2.2.1 tinyAVR® Devices

  • ATtiny40 RAMDR register cannot be written from Microchip Studio's I/O view. Workaround: Write SRAM directly via the memory view.

  • Selecting ATtiny10 external clock in the simulator will cause Microchip Studio to hang (#9349)

  • PRR register of ATtiny25/45/85 does not work (#5584, it works with the other devices having PRR)

  • ATtiny25/45/85: Watchdog time-out too long (~64 times longer than it should be @1 MHz)

  • System clock prescaler not included in simulator models. Writing CLKPR will not affect the system clock. (All devices except ATtiny10/9/5/4, ATtiny20, and ATtiny40.)

  • CLKPR is not updated when debugging if the CKDIV8 fuse is programmed (#10515)