delayMicroseconds() only correct @ 8MHz (ATtiny85)

[erniberni]

Hi,
I just found out that delayMicroseconds() produces only at 8 MHz clock correct values. When flashing the same code on an ATtiny85 with 1 MHz the us-delay is factor 8 too long. The function of delay() is in both cases correct.
Regards
Reinhard

[damellis]

This problems comes from the Arduino core, so I opened an issue for it there: arduino/Arduino#1181

[DaniDD]

No, not from core, you forgot to set the correct fuse byte in avrdude.
You must set it to 0x62 for 1MHz and 0xe2 for 8MHz

[damellis]

This has since been fixed in the Arduino core and delayMicroseconds() appears to work correctly at 1 MHz w/ Arduino 1.6.7 (AVR core 1.6.9) and possibly earlier: arduino/Arduino#1678