I've been using the SAM4L XPLAINED PRO development board that has an ATSAM4LC4 chip on it for a new project. Now I'm ready to design the actual board, and I was wondering: I only use the USB (for USB Flash drive host, to read pendrive files using the FATFS code) and the SPI interface with DMA. Nothing else. And so, I've been looking into the ATSAM4LC2 chips and looks to me that they'll do the job just as good. They run at 48MHz, have 32k of RAM, have USB, SPI, DMA... they really differ on FLASH amount and I/O's, but I don't need more than what it has.
Well, I've compared those devices side by side for about 20 minutes, but I thought I'd come ask the pros before making this board: If I only need the USB & SPI+DMA, and no more than 64k of FLASH, can I use the 48-pin ATSAM4LC2 instead of the 100-pin ATSAM4LC4?