Why do the lower four bits of the digital tube always output high level? - 51mcu

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Just looking around

Why is the pin of a 51 MCU directly grounded when the IO port is outputting high level? How much current is output by the pin? How much internal resistance is there when the pin is input?
Whyisthepinofa51MCUdirectlygroundedwhentheIOportisoutputtinghighlevelHowmuchinternalresistanceistherewhenthepinisinput?
Why can\'t the P0 port of STC8A8K32S4A12 output a high level?
Whycan'ttheP0portofSTC8A8K32S4A12outputahighlevelWhenthelowlevelisset,0Visnormal,andthehighlevelcanonlyreach1Thepowersupplyvoltageis5V
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