programming atmel chip

[freeze]

i need to program the at89c51ed2(atmel chip). i am using the usb-rs232
for this purpose. all my circuit connections are properly wired n
everyhting recheked a thousand times. but still, the programming
software that i use, in order to program the chip, gives me a
'connection time out' error. have tried all sorts of RESET dance that
have been specified in the datasheet, but still no result.....wat
could possibly be wrong...

i am using the max232n chipfor the rs232 connection to
controller.....also tried flash magic programming software for the
same purpose ...but it failed too....


pls help me out.......

 

[BobG]

On Jan 19, 6:45�am, freeze <amithbn...@gmail.com> wrote:

i need to program the at89c51ed2(atmel chip). i am using the usb-rs232
===============================Search for 'parallel port programmer'. Serial programmers and parallel

programmers use the same 'bit bang' algorithm to shake the clock and
data lines... just driven fron a different port. Maybe your usb port
doesnt have good timing for bitbanging?

 

[Vince Morgan]

"BobG" <bobgardner@aol.com> wrote in message
news:b63dffd1-45a0-452b-8979-af30074973b0@n20g2000hsh.googlegroups.com...
On Jan 19, 6:45?am, freeze <amithbn...@gmail.com> wrote:

i need to program the at89c51ed2(atmel chip). i am using the usb-rs232
================================

Search for 'parallel port programmer'. Serial programmers and parallel
programmers use the same 'bit bang' algorithm to shake the clock and
data lines... just driven fron a different port. Maybe your usb port
doesnt have good timing for bitbanging?
I could be right off the mark here, but serial and parallel port timing
issues can be a problem with multitasking operating systems. There are
special kernel mode drivers around though that effectively allow you to
bypass the operating systems management layer. I've had to use one of these
before on Win2k to avoid these timing problems.
If that is the case, and you can't find one, I think I've still got the one
I used here,, somewhere. Worked very well.
Vince