ARM, RISC-V контроллеры

Это фича кортексов, в Reference мануале про это написано в главе 29.16.1 (RM0008v9) [quote] For this, the debugger host must first set some debug configuration registers to change the low-power mode behavior: ● In Sleep mode, DBG_SLEEP bit of DBGMCU_CR register must be previously set by the debugger. This will feed HCLK with the same clock that is provided to FCLK (system clock previously configured by the software). ● In STOP mode, the bit DBG_STOP must be previously set by the debugger. This will enable the internal RC oscillator clock to feed FCLK and HCLK in STOP mode. [/quote]