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I've got problems with programming an AT89S2051. I'm using a programmer called ATMEL ISP from Ulrich Bangert (that's the link: http://ulrich-bangert.de/ATMELISP.zip). It's an really easy to build programmer, because it only uses an RS232 to TTL/CMOS converter and a 74HC126.
I've built it and it functions, because I'm able to program an AT89S8253 with it. But I'm not able to program an AT89S2051 or to read out the code memory of it. Sometimes when I try to program the 2051 all ports are LO (also after reset), but the most time nothing happens.

Can you help me? Why is the 2051 making problems?]]> Fri, 21 Mar 2008 03:10:18 -0700 http://www.8051projects.net/forum-t7412.html http://www.8051projects.net/forum-t7412.html contact@nospam.com (Ajay Bhargav) Fri, 21 Mar 2008 11:07:43 -0700 http://www.8051projects.net/forum-t7412.html http://www.8051projects.net/forum-t7412.html
The S in the part number AT89S2051 means it can be serially programmed in the target system. I have such a part and ISP programmer and will soon try it.

Maybe I've misunderstood you but surely Atmel's AT89S parts use the same algorithm?

]]> contact@nospam.com (Ajay Bhargav) Wed, 06 Aug 2008 09:12:34 -0700 http://www.8051projects.net/forum-t7412.html http://www.8051projects.net/forum-t7412.html Maybe I've misunderstood you but surely Atmel's AT89S parts use the same algorithm?


that need not be, AT89S51/52 share common algorithm but At89S53 has 4 bit (nibble) algorithm and also At89C55 is different to At89C55WD when it comes to programming.

best advice would be to read the Device datasheet and decide accordingly

Arun
]]> contact@nospam.com (Ajay Bhargav) Wed, 06 Aug 2008 20:00:18 -0700 http://www.8051projects.net/forum-t7412.html