[51] 8051 programming and execution

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tapu

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Hi, I am using AT89c51.I am making project.problom is If I write program 1780 bytes then controller runs partially & lcd shows message but keypad does not work.if I write above 2080 bytes then controller takes too time to start running. and RTC time & date not displayed.I am using USB programmer & keil(unlicensed).
 

Check the voltage on ALE (pin30) voltages, if it is less then 1.6v then it may be because of ur Crystal ...
 

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