Table 25. Aes Differences Between Stm32L1 Series And Stm32L4 Series - ST STM32L1 Series Application Note

Peripheral migration
4.16 AES
The STM32L4 Series implement several new features on the AES compared to STM32L1
Series.
The table below shows the differences.

Table 25. AES differences between STM32L1 Series and STM32L4 Series

AES
128-bit register for storing the encryption or
Features
derivation key (4x 32-bit registers).
Electronic codebook (ECB).
Cipher block chaining (CBC).
Counter mode (CTR).
Mode
Key length 128-bit
Configuration
Color key:
= New feature or new architecture (difference between STM32L1 and STM32L4 Series)
= Same feature, but specification change or enhancement
4.17 LCD
The STM32L4 Series LCD implements the same features than the STM32L1 Series except
for additional internal output buffers that allow to further improve contrast (it is possible to
use output buffers instead of high drive resistive network).
All programmable registers and associated bits in STM32L1 Series are equivalent in
STM32L4 Series. However, due to the fact that VLCD pin is implemented as alternate
function in STM32L4 Series (contrary to STM32L1 Series), a specific SW sequence is
required to configure the LCD when the step-up converter is used as power source.
Please refer to reference manuals for more details.
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STM32L1 Series
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DocID027094 Rev 3
STM32L4 Series
256-bit register for storing the encryption,
decryption or derivation key (8x 32-bit
registers).
Electronic codebook (ECB).
Cipher block chaining (CBC).
counter mode (CTR).
Galois counter mode (GCM).
Galois message authentication code mode
(GMAC).
Cipher message authentication code mode
(CMAC).
128-bit, 256-bit
All registers and programming bits in STM32L1
Series can be found in STM32L4 Series.
AN4612