Chip: At32UC3C2512, 64 pin. Any ideas how the get this chip into ISP mode? 64 pin version doesn't have a PA14 pin. Is there an alternative pin for 64QFP?
Download the AT32UC3C Data Sheet
On page 11 you find Table 3-1
Follow the first column down [QFN 64]
Pins associated with SPI are;
33, 39, 40, 41 etc, there are many other pins that can be used for SPI functions.
UC3 devices don't support ISP programming mode. Only JTAG and aWire.
Letting the smoke out since 1978
Then what is the ISP register at 0x808001FC for?
Where did you get that address? The peripheral registers start at 0xFFFD0000 and go up.
I think he is confused by reading the bootloader document? UC3 devices with an USB device interface ships with a pre-programmed USB bootloader, capable of programming the device.
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