Hi guys,
I posted on here a while back about a project I wanted to do http://forum.allaboutcircuits.com/showthread.php?t=64354
I got some great advice and so went away to learn a little before taking on the project as I obviously needed to get some more skills.
Anyhoo - it's time I think to tackle that original project - and from what I can see I need an 18F with >512b RAM that can operate at 4V with as few pins as possible (size constrained). However, this is my first selection so I'm a little overwhelmed by the choice. I'm erring towards the 18F2420 or 18F2450. Can any guru confirm if these suit or where I've gone wrong if they're unsuitable (so I can learn).
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For Info the basic background for the project and it's details are below:
Basically I need a PIC to act as an I2C slave reading and writing to an EEPROM and then when required writing the entire contents of that EEPROM to an MMC card or reading data from the MMC and writing it to that EEPROM. The EEPROM is required (I think) to act as a 'speedy' (both boot and addressable) 64K permanent memory block for small bits of data (<512B). Mind you I'm confused as a newbie a little here as I suspect I could do this with the PIC alone although physical size of the chip may be an issue. Clock speed will be 20MHz and is intended through an external crystal (as I'm familiar now with this!).
Physical size of the circuit will be an issue as the board must be 23mm x 34mm, but small form factors should help here. The other thing I'm constrained by is my programmer. After some research I bought a cheap K150 knock-off (in case I didn't like electronics) and, surprise, it has worked well and I've built a few projects with it from around the web. I could upgrade it, but if I can get away with something I know and like that'd be cool.
--------------------
Cheers guys! I didn't really expect to enjoy this kind of stuff as much as I do - but have now been bitten by the bug - I'm sure electronics wasn't this interesting at school/uni! I just feel like such a noob
RRMC
I posted on here a while back about a project I wanted to do http://forum.allaboutcircuits.com/showthread.php?t=64354
I got some great advice and so went away to learn a little before taking on the project as I obviously needed to get some more skills.
Anyhoo - it's time I think to tackle that original project - and from what I can see I need an 18F with >512b RAM that can operate at 4V with as few pins as possible (size constrained). However, this is my first selection so I'm a little overwhelmed by the choice. I'm erring towards the 18F2420 or 18F2450. Can any guru confirm if these suit or where I've gone wrong if they're unsuitable (so I can learn).
--------------------------
For Info the basic background for the project and it's details are below:
Basically I need a PIC to act as an I2C slave reading and writing to an EEPROM and then when required writing the entire contents of that EEPROM to an MMC card or reading data from the MMC and writing it to that EEPROM. The EEPROM is required (I think) to act as a 'speedy' (both boot and addressable) 64K permanent memory block for small bits of data (<512B). Mind you I'm confused as a newbie a little here as I suspect I could do this with the PIC alone although physical size of the chip may be an issue. Clock speed will be 20MHz and is intended through an external crystal (as I'm familiar now with this!).
Physical size of the circuit will be an issue as the board must be 23mm x 34mm, but small form factors should help here. The other thing I'm constrained by is my programmer. After some research I bought a cheap K150 knock-off (in case I didn't like electronics) and, surprise, it has worked well and I've built a few projects with it from around the web. I could upgrade it, but if I can get away with something I know and like that'd be cool.
--------------------
Cheers guys! I didn't really expect to enjoy this kind of stuff as much as I do - but have now been bitten by the bug - I'm sure electronics wasn't this interesting at school/uni! I just feel like such a noob
RRMC