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AN4660 Datasheet(PDF) 20 Page - STMicroelectronics

Part # AN4660
Description  Designers of STM32 microcontroller applications must have the possibility
PDF  27 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

AN4660 Datasheet(HTML) 20 Page - STMicroelectronics

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Peripheral migration
AN4660
20/27
DocID027558 Rev 2
2.12
I2C
The STM32F42xxx/F43xxx and STM32F74xxx/F75xxx share the same features on the I2C,
but the software and register configuration are not compatible.
Table 17 presents the I2C differences between STM32F42xxx/F43xxx and
STM32F74xxx/F75xxx.
2.13
SPI
The STM32F42xxx/F43xxx and STM32F74xxx/F75xxx implement different features on the
SPI.
Table 18 presents the SPI differences between STM32F42xxx/F43xxx and
STM32F74xxx/F75xxx.
Table 17. I2C differences between STM32F42xxx/F43xxx and STM32F74xxx/F75xxx
I2C
STM32F42xxx/F43xxx
STM32F74xxx/F75xxx
Instances
– x3 (I2C1, I2C2, I2C3)
– x4 (I2C1, I2C2, I2C3, I2C4)
Features
– 7-bit and 10-bit addressing mode
–SMBus
– Standard mode (up to 100 kbit/s)
– Fast mode (up to 400 kbit/s)
– Single clock source
– Programmable clock source
I2C registers
– Software not compatible.
Table 18. SPI differences between STM32F42xxx/F43xxx and
STM32F74xxx/F75xxx
SPI
STM32F42xxx/F43xxx
STM32F74xxx/F75xxx
Instances
x6
x4 | x6
Features
SPI + I2S
Data size
Fixed, configurable to 8 or 16
bits
Programmable from 4 to 16-bit
Data buffer
Tx & Rx 16-bit buffers
(single data frame)
Two 32-bit embedded Rx and Tx
FIFOs
(up to 4 data frames)
Data packing
No
(16-bit access only)
Yes
Mode
SPI TI mode
SPI Motorola mode
SPI TI
SPI Motorola mode
NSSP mode
Speed
up to 45Mbits/s
Up to 50Mbits/s (TBC)
SPI registers
Software not compatible



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