Hi all,

I copied a working code for 8031 with 10Mhz cstl, in to a 89c51 and put 89c51 inplace of 8031. The cct works well with the Eprom. Now i removed the eprom and connected pin31 of uc to +5V. But the cct does not work with internal program in 89c51. What mistake I am doing.

D.Dass