I'm trying to get an understanding of the 4 different set_power mode options in the LPC1518. Per UM10736 (V1.1) page 584:
/* set_power mode options */
#define PWR_DEFAULT 0
#define PWR_CPU_PERFORMANCE 1
#define PWR_EFFICIENCY 2
#define PWR_LOW_CURRENT 3
Section 184.108.40.206 seems to elude to this effecting only the M3 core. The LPCOpen documenation nor the rom_pwr_15xx.h file in the LPCOpen library code is of any help.
I do see about a 1.5 to 2 mA reduction in consumption at 24MHz core speed between PWR_LOW_CURRENT and PWR_DEFAULT. I would like to know what really is being effected. Are any peripherals or bus behaviors effected? Anyone have any experience with these settings? Is there better documentation on this somewhere?