MCBSTM32EXL Keil, MCBSTM32EXL Datasheet - Page 57

• Manufacturer Part Number: MCBSTM32EXL
• Description: BOARD EVALUATION FOR STM32F103ZE
• Manufacturer: Keil

Specifications of MCBSTM32EXL

• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

RM0008
4.3
4.3.1
Low-power modes
By default, the microcontroller is in Run mode after a system or a power Reset. 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 STM32F10xxx devices feature three low-power modes:
●
●
●
In addition, the power consumption in Run mode can be reduce by one of the following
means:
●
●
Table 8.
Slowing down system clocks
In Run mode the speed of the system clocks (SYSCLK, HCLK, PCLK1, PCLK2) can be
reduced by programming the prescaler registers. These prescalers can also be used to slow
down peripherals before entering Sleep mode.
For more details refer to
Sleep
(Sleep now or
Sleep-on -
exit)
Stop
Standby
Mode name
Sleep mode (CPU clock off, all peripherals including Cortex-M3 core peripherals like
NVIC, SysTick, etc. are kept running)
Stop mode (all clocks are stopped)
Standby mode (1.8V domain powered-off)
Slowing down the system clocks
Gating the clocks to the APB and AHB peripherals when they are unused.
Low-power mode summary
WFI
WFE
PDDS and LPDS
bits +
SLEEPDEEP bit
+ WFI or WFE
PDDS bit +
SLEEPDEEP bit
+ WFI or WFE
Entry
Section 6.3.2: Clock configuration register
Doc ID 13902 Rev 9
Any interrupt
Wakeup event
Any EXTI line
(configured in the
EXTI registers)
WKUP pin rising
edge, RTC alarm,
external reset in
NRST pin,
IWDG reset
wakeup
no effect on other
clocks or analog
clock sources
All 1.8V domain
clocks OFF
CPU clock OFF
domain clocks
Effect on 1.8V
(RCC_CFGR).
None
HSI and
HSE
oscillators
OFF
Effect on
domain
clocks
Power control (PWR)
V
DD
ON
ON or in low-
power mode
(depends on
Power control
register
(PWR_CR))
OFF
regulator
Voltage
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