【正文】 100um DJNZ R3,$ NOP RRC A DJNZ R2,RE01 MOV R1,A INC R1 DJNZ R4,RE00 RETT_BCD: MOV A,26H ANL A,0F8H JZ C1 CLR C MOV A,25H CPL A ADD A,01H MOV 25H,A MOV A,26H CPL A ADDC A,00H MOV 26H,A MOV 29H,0BH SJMP C2 C1: MOV 29H,0AH C2: MOV A,29H SWAP A MOV 29H,A MOV A,25H ANL A,0FH MOV DPTR,TAB0 MOVC A,A+DPTR MOV 2AH,A MOV A,25H ANL A,0F0H SWAP A。清標志位,表示DS18B20不存在 JMP DSR7DSR5: MOV R0,6BHDSR6: DJNZ R0,$ 。等待DS18B20回應 DJNZ R0,DSR2 JMP DSR4DSR3: SETB 。主機發(fā)出復位低脈沖 MOV R1,04HDSR1: DJNZ R0,$ MOV R0,6BH DJNZ R1,DSR1 SETB 。向DS18B20發(fā)出讀溫度命令 LCALL WR18B20 LCALL RE18B20 。準備讀溫度前先復位DS18B20 MOV A,0CCH 。跳過ROM匹配 LCALL WR18B20 MOV A,44H 。調用讀溫度子程序 LCALL T_BCD LCALL DISPBCD RETK1: LCALL RING MOV DPTR,0D00BH MOV A,0A2H MOVX DPTR,A CLR FAN1: LCALL XIANSHI SETB SETB SETB SETB SETB LCALL DELAY1 JNB ,K11 JNB ,K8 JNB ,FAN2 JNB ,SET1 JNB ,SET11 AJMP FAN1SET1: LCALL RING MOV R7,66H LCALL ADD1 SJMP WR1SET11: LCALL RING MOV R7,66H LCALL SUBB1 SJMP WR1WR1: MOV 66H,A CJNE A,100H,FAN1 MOV 66H,00H AJMP FAN1FAN2: LCALL RINGK2: LCALL XIANSHI SETB SETB SETB SETB SETB LCALL DELAY1 JNB ,FAN1 JNB ,K8 JNB ,FAN3 JNB ,SET2 JNB ,SET22 AJMP K2SET2: LCALL RING MOV R7,65H LCALL ADD1 SJMP WR2SET22: LCALL RING MOV R7,65H LCALL SUBB1 SJMP WR2WR2: MOV 65H,A CJNE A,13H,K2 MOV 65H,01H AJMP K2K8: LCALL WR_887K11: LCALL K7FAN3: LCALL RINGK3: LCALL XIANSHI SETB SETB SETB SETB SETB LCALL DELAY1 JNB ,FAN2 JNB ,K8 JNB ,FAN4 JNB ,SET3 JNB ,SET33 AJMP K3SET3: LCALL RING MOV R7,64H LCALL ADD1 SJMP WR3SET33: LCALL RING MOV R7,64H LCALL SUBB1 SJMP WR3WR3: MOV 64H,A MOV A,64H CJNE A,32H,K3 MOV 64H,01H AJMP K3FAN4: LCALL RINGK4: LCALL XIANSHI SETB SETB SETB SETB SETB LCALL DELAY1 JNB ,FAN3 JNB ,K8 JNB ,FAN5 JNB ,SET4 JNB ,SET44 AJMP K4SET4: LCALL RING MOV R7,63H LCALL ADD1 SJMP WR4SET44: LCALL RING MOV R7,63H LCALL SUBB1 SJMP WR4WR4: MOV 63H,A MOV A,63H CJNE A,08H,K4 MOV 63H,01H AJMP K4K10: LCALL WR_887FAN5: LCALL RINGK5: LCALL XIANSHI SETB SETB SETB SETB SETB LCALL DELAY1 JNB ,FAN4 JNB ,K10 JNB ,FAN6 JNB ,SET5 JNB ,SET55 AJMP K5SET5: LCALL RING MOV R7,62H LCALL ADD1 SJMP WR5SET55: LCALL RING MOV R7,62H LCALL SUBB1 SJMP WR5WR5: MOV 62H,A MOV A,62H CJNE A,24H,K5 MOV 62H,00H AJMP K5FAN6: LCALL RINGK6: LCALL XIANSHI SETB SETB SETB SETB SETB LCALL DELAY1 JNB ,FAN5 JNB ,K10 JNB ,FAN7 JNB ,SET6 JNB ,SET66 AJMP K6SET6: LCALL RING MOV R7,61H LCALL ADD1 SJMP WR6SET66: LCALL RING MOV R7,61H LCALL SUBB1 SJMP WR6WR6: MOV 61H,A MOV A,61H CJNE A,60H,K6 MOV 61H,00H AJMP K6FAN7: LCALL RINGK7: LCALL XIANSHI SETB SETB SETB SETB SETB LCALL DELAY1 JNB ,FAN6 JNB ,WR_887 JNB ,K9 JNB ,SET7 JNB ,SET77 AJMP K7SET7: LCALL RING MOV R7,60H LCALL ADD1 SJMP WR7SET77: LCALL RING MOV R7,60H LCALL SUBB1 SJMP WR7WR7: MOV 60H,A MOV A,60H CJNE A,60H,K7 MOV 60H,00H AJMP K7K9: LCALL RING LCALL FAN1RING: CLR CALL DELAY1 SETB CALL DELAY20 RETWR_887: CALL RING ACALL DELAY MOV DPTR,0D000H MOV A,60H MOVX DPTR,A INC DPTR INC DPTR MOV A,61H MOVX DPTR,A