When SM2..0 is 000, the SLEEP instruction will put the MCU into idle mode. In this mode, the CPU stops running, while the LCD controller, SPI, USART, analog comparator, ADC, USI, timer/counter, watchdog and interrupt system continue to work. This sleep mode only stops clkCPU and clkFLASH, while other clocks continue to work.
Internal and external interrupts such as timer overflow and USART transfer completion can wake up the MCU. If the MCU does not need to be woken up by the analog comparator interrupt, the power supply of the comparator can be cut off to reduce power consumption. The method is to set ACD of the analog comparator control and status register ACSR. If the ADC is enabled, a conversion will be automatically started after entering this mode.
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