Andy Green wrote: > I think there is a bit of confusion here. "Standby" is a separate issue > that does not need battery backup on MSP430. IO_3V3 rail is up during > standby. MSP430 will be up during standby.
Not quite :-) PMU.Standby != Linux.suspend When we suspend, the CPU remains in PMU.Active, and all we do is switch off some of the regulators we don't need. This is your scenario where IO_3V3 is active. However, PMU.Standby really means "no power to the system". (You can change that to some extent by setting bits in STBYCTL1 and STBYCTL2, but we don't do that.) Here's the matrix of states as I understand things: PMU CPU Linux ------- ------- ------------ NoPower off off Save off off Standby off off Active SLEEP suspend Active IDLE on, CPU idle Active NORMAL on, CPU busy CPU.off means completely unpowered. In CPU.SLEEP, I/O and VDDalive are powered, core and PLLs aren't, (I'm too lazy to look up whether VDDmop is powered as well ;-) I guess it is.) CPU.NORMAL has all rails powered. - Werner
