这是Proteus里的提示信息。发现时8255A的隐藏引脚VCC和GND没有设置好。在8255的属性--hidden Pins中 改VCC为VDD,GND为VSS即可
However, if the voltages or currents do not converge within a specified number of iterations, SPICE produces error messages (such as singular matrix, Gmin stepping failed, source stepping failed or iteration limit reached) and aborts the simulation. SPICE uses the results of each simulation step ...
Fatal Error: Analysis Failed: Iteration limit reached Code: [Select]Good run with LT1494Circuit: * C:\Users\Owner\Documents\LTspiceXVII\OpAmp.ascInstance "m:m1:1": Width narrower than recommended for a level 3 MOSFET.Direct Newton iteration failed to find .op point. (Use ".option noop...
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