slick7
Newbie level 4

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.
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.