ST 32F429IDISCOVERY User manual

July 2020 UM1670 Rev 4 1/32
1
UM1670
User manual
Discovery kit with STM32F429ZI MCU
Introduction
The 32F429IDISCOVERY Discovery kit allows users to easily develop applications with the
STMicroelectronics Arm®Cortex®-M4 core-based STM32F429 high-performance
microcontroller. It includes an ST-LINK/V2-B embedded debug tool, a 2.4" QVGA TFT LCD,
an external 64-Mbit SDRAM, an ST MEMS gyroscope, a USB OTG Micro-AB connector,
LEDs and push-buttons.
The board comes with the STM32 comprehensive free software libraries and examples
available with the STM32CubeF4 MCU Package, as well as direct access to the Arm®Mbed
Enabled™resources at the http://mbed.org website.
Figure 1. STM32F429 Discovery board
Picture is not contractual.
www.st.com

Contents UM1670
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Contents
1 Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
2 Ordering information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
2.1 Codification . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
3 Development environment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
3.1 System requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
3.2 Development toolchains . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
3.3 Demonstration software . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
4 Conventions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
5 Quick start . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
5.1 Getting started . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
6 Hardware layout . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
6.1 STM32F429 Discovery board layout . . . . . . . . . . . . . . . . . . . . . . . . . . . . .11
6.2 Mechanical drawing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
6.3 Embedded ST-LINK/V2-B . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
6.3.1 Drivers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
6.3.2 ST-LINK/V2-B firmware upgrade . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
6.3.3 VCP configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
6.3.4 Using ST-LINK/V2-B to program/debug
the STM32F429ZIT6 on board . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
6.3.5 Using ST-LINK/V2-B to program/debug
an external STM32 application . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
6.4 Power supply and power selection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
6.5 LEDs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
6.6 Push-buttons . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
6.7 USB OTG supported . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
6.8 Gyroscope MEMS (ST-MEMS I3G4250D) . . . . . . . . . . . . . . . . . . . . . . . . 19
6.9 TFT LCD (Thin-film-transistor liquid-crystal display) . . . . . . . . . . . . . . . . 19
6.10 64-Mbit SDRAM (1Mbit x 16-bit x 4-bank) . . . . . . . . . . . . . . . . . . . . . . . . 19
6.11 JP3 (Idd) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19

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UM1670 Contents
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6.12 OSC clock . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
6.12.1 OSC clock supply . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
6.12.2 OSC 32 kHz clock supply . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
6.13 Solder bridges . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
6.14 Extension connectors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
7 32F429IDISCOVERY information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
7.1 Product marking . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
7.2 Board revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
7.2.1 MB1075 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
7.3 Known limitations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
7.3.1 MB1075-F429 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
8 Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31

List of tables UM1670
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List of tables
Table 1. Ordering information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Table 2. Codification explanation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Table 3. ON/OFF conventions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Table 4. Jumper states . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Table 5. Debug connector CN2 (SWD) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Table 6. Solder bridges. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
Table 7. STM32 pin description versus board functions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
Table 8. Document revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31

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UM1670 List of figures
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List of figures
Figure 1. STM32F429 Discovery board . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
Figure 2. Hardware block diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Figure 3. Top layout . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Figure 4. Bottom layout . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Figure 5. STM32F429 Discovery board mechanical drawing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Figure 6. Updating the list of drivers in Device Manager . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Figure 7. STM32F429 Discovery board connections. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Figure 8. ST-LINK/V2-B connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17

Features UM1670
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1 Features
•STM32F429ZIT6 microcontroller featuring 2 Mbytes of Flash memory, 256 Kbytes of
RAM in an LQFP144 package
•2.4" QVGA TFT LCD
•USB OTG with Micro-AB connector
•I3G4250D, ST MEMS motion sensor 3-axis digital output gyroscope
•Six LEDs:
– LD1 (red/green) for USB communication
– LD2 (red) for 3.3 V power-on
– Two user LEDs: LD3 (green), LD4 (red)
– Two USB OTG LEDs: LD5 (green) VBUS and LD6 (red) OC (over-current)
•Two push-buttons (user and reset)
•64-Mbit SDRAM
•Extension header for LQFP144 I/Os for a quick connection to the prototyping board
and an easy probing
•On-board ST-LINK/V2-B
•USB functions:
– Debug port
– Virtual COM port
– Mass storage
•Mbed Enabled™ (see http://mbed.org)
•Board power supply: through the USB bus or from an external 5 V supply voltage
•Comprehensive free software including a variety of examples, part of STM32CubeF4
MCU Package or STSW-STM32138, for using legacy standard libraries

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UM1670 Ordering information
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2 Ordering information
To order the Discovery kit with the STM32F429ZI microcontroller, refer to Table 1. Additional
information is available from the datasheet and reference manual of the target
microcontroller.
2.1 Codification
The meaning of the codification is explained in Tabl e 2.
The order code is mentioned on a sticker placed on the top or bottom side of the board.
Table 1. Ordering information
Order code Board reference Target STM32
STM32F429I-DISC1(1)
1. Mbed Enabled™ STM32F429I-DISC1 with ST-LINK/V2-B replaces obsolete STM32F429I-DISCO with
ST-LINK/V2.
MB1075 STM32F429ZIT6
Table 2. Codification explanation
32XXYYZDISCOVERY Description Example: 32F429IDISCOVERY
32XX MCU series in STM32 32-bit Arm
Cortex MCUs STM32F4 Series
YY MCU product line in the series STM32F429
ZSTM32 Flash memory size:
– I for 2 Mbytes 2 Mbytes
DISCOVERY Discovery kit Discovery kit

Development environment UM1670
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3 Development environment
3.1 System requirements
•Windows® OS (7, 8 and 10), Linux® 64-bit or macOS®(a)
•USB Type-A to Mini-B cable
3.2 Development toolchains
•IAR Systems - IAR Embedded Workbench®(b)
•Keil®- MDK-ARM(b)
•STMicroelectronics - STM32CubeIDE
•Arm® Mbed™(c) online (see http://mbed.org)
3.3 Demonstration software
The demonstration software, included in the STM32Cube MCU Package corresponding to
the on-board microcontroller, is preloaded in the STM32 Flash memory for easy
demonstration of the device peripherals in standalone mode. The latest versions of the
demonstration source code and associated documentation can be downloaded from
www.st.com.
4 Conventions
Table 3 provides the definition of some conventions used in the present document.
a. macOS®is a trademark of Apple Inc. registered in the U.S. and other countries.
b. On Windows®only.
c. Arm and Mbed are registered trademarks or trademarks of Arm Limited (or its subsidiaries) in the US and
or elsewhere.
Table 3. ON/OFF conventions
Convention Definition
Jumper JPx ON Jumper fitted
Jumper JPx OFF Jumper not fitted
Solder bridge SBx ON SBx connections closed by solder
Solder bridge SBx OFF SBx connections left open

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5 Quick start
The STM32F429 Discovery is a low-cost and easy-to-use development kit to quickly
evaluate and start development with an STM32F4 microcontroller.
Before installing and using the product, accept the Evaluation Product License Agreement
from www.st.com/stm32f4-discovery.
For more information on the STM32F429 Discovery board and for demonstration software,
visit www.st.com/stm32f4-discovery.
5.1 Getting started
Follow the sequence below to configure the STM32F429 Discovery board and launch the
DISCOVER application:
1. Ensure that the jumpers JP3 and CN4 are set ON (Discovery mode).
2. Connect the STM32F429 Discovery board to a PC using a USB cable Type-A/Mini-B
through the USB ST-LINK connector CN1, to power the board, the LEDs LD2 (PWR)
and LD1 (COM).
3. The following applications are available on the screen:
– Clock/Calendar and Game
– Video Player and Image Browser (play videos and view images from the USB
mass storage connected to CN6)
– Performance monitor (watch the CPU load and run a graphical benchmark)
– System Info
4. The demonstration software, as well as other software examples, are available at the
www.st.com/stm32f4-discovery web page.
5. Develop applications starting from the examples.

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6 Hardware layout
The STM32F429 Discovery board has been designed around the STM32F429ZIT6
microcontroller in a 144-pin LQFP package.
Figure 2 illustrates the connections between the STM32F429ZIT6 and its peripherals
(ST-LINK/V2-B, push-buttons, LEDs, USB OTG, ST-MEMS gyroscope, accelerometer,
magnetometer, and connectors).
Figure 3 and Figure 4 show the location of these features on the STM32F429 Discovery
board.
Figure 5 shows the mechanical dimensions of the STM32F429 Discovery board.
Figure 2. Hardware block diagram
MSv32376V3
Embedded
ST-LINK/V2-B
STM32F429ZIT6
I/O I/O
I/O RESET
LEDs
LD3...LD6
SDRAM
64 Mbits
B2
RESET
B1
USER
I3G4250D
Micro USB
Mini USB
SWD
Header
Header
2.4" QVGA
TFT LCD
I2C ext

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6.1 STM32F429 Discovery board layout
Figure 3. Top layout
LD1
COM (red/green LED)
ST-LINK/V2-B
CN2
SWD connector
B1
user button
JP3
IDD measurement
LD3
(orange LED)
LD4
(green LED)
2.4" TFT LCD
B2
reset button
3 V power supply input/output
SB1
(B2 – RESET)
CN4
ST-LINK/DISCOVERY selector
LD2
PWR (red LED)

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Figure 4. Bottom layout
SB3, SB5, SB7, SB13
(RESERVED)
SB21
(BOOT1)
SB4, SB6, SB8, SB14
(DEFAULT)
SB19, SB20
(X3 crystal)
SB18
(MCO)
SB26, SB27
(USB OTG)
U5
STM32F429ZIT6
SDRAM
CN6
USB OTG Micro-AB
SB22, SB23, SB24, SB25
SB16, SB17
(X2 crystal)
SB9 (SWO)
SB15 (RX, TX)
SB10 (STM_RST)
SB11 (RX, TX)
SB12 (NRST)

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6.2 Mechanical drawing
Figure 5. STM32F429 Discovery board mechanical drawing

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6.3 Embedded ST-LINK/V2-B
The ST-LINK/V2-B on STM32F429I-DISC1 is embedded as a programming and debugging
tool. Virtual COM port and USB mass storage features are supported by the ST-LINK/V2-B
only for Mbed compatibility.
The ST-LINK/V2-B makes the STM32F4429I-DISC1 boards Mbed Enabled. The embedded
ST-LINK/V2-B supports only SWD for STM32 devices. For information about debugging and
programming features, refer to ST-LINK/V2 in-circuit debugger/programmer for STM8 and
STM32, User manual (UM1075), which describes in detail all the ST-LINK/V2 features.
The changes in ST-LINK/V2-B versus ST-LINK/V2 version are listed below.
New features supported on ST-LINK/V2-B are:
•Virtual COM port interface on USB
•Mass storage interface on USB
Features not supported on ST-LINK/V2-B are:
•SWIM interface
•Minimum supported application voltage limited to 3 V
•USB power management request for more than 100 mA power on USB
Known limitation:
•Activating the readout protection on the ST-LINK/V2-B target, prevents the target
application from running afterward. The target readout protection must be kept disabled
on the ST-LINK/V2-B boards.
There are two different ways to use the embedded ST-LINK/V2-B, depending on the jumper
states, as shown in Tabl e 4:
•Programming or debugging the STM32 on board. Refer to Section 6.3.4: Using ST-
LINK/V2-B to program/debug the STM32F429ZIT6 on board to program or debug the
STM32F429ZIT6 on-board.
•Programming or debugging the STM32 in an external application board, using a cable
connected to the SWD connector CN2. Refer to chapter Section 6.3.5: Using ST-
LINK/V2-B to program/debug an external STM32 application.
Table 4. Jumper states
Jumper state Description
Both CN4 jumpers ON ST-LINK/V2-B functions enabled for on-board programming (default)
Both CN4 jumpers OFF ST-LINK/V2-B functions enabled for application through external CN2
connector (SWD supported)

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6.3.1 Drivers
The ST-LINK/V2-B requires a dedicated USB driver, which, for Windows®7, 8, and 10 can
be found at the www.st.com website. In case the STM32 Discovery is connected to the PC
before the driver is installed, some Discovery interfaces may be declared as “Unknown” in
the PC device manager. In this case, the user must install the driver files (see Figure 6:
Updating the list of drivers in Device Manager) and update the driver of the connected
device from the device manager.
Note: Prefer using the “USB Composite Device” handle for a full recovery.
Figure 6. Updating the list of drivers in Device Manager
6.3.2 ST-LINK/V2-B firmware upgrade
The ST-LINK/V2-B embeds a firmware upgrade mechanism for the in-situ upgrade through
the USB port. As the firmware may evolve during the lifetime of the ST-LINK/V2-B product
(for example new functionalities, bug fixes, support for new microcontroller families), it is
recommended to visit the www.st.com website, before starting to use the Discovery board
and periodically, to stay up-to-date with the latest firmware version.
6.3.3 VCP configuration
The ST-LINK/V2-B on STM32F429I-DISC1 supports Virtual COM port (VCP) on U2 pin 12
(ST-LINK_TX) and U2 pin 13 (ST-LINK_RX), which are connected to the STM32F429 target
STM32 USART1 (PA9, PA10) for Mbed support, thanks to the SB11 and SB15 solder
bridges.
The SB11 (PA9) and SB15 (PA10) default configurations for 32F429IDISCOVERY and
STM32F429I-DISC1 are given in Table 6: Solder bridges.

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6.3.4 Using ST-LINK/V2-B to program/debug
the STM32F429ZIT6 on board
To program the STM32F429ZIT6 on board, simply plug in the two jumpers on CN4, as
shown marked in red in Figure 7, but do not use the CN2 connector as it could disturb the
communication with the STM32F429ZIT6 of the STM32F429 Discovery board.
Figure 7. STM32F429 Discovery board connections

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6.3.5 Using ST-LINK/V2-B to program/debug
an external STM32 application
It is very easy to use the ST-LINK/V2-B to program the STM32 on an external application.
Simply remove the two jumpers from CN4 as shown in Figure 8 and connect the application
to the CN2 debug connector according to Table 5.
Note: SB7 must be OFF if CN2 pin 5 is used in an external application.
Figure 8. ST-LINK/V2-B connections
Table 5. Debug connector CN2 (SWD)
Pin CN2 Designation
1 VDD_TARGET VDD from application
2 SWCLK SWD clock
3 GND Ground
4 SWDIO SWD data input/output
5 NRST RESET of target STM32
6 SWO Reserved

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6.4 Power supply and power selection
The power supply is provided either by the host PC through the USB cable or by an external
5V power supply.
The D1 and D2 diodes protect the 5 V and 3 V pins from external power supplies:
•5 V and 3 V can be used as output power supplies when another application board is
connected to pins P1 and P2.
In this case, the 5 V and 3 V pins deliver a 5 V or 3 V power supply and the power
consumption must be lower than 100 mA.
•5 V and 3 V can also be used as input power supply, e.g. when the USB connectors are
not connected to the PC.
In this case, the STM32F429 Discovery board must be powered by a power supply unit
or by auxiliary equipment complying with the standard EN-60950-1: 2006+A11/2009,
and must be Safety Extra Low Voltage (SELV) with limited power capability.
Note: The board can also be powered through the USB USER connector and it is protected by D4
and D5 diodes when both USBs are connected (in this case the 5 V power is around
4.4 volts).
6.5 LEDs
•LD1 COM:
The LD1 default status is red. LD1 turns to green to indicate that communications are in
progress between the PC and the ST-LINK/V2-B.
•LD2 PWR:
The red LED indicates that the board is powered.
•User LD3:
The green LED is a user LED connected to the I/O PG13 of the STM32F429ZIT6.
•User LD4:
The red LED is a user LED connected to the I/O PG14 of the STM32F429ZIT6.
•User LD5:
The green LED indicates when VBUS is present on CN6 and is connected to PB13 of
the STM32F429ZIT6.
•User LD6:
The red LED indicates an overcurrent from VBUS of CN6 and is connected to the I/O
PC5 of the STM32F429ZIT6.
6.6 Push-buttons
•B1 USER:
User and Wake-Up button connected to the I/O PA0 of the STM32F429ZIT6.
•B2 RESET:
The push-button connected to NRST is used to RESET the STM32F429ZIT6.

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6.7 USB OTG supported
The STM32F429ZIT6 drives USB OTG High-Speed through its internal PHY, which limits it
to USB OTG Full Speed on this board. The USB Micro-AB connector (CN6) allows the user
to connect a host or device component, such as a USB key, mouse, or other.
Two LEDs are dedicated to this module:
•LD5 (green LED) indicates when VBUS is active
•LD6 (red LED) indicates an overcurrent from a connected device
6.8 Gyroscope MEMS (ST-MEMS I3G4250D)
The I3G4250D is a low-power, three-axis angular rate sensor. It includes a sensing element
and an IC interface able to provide the measured angular rate to the external world through
the I2C/SPI serial interface.
The I3G4250D has a full-scale of ±245/±500/±2000 dps and is capable of measuring rates
with a user-selectable bandwidth.
The STM32F429ZIT6 controls this motion sensor through the SPI interface.
6.9 TFT LCD (Thin-film-transistor liquid-crystal display)
The TFT LCD is a 2.4" display of 262 K colors. Its definition is QVGA (240 x 320 dots) and is
directly driven by the STM32F429ZIT6 using the RGB protocol. It includes the ILI9341 LCD
controller and can operate with a typical 2.8 V voltage.
6.10 64-Mbit SDRAM (1Mbit x 16-bit x 4-bank)
The 64-Mbit SDRAM is a high-speed CMOS, dynamic random-access memory designed to
operate in 3.3 V memory systems containing 67,108,864 bits. It is internally configured as a
quad-bank DRAM with a synchronous interface. Each 16,777,216-bit bank is organized as
4,096 rows by 256 columns by 16 bits. The 64-Mbit SDRAM includes auto-refresh, power-
saving, and power-down modes. All signals are registered on the positive edge of the clock
signal, CLK.
The STM32F429ZIT6 reads and writes data at 80 MHz.
6.11 JP3 (Idd)
Jumper JP3, labeled Idd, allows the consumption of STM32F429ZIT6 to be measured by
removing the jumper and connecting an ammeter.
•Jumper ON: STM32F429ZIT6 is powered (default).
•Jumper OFF: an ammeter must be connected to measure the STM32F429ZIT6
current, (if there is no ammeter, the STM32F429ZIT6 is not powered).

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6.12 OSC clock
6.12.1 OSC clock supply
The following information indicates all configurations for clock supply selection.
•MCO from ST-LINK (from MCO of the STM32F429ZIT6)
This frequency cannot be changed, it is fixed at 8 MHz and connected to PH0-OSC_IN
of the STM32F429ZIT6. The configuration needed is:
– SB18 closed, SB19 open, R56 removed
– SB20, R57, C20, C21, X3 = do not care
•Oscillator on board (from X3 crystal)
For typical frequencies and its capacitors and resistors, refer to the STM32F429ZIT6
datasheet. The configuration needed is:
– SB18, SB19, SB20 open
– R56, R57, C20, C21, X3 soldered
•Oscillator from external PH0 (from external oscillator through pin 10 of the P2
connector)
The configuration needed is:
– SB19 closed, SB18 open, R56 removed
– SB20, R57, C20, C21, X3 = do not care
•No external oscillator (from internal oscillator HSI only).
PH0 and PH1 can be used as GPIO. The configuration needed is:
– SB18 open, SB19 closed, SB20 closed, R56 removed, R57 removed
– C20, C21, X3 = do not care
6.12.2 OSC 32 kHz clock supply
The following information indicates all configurations for the 32 kHz clock supply selection.
•Oscillator on board (from X2 Crystal, not provided).
The configuration needed is:
– SB16 open, SB17 open
– R53, R54, C23, C24, X2 soldered
•Oscillator from external PC14 (from external oscillator through pin 9 of P1 connector)
The configuration needed is:
– SB16 closed, R53 removed
– SB17, R54, C23, C24, X2 = do not care
•No external oscillator (PC14 and PC15 can be used as GPIO.
The configuration needed is:
– SB16 closed, SB17 closed, R53 removed, R54 removed
– C23, C24, X2 = do not care