Ah. SBI and CBI are 2-cycle instructions (I guess that makes sense, since they're read-modify-write), as is the jmp, so 2.66666 MHz is exactly as expected after all!
This implies that I can make a faster loop using OUT and pre-loaded registers...
Ah. SBI and CBI are 2-cycle instructions (I guess that makes sense, since they're read-modify-write), as is the jmp, so 2.66666 MHz is exactly as expected after all!
This implies that I can make a faster loop using OUT and pre-loaded registers...