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hey i am using p89v51rd2 8051 microcontroller in robo application i connected port3.0 pin of controoler to l293d chip of pin 2 ,and port3.1 pin of controller to l293d chip of pin 7; port3.0=1 port3.1=0 but at port3.1 voltage is fluctuting from 4 to 2 volt i am facing this problem from last few days plzz suggest me some solution
It's a motor driver. www.ti.com/.../l293.pdf
Do you have motors attached, or is this an unloaded test?
Does your system have sufficient a current source, or is this causing the system voltage to drop?
l293d chip of pin 7; non-descriptive, do not use pin numbers, they are package dependent