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AN3422 Datasheet(PDF) 20 Page - STMicroelectronics

Part # AN3422
Description  Migration of microcontroller applications from STM32F1 to STM32L1 series
PDF  52 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

AN3422 Datasheet(HTML) 20 Page - STMicroelectronics

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Peripheral migration
AN3422
20/52
Doc ID 018976 Rev 2
In addition to the differences described in the table above, the following additional
adaptation steps may be needed for the migration:
1.
Performance versus VCORE ranges: The maximum system clock frequency and FLASH
wait state depends on the selected voltage range VCORE and also on VDD. The
following table gives the different clock source frequencies depending on the product
voltage range.
2.
System clock configuration: when moving from F1 series to L1 series only a few
settings need to be updated in the system clock configuration code; mainly the Flash
settings (configure the right wait states for the system frequency, prefetch
Internal
oscillator
measurement
/ calibration
– LSI connected to TIM5 CH4
IC: can measure LSI w/
respect to HSI/HSE clock
– LSI connected to TIM10
CH1 IC: can measure LSI
w/ respect to HSI/HSE
clock
– LSE connected to TIM10
CH1 IC: can measure LSE
w/ respect to HSI/HSE
clock
– HSE connected to TIM11
CH1 IC: can measure HSE
w/ respect to LSE/HSI
clock
– MSI connected to TIM11
CH1 IC: can measure MSI
range w/ respect to
HSI/HSE clock
There is no configuration to
perform in RCC registers.
Interrupt
– CSS (linked to NMI IRQ)
– LSIRDY, LSERDY, HSIRDY,
HSERDY, PLLRDY,
PLL2RDY and PLL3RDY
(linked to RCC global IRQ)
– CSS (linked to IRQ)
– LSIRDY, LSERDY,
MSIRDY, HSIRDY,
HSERDY and PLLRDY
(linked to RCC global IRQ)
No change to SW configuration:
interrupt enable, disable and
pending bits clear are done in
RCC_CIR register.
Table 5.
RCC differences between STM32F1 and STM32L1 series (continued)
RCC main
features
STM32F1 series
STM32L1 series
Comments
Table 6.
Performance versus VCORE ranges
CPU
performance
Power
performance
VCORE
range
Typical
Value (V)
Max frequency
(MHz)
VDD range
1 WS
0 WS
High
Low
1
1.8
32
16
2.0 - 3.6
Medium
Medium
2
1.5
16
8
1.65 - 3.6
Low
High
3
1.2
4
2



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