I'm trying to use the ATtiny10's PB3 as ADC3. I notice that PB3 is at VCC level when not connected. I reset PUEB3 but it still is at Vcc. A little research (Table 10.4) shows PUOV is always set, so it overrides PUEB3. Since I have RESET DISABLED in the fuse bits, this pull up override enable (PUOE) should be 0 and PUOV should be a non-issue.
I'm trying to measure a voltage using an emitter follower, but the emitter gets pulled high by PB3. PB3 is my only choice for another ADC.
Any idea where my thinking is off?