I need to read back a Motorola 68HC705

[penrico]

68hc705

Do somebody how to read back the code programed in a motorola 68HC705 microcontroller??

Thanks in advance.

 

[BENOIT]

68hc705 forum

which version?
at address **broken link removed** (bottom
page I give data to read a 68705P3;
I can also read 68705R3.
some 68HC705 can be read (not secured)
MB.

 

[comalco]

68705p3

Nearly all HC705 can be read back - but not in the direct sense....

you need to single step through in VERIFY mode, trying each hex value from 00 to FF in each location, one at a time, until you can get through an entire pass without a fail...........

easiest to do with a little VB app controlling the MCU address lines via a PC parallel port............