Welcome to our site! EDAboard.com is an international Electronics Discussion Forum focused on EDA software, circuits, schematics, books, theory, papers, asic, pld, 8051, DSP, Network, RF, Analog Design, PCB, Service Manuals... and a whole lot more! To participate you need to register. Registration is free. Click here to register now.
Please check whether proper power-on-reset signal applied to the Microcontroller. If you don't have the power supply supervisor in your circuit, just a R and C would work fine with a delay of atleast 10µsecs.
ALE signal will be generated by the 80C51 if your program contains instructions that accesses external address. Eg: MOV DPTR,#8000, MOVX A,@DPTR etc. If the circuit is perfect, you will get ALE without interruption. Ensure
1. Proper power supply
2. Power-ON Reset
3. Crystal with low value (22pf or 33pf) load capacitor
This site uses cookies to help personalise content, tailor your experience and to keep you logged in if you register.
By continuing to use this site, you are consenting to our use of cookies.
