Well - I've had great fun trying to program one of these. The datasheets
dont seem to exist any more and there is very little information on how to
program these.

Most of the info I found was on the PCF version and its equivalents.

From what I could find, it was pin and algorithm compatible with the 24c01
so I knocked up a programmer and tried 3 different programs to try and
program them.

All the programs / programmers would read the PCD8572 as a 24C01 but none of
them would program them. Picprog came up with an Acknowledge problem while
Ponyprog (excellent program) would throw up an error then the chip would
become unreadable before power was cycled.

In desperation, I managed to find a circuit diagram of an old television set
which used the PCD8572 and there was a 2n2 capacitor between pin 7 of the
eeprom and ground and a 10k resistor between pin 7 and +5 volts.

I made this modification to my programmer and lo and behold - it worked
first time.

I'm sending this to the Piclist in case anyone else has this problem in the
future - could save you a couple of days of "research" time.

Regards

Dom

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