Q&A: What is the difference between Sleep Mode and Deep Sleep Mode?

Full question(s):

What are the differences and advantages for Sleep Mode and Deep Sleep Mode in the Apollo3 Blue?

Answer(s):

In Sleep Mode, the M4 is powered up, but the two clocks HCLK and FCLK are not active. The power supply
is still applied to the M4 logic such that it can immediately become active on a wake-up event and begin
executing instructions.

In Deep Sleep Mode, the main power of the M4 is removed, but the condition of the internal state is retained.  The clocks are not active, and the MCU clock sources for HCLK and FCLK can be deactivated. To facilitate the removal of the source supply and entry into Deep Sleep Mode, the M4 will handshake with the Wake-up Interrupt Controller and Power Management Unit and set up the possible wake-up conditions.  Greater than an order of magnitude less current draw can be achieved in Deep Sleep Mode compared to a similar configuration (SRAM, Flash, power domains) in Sleep Mode.