地磁炉控制程序 （带三位8字数码管显示，MCU用HOLTEK 46R47，18PIN，8M晶振，取消所有I/O口的内部上拉电阻）-geomagnetic furnace control procedures (with three eight characters Digital Display, MCU with HOLTEK 46R47. 18PIN, 8M Oscillator, the abolition of all I / O I draw the internal resistan