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In standby mode, the Cortex-M3 waits in deep-sleep for interrupts to wake up after executing the WFI
instruction. Before entering standby, power down system resources, including the high-frequency
oscillator, radio, peripherals, and auxiliary domain. Many system modules have retention in standby
including the Cortex-M3 (see the CC13x0, CC26x0 Technical Reference Manual for details). After waking
up from standby, the Cortex-M3 resumes executing programs at the point before entering standby.
