Whats what?

[Kryten]

Hi im trying to get a project running. The PIC18F4550 is not working, so im going to change to PIC18F452 but i cant find it on Microchips pages so im asking if its the same as PIC18F4520?

 

[Pommie]

The 452 is in the Pic18Fxx2 data sheet. They do recommend that you use the 18F4520 instead.

Mike.

 

[Kryten]

Yeh but i cant find it in the PIC18 family "tree"

 

[ericgibbs]

Yeh but i cant find it in the PIC18 family "tree"

Have you clicked on Pommies link.???

 

[Kryten]

Yhe but i saw it after posting a reply

 

[futz]

Yeh but i cant find it in the PIC18 family "tree"

That's because it's not there. Instead, scroll right to the bottom of **broken link removed** and click on Mature PIC MCUs. All obsolete models are listed there.

 

[Kryten]

HEHE thanks futz..
Yes i see that 4520 is its replacement and it has the same pinot as the 452..

 

[gramo]

Hi im trying to get a project running. The PIC18F4550 is not working, so im going to change to PIC18F452 but i cant find it on Microchips pages so im asking if its the same as PIC18F4520?

Were you trying to use PLL or the internal oscillator? Chances are you didn't set it up correctly? Also, did you have 5V on MCLR and Both Vdd and Vss pins connected - there are two of each

 

[Kryten]

Yes i have 5V on both Vdd and both Vss pins conected. I use a 10K -> Vdd on MCLR. Im trying to use PLL and I think its set up correctly (im using MikroC and ppl have checked and they say its ok)

The project is making a energymeter that loggs to a SDcard.

 

[v1r05]

(MikroC || PICC) + PLL = unwanted headache
if u can use inline assembly, check the datasheet to see how its done.
havent done it personally so i cant help there but i tried to enable the PLL with PICC and its just a pain in the arse

 

[blueroomelectronics]

Or use C18 or Swordfish BASIC, Swordfish has an SD card module and is easy to use.

 

[Kryten]

Well Bill I dont know how to program Basic but its worth a try (i think)

 

[blueroomelectronics]

BASIC is not for everyone, but I personally find it easy and natural. The IDE is terrific too, worth a look for sure.
Swordfish Wiki | SwordfishUser / SDFileSystemVersion browse
Here's the SDfilesystem wiki.

 

[Kryten]

Yes bill youre right its looks really greate

 

[blueroomelectronics]

I'd stick with the 18F4550 (has internal OSC) over the older 452 (you need to add an external OSC)
The 4550 will require a crystal if you want to use the USB though. 20MHz is a popular choice for it.

What are you trying to do with the 18F4550?

 

[Kryten]

Well i have posted it before but here goes:

Im going to use:
two allegro currentsensors - 18F4550 - RTC - SD card

The use is for an energymeter that loggs the amaout of power going in and out of a battery bank. I need to use the SDcard and make a txt file that has a tabel like "substance" (in the lack of a betther word?!?!?). The txt file should contain the time stampe and avrage measurements of the power

Get the idea?
Im using a 8 MHz crystal (with the PLL inside it should bre fine)