STMicroelectronics Discovery kit for STM32L151/152 line - with STM32L152RC MCU STM32L152C-DISCO STM32L152C-DISCO Hoja De Datos
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STM32L152C-DISCO
DocID022799 Rev 6
STM32L15xCC STM32L15xRC STM32L15xUC STM32L15xVC
Functional overview
51
Five BOR thresholds are available through option bytes, starting from 1.8 V to 3 V. To
reduce the power consumption in Stop mode, it is possible to automatically switch off the
internal reference voltage (V
reduce the power consumption in Stop mode, it is possible to automatically switch off the
internal reference voltage (V
REFINT
) in Stop mode. The device remains in reset mode when
V
DD
is below a specified threshold, V
POR/PDR
or V
BOR
, without the need for any external
reset circuit.
Note:
The start-up time at power-on is typically 3.3 ms when BOR is active at power-up, the start-
up time at power-on can be decreased down to 1 ms typically for devices with BOR inactive
at power-up.
up time at power-on can be decreased down to 1 ms typically for devices with BOR inactive
at power-up.
The device features an embedded programmable voltage detector (PVD) that monitors the
V
V
DD
/V
DDA
power supply and compares it to the V
PVD
threshold. This PVD offers 7 different
levels between 1.85 V and 3.05 V, chosen by software, with a step around 200 mV. An
interrupt can be generated when V
interrupt can be generated when V
DD
/V
DDA
drops below the V
PVD
threshold and/or when
V
DD
/V
DDA
is higher than the V
PVD
threshold. The interrupt service routine can then generate
a warning message and/or put the MCU into a safe state. The PVD is enabled by software.
3.3.3 Voltage
regulator
The regulator has three operation modes: main (MR), low power (LPR) and power down.
MR is used in Run mode (nominal regulation)
LPR is used in the Low power run, Low power sleep and Stop modes
Power down is used in Standby mode. The regulator output is high impedance, the
kernel circuitry is powered down, inducing zero consumption but the contents of the
registers and RAM are lost except for the standby circuitry (wakeup logic, IWDG, RTC,
LSI, LSE crystal 32K osc, RCC_CSR).
kernel circuitry is powered down, inducing zero consumption but the contents of the
registers and RAM are lost except for the standby circuitry (wakeup logic, IWDG, RTC,
LSI, LSE crystal 32K osc, RCC_CSR).
3.3.4 Boot
modes
At startup, boot pins are used to select one of three boot options:
Boot from Flash memory
Boot from System memory
Boot from embedded RAM
The boot loader is located in System memory. It is used to reprogram the Flash memory by
using USART1, USART2 or USB. See STM32™ microcontroller system memory boot mode
AN2606 for details.
using USART1, USART2 or USB. See STM32™ microcontroller system memory boot mode
AN2606 for details.