMPER?????????
????LCALL??LDVV??????????????????????,??д????
????LCALL??DISPLAY????????????????, ??????
????LJMP??MAIN1??
??**********DS18B20??λ????*****************
????INIT_18B20:??MOV??R7??#06H????????λ????????
????LOP0?? SETB??DQ??????????????????18B20?????
????MOV??R0,#0FBH
????CLR??DQ
????TSR1: DJNZ??R0,TSR1???????DQ????480??s??960??s
????SETB??DQ
????MOV??R0,#25H
????TSR2: DJNZ??R0,TSR2
????JNB??DQ ,TSR3??????18B20??DQ?????
????DJNZ??R7??LOP0????δ???????????飬6?ν???
????SETB??P2.0?????????????δ??鵽18B20
????SJMP??TSR4
????TSR3: SETB??FLAG1????????λFLAG1??????DS18B20????
????CLR??P2.0????????????????????
????TSR5: MOV??R0,#06BH
????TSR6: DJNZ??R0,TSR6??????????????
????CLR??C
????ORL??C?? DQ
????LOP1??JC??TSR4??????????????
????AJMP??TSR7
????TSR4: CLR??FLAG1????δ??鵽
????SETB??P2.0?????????????????
????SETB??DQ??????????????????????
????TSR7:??RET
??????*****************????????????****************
????RD_TEMPER:
????SETB??DQ
????LCALL??INIT_18B20
????JB??FLAG1,TSS2
????RET???????????????????????????
????TSS2: MOV??A,#0CCH??????????ROM
????LCALL??WRITE_18B20
????MOV??A,#44H????????????????????????
????LCALL??WRITE_18B20
????LCALL??DELAY??????????????????500ms
????LCALL??INIT_18B20????????λ?????
????MOV??A,#0CCH????????ROM
????LCALL??WRITE_18B20
????MOV??A,#0BEH??????????????????
????LCALL??WRITE_18B20
????LCALL??READ2_18B20?????????????????
????RET
??????***************дDS18B20????************
????WRITE_18B20:
????MOV??R2,#8
????SETB??DQ
????WR1: CLR??DQ
????MOV??R3,#6
????DJNZ??R3,$??????д?????15??s????
????RRC??A
????MOV??DQ,C????д???λ
????MOV??R3,#30
????DJNZ??R3,$???????18B20????
????SETB??DQ
????DJNZ??R2,WR1????8λд???
????SETB??DQ????????д?????
????RET
??????***********??18B20??????????????????*********
????READ2_18B20:
????MOV??R4,#2????????λ????29H,??λ????28H
????MOV??R1,#29H
????RE00: MOV??R2,#8
????RE01: CLR??DQ????????10??s
????NOP
????NOP
????NOP
????SETB??DQ???????????????
????MOV??R3,#7
????DJNZ??R3,$
????MOV??C,DQ???????????λ????C??
????MOV??R3,#30
????DJNZ??R3,$
????RRC??A
????DJNZ??R2,RE01????????8λ
????MOV??@R1,A??????????
????DEC????R1????????????????????
????DJNZ??R4,RE00????????????
????RET
??????************???????????????????**************
????LDVV:??MOV A,29H???? ??????????0
????MOV C,28H.0??????28H?е????λ????C
????RRC A
????MOV C,28H.1
????RRC A
????MOV C,28H.2
????RRC A
????MOV C,28H.3
????RRC A
????MOV 30H,A???????????????30H???
????JNC??LOP2????С??????????????????
????INC??30H
????LOP2:RET
????admin ?????????2018-05-08
