STMicroelectronics STM32F427 User Manual

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Contents STM32F42xx and STM32F43xx

2/36 DocID023833 Rev 5

Contents

1 ARM 32-bit Cortex-M4 with FPU limitations . . . . . . . . . . . . . . . . . . . . . . 7

1.1 Cortex-M4 interrupted loads to stack pointer can cause

erroneous behavior . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

2 STM32F42xx and STM32F43xx silicon limitations . . . . . . . . . . . . . . . . . 8

2.1 System limitations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

2.1.1 Debugging Stop mode and system tick timer . . . . . . . . . . . . . . . . . . . . 10

2.1.2 Debugging Stop mode with WFE entry . . . . . . . . . . . . . . . . . . . . . . . . . 10

2.1.3 Wakeup sequence from Standby mode when using more than

one wakeup source . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

2.1.4 Full JTAG configuration without NJTRST pin cannot be used . . . . . . . . 11

2.1.5 MPU attribute to RTC and IWDG registers could be managed

incorrectly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

2.1.6 Delay after an RCC peripheral clock enabling . . . . . . . . . . . . . . . . . . . . 12

2.1.7 Internal noise impacting the ADC accuracy . . . . . . . . . . . . . . . . . . . . . . 12

2.1.8 Over-drive and Under-drive modes unavailability . . . . . . . . . . . . . . . . . 13

2.2 IWDG peripheral limitation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

2.2.1 RVU and PVU flags are not reset in STOP mode . . . . . . . . . . . . . . . . . 13

2.3 I2C peripheral limitations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

2.3.1 SMBus standard not fully supported . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

2.3.2 Start cannot be generated after a misplaced Stop . . . . . . . . . . . . . . . . . 14

2.3.3 Mismatch on the “Setup time for a repeated Start condition” timing

parameter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

2.3.4 Data valid time (t

VD;DAT

) violated without the OVR flag being set . . . . . 14

2.3.5 Both SDA and SCL maximum rise time (t

) violated when VDD_I2C bus

higher than ((VDD+0.3) / 0.7) V . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15

2.4 I2S peripheral limitation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15

2.4.1 In I2S slave mode, WS level must be set by the external master

when enabling the I2S . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15

2.5 USART peripheral limitations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

2.5.1 Idle frame is not detected if receiver clock speed is deviated . . . . . . . . 16

2.5.2 In full duplex mode, the Parity Error (PE) flag can be cleared by

writing to the data register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

2.5.3 Parity Error (PE) flag is not set when receiving in Mute mode

using address mark detection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

2.5.4 Break frame is transmitted regardless of nCTS input line status . . . . . . 17

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STMicroelectronics STM32F427 Specifications

General

Series	STM32F4
Core	ARM Cortex-M4
Max Clock Speed	180 MHz
ADC Channels	Up to 24
ADC Resolution	12-bit
DAC Channels	2
DAC Resolution	12-bit
Timers	17
Communication Interfaces	I2C, SPI, UART, USB, CAN
Operating Voltage	1.8 V to 3.6 V
Operating Temperature	-40°C to 85°C
Package	LQFP100