Ashwin Nayak wrote:
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i have made my own programmer using 74hc373 latch for control signals and one transistor for changing between programming voltage and reading voltage; for programming the at89c2051. could someone suggest me how to create exact time delays (between 1 micro-second to 110 micro second) for the negative going programming pulse on P3.2.

A simple and (in-efficient) way is to use a for loop doing nothing. But if you need accurate timing the software will have to run in DOS. What I have sometimes done is run through a (very) large loop noting the time before and after entering the loop. Then if you know that a loop running 1000000 times takes 10 sec. to run, you can easily figure out how many runs you need for 100µs.

also could someone suggest some sorce code examples in C not pascal.

For what parts of the software?

Best regards,

Mikkel C. Simonsen