help me impul port ALE (30) 89c51!

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vanbayhoang

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I don't creat impul ALE = 1/6 crystal 89c51.
any helf me
thanhks
(sorry my english not good)
 

Re: helf me impul port ALE (30) 89c51!

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.
 
Re: helf me impul port ALE (30) 89c51!

thanks ! but I don't output (ALE) impul 2Mb (1/6 crystal 12mb 8051), when simulation for Proteus!
Help me!
thanks
 

Re: helf me impul port ALE (30) 89c51!

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
 
Re: helf me impul port ALE (30) 89c51!

thanks for your help !
Have fun !
 

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