I need a solution where the MCU draws less than 100uA with timers operating and digital outputs are kept in a high or low state. The simplest solution to this would seem to be to run the MCU in active mode at e.g. 32kHz. Is this possible, or will I need to run it at 1MHz and alternate between active mode and low power mode? If LPM is used, may outputs be kept high during LPM?