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微处理器的判断主要通过对如下各项的检测: (1)检查微处理器IC的电源供给电压,正常时应为+5V,不得低于4.3V。 (2)检查晶振时钟信号,正常时应有4～6MHz正弦信号。幅度不得低于2V_(P-P)。 (3)检查送往操作电路的键扫描脉冲,正常时应有幅度为5V_(P-P)的脉冲列。 (4)检查串行数据信号和串行时钟信号的输出输入端,正常时都应有幅度为5V_(P-P)的脉冲列。 (5)检查各引脚的直流工作电压,并与技术参数对照。上述各项任何一项不正常都会引起微处理器故障。
Microprocessor mainly through the detection of the following tests: (1) Check the microprocessor IC power supply voltage, normal should be +5 V, shall not be less than 4.3V. (2) Check the crystal clock signal, normal should be 4 ~ 6MHz sinusoidal signal. Amplitude of not less than 2V_ (P-P). (3) check the key scan pulse sent to the operating circuit, the normal pulse amplitude should be 5V_ (P-P). (4) Check the serial data signal and the serial clock signal output input should normally have a pulse width of 5V_ (P-P). (5) Check the DC voltage of each pin, and with the technical parameters. Any of the above is not normal will cause a microprocessor failure.