I believe the mainline tree has a few 8-bit cpus: Atmel AVR (8-bit RISC) Freescale 68HC12 (8-bit/16-bit CISC) Freescale 68HC11 (8-bit CISC) However, I /think/ that the AVR is the only one still in current gcc trees. There are also some out-of-tree ports that you might find on the net: LatticeMico8 6809 On 24/11/15 05:00, htio2 wrote: > Hi sorry to bother you again, is there any 8-bit cpu other than arv > that I can use as a reffrence ? >