Syscfg And Ri; Table 17. Syscfg Differences Between Stm32L1 Series And Stm32L4 Series - ST STM32L1 Series Application Note

Peripheral migration
4.8

SYSCFG and RI

The STM32L4 and STM32L1 Series implement almost the same feature on the SYSCFG.
The table below shows the differences.

Table 17. SYSCFG differences between STM32L1 Series and STM32L4 Series

SYSCFG/RI
TIM2/TIM3/TIM4's input captures 1,2,3
and four routing selections from
selectable I/Os
– Routing of internal reference voltage
VREFINT to selectable I/Os for all
packages
– Up to 40 external I/Os + 3 internal
RI features
nodes (internal reference voltage +
temperature sensor + V
measurement by VCOMP) can be used
for data acquisition purposes in
conjunction with the ADC interface
– Input and output routing of COMP1 and
COMP2
– Remapping memory areas.
SYSCFG – Configuring USB pull-up resistor
Features
– Managing the external interrupt line
connection to the GPIOs.
Configuration
Color key:
= Same feature, but specification change or enhancement
= Feature not available (NA)
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STM32L1 Series
and V
DD DD
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DocID027094 Rev 3
STM32L4 Series
The RI IO switches control used for the Touch Sense
application has been replaced by a dedicated
peripheral (TSC) in STM32L4 Series.
The remaining switches control (for ADC, COMP)
and internal interconnects are managed inside each
specific peripheral in STM32L4 Series. The overall
functionality is not equivalent.
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– Remapping memory areas.
– Managing the external interrupt line connection to
the GPIOs.
– Managing robustness feature.
– Setting SRAM2 write protection and software
erase.
– Configuring FPU interrupts.
– Enabling the firewall.
– Enabling /disabling I2C Fast-mode Plus driving
capability on some I/Os and voltage booster for
I/Os analog switches.
– Most registers from STM32L1 Series are identical
in STM32L4 Series. A few bits are different and
EXTI configuration may differ (number of GPIO is
different depending on product)
AN4612