The RTC clock is on a separate power domain and has 32 words of low-power SRAM. To save the maximum amount of power, the microcontroller power can be turned off altogether while keeping the RTC alive with some critical system information that can be saved between power cycles. This also eliminates leakage current power consumption. Each peripheral and the AHB matrix has a selectable Clock Enable bit. Therefore, the application can control which combinations of peripherals to enable for its particular system design and also when to enable them. Further, several peripherals have local power saving modes (such as sleep modes) available for more power savings. Additionally, the AHB clock can be divided to run at a lower frequency so that the entire matrix can run at a lower frequency.