RM0367 Rev 7 255/1043
RM0367 System configuration controller (SYSCFG)
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10 System configuration controller (SYSCFG)
10.1 Introduction
The devices feature a set of configuration registers. The main purposes of the system
configuration controller are the following:
• Remapping memories
• Remapping some trigger sources to timer input capture channels
• Managing external interrupts line multiplexing to the internal edge detector
• Enabling dedicated functions such as input capture multiplexing or oscillator pin
remapping
• I2C Fm+ mode management
• LCD power rails decoupling
• Firewall management
• Temperature sensor and Internal voltage reference management (including for
Comparator, 48 MHz HSI and ADC purposes).
The Cortex
®
-M0+ can wake up from WFE (Wait For Event) when a transition occurs on the
eventin input signal. To support semaphore management in multiprocessor environment,
the core can also output events on the signal output EVENTOUT, during SEV instruction
execution.
In STM32L0x3 devices, an event input can be generated by an external interrupt line or by
an RTC alarm interrupt. It is also possible to select which output pin is connected to the
EVENTOUT signal of the Cortex
®
-M0+. The EVENTOUT multiplexing is managed by the
GPIO alternate function capability (see Section 9.4.9: GPIO alternate function low register
(GPIOx_AFRL) (x = A to E and H) and Section 9.4.10: GPIO alternate function high register
(GPIOx_AFRH) (x = A to E and H)).
Note: EVENTOUT is not mapped on all GPIOs (for example PC13, PC14, PC15).
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