Low-Power Modes; Figure 11. Pvd Thresholds - ST STM32F40 Series Reference Manual

RM0090

Figure 11. PVD thresholds

PVD output
5.3

Low-power modes

By default, the microcontroller is in Run mode after a system or a power-on reset. In Run
mode the CPU is clocked by HCLK and the program code is executed. Several low-power
modes are available to save power when the CPU does not need to be kept running, for
example when waiting for an external event. It is up to the user to select the mode that gives
the best compromise between low-power consumption, short startup time and available
wakeup sources.
The devices feature three low-power modes:
●
Sleep mode (Cortex™-M4F core stopped, peripherals kept running)
●
Stop mode (all clocks are stopped)
●
Standby mode (1.2 V domain powered off)
In addition, the power consumption in Run mode can be reduce by one of the following
means:
●
Slowing down the system clocks
●
Gating the clocks to the APBx and AHBx peripherals when they are unused.
VDD
Doc ID 018909 Rev 4
PVD threshold
Power controller (PWR)
100 mV
hysteresis
MS30433V2
96/1422