A bad design example in almost every way. - Page 2 - Electronic Circuits Projects Diagrams Free

**Nigel Goodwin** · 9th January 2008, 12:15 PM

Quote:

Originally Posted by Pommie

I don't think the 628 was released until 99. I have the 1996 Microchip Microcontroller databook and even the 16F84 isn't mentioned, just the 16c84. I still have my UV eraser that I used to erase them.

No ICSP then.

Why would you have a UV eraser for a 16C84?, it's an EEPROM chip (the first MicroChip one), it was replaced by the 16F84 because of security issues over the code protection - basically the F84 was the same chip, with the flaw solved. Not long afterwards the F84A replaced that, just a later silicon revision, no significant changes really.

Pommie · 9th January 2008, 01:23 PM

Your right, I didn't need a UV eraser for the 16c84, however, there were some pic chip that I had to use it for. I also had to dig it out about 2 years ago to erase the 16c745.

Mike.

**Nigel Goodwin** · 9th January 2008, 02:09 PM

Quote:

Originally Posted by Pommie

Your right, I didn't need a UV eraser for the 16c84, however, there were some pic chip that I had to use it for. I also had to dig it out about 2 years ago to erase the 16c745.

As the 16C84 was the first (and only for quite some time!) EEPROM PIC they carried on using the C designation (which I don't thing actually signified anything) - but once they saw how popular it was, and had to redesign the flawed 16C84, they took the opportunity to alter the designation to F rather than C. Note that the 'F' doesn't signify 'FLASH' as many appear to think, it was just a different letter to 'C', and most F series PIC's are EEPROm rather than FLASH.

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9th January 2008, 01:23 PM	(permalink)
Pommie	Your right, I didn't need a UV eraser for the 16c84, however, there were some pic chip that I had to use it for. I also had to dig it out about 2 years ago to erase the 16c745. Mike.