8051用DS18B20测温,4小数用1602显示,P1^7 为DS18B20单总线引脚,P2^4-P2^6对应1602的:RS,RW,EN.P0^0-P0^7为1602DB0-DB7接口.-8051 with the DS18B20 temperature measurement, with the 1602 show four decimal places, P1 ^ 7 for the DS18B20 single bus pin, P2 ^ 4-P2 ^ 6 corresponds to 1602' s: RS, RW, EN.P0 ^ 0-P0 ^ 7 for 1602DB0- DB7 interface.