Code space needed with MPASM??

[Jumper]

If you want to change from a 877A to something bigger you should consider the 18F4620 since it shares the pinout. Just plug that PIC in the same place as the 877A and adjust the code for the PIC registers and you are up and running. It doesnt hurt either that it has bigger codespace than the 4550 unless USB is the extra feature you are looking for then you have to go for the 4550.


/me

[BrianT]

Good suggestion Jumper however I work at an Australian university, all of which have suffered savage government funding cuts over the last ten years. I have 100 of the 18F4550 from another department available and the project cost is already too high. The PCBs have been ordered and the 4550 is pin for pin except RC3 which is not used in this design.

I intend to make the 4620 the 'standard' microcontroller here as I can then retrofit numerous projects with extra features and relax about tight memory for future projects.


Brian