is89c52a-40pl - programming through 44->40 pin adapte

[slick7]

is89c52a-40pl

I have some is89c52a-40pl plcc package microcontrollers. And i have a 44 plcc to 40 pin adapter. I have a genius 540 programmer that indicates it programs is89c52a and is89c52a (p44). However it will not erase my chips.It does read the signature bytes ok . According to the data sheet these chips have two programming voltages 12 and 5 and mine are five according to signature bytes,which may be the conflict. Questions : what does the (p44) indicate and does the plcc package need a special adapter or does the one to one 40 pin adapter work .Also when it reads my chips the buffer is all 55s.I have multible chips and they all read the same.

 

[IanP]

Re: is89c52a-40pl

44 indicates only pin numbers; the 44-to-40 pin adaptor should work fine and most likely all you micros are locked with lock-bits and what you read is NOT data from the program memory ..
After all this is the C-version and from your post it doesn’t sound like they have a window that allows you to erase them with UV, so they are just OTP (one-time-programmable) and therefore can NOT be re-programmed ..

Rgds,
IanP

 

[slick7]

Re: is89c52a-40pl

Thanks for the reply. I am glad the adapter will work. The data sheets for that microcontroller says it can be reprogrammed as well with most companies that make a 89c52. I am no expert on this ,so is there some other information on the chip that would define which type of chip I have,otp or flash. thanx