Silicon Laboratories C8051F31 Series User manual

Rev. 0.7 2/14 Copyright © 2014 by Silicon Laboratories C8051F31x
C8051F31x
C8051F31XDEVELOPMENT KIT USER’SGUIDE
1. Kit Contents
The C8051F31x Development Kit contains the following items:
• C8051F310 Target Board
• C8051Fxxx Development Kit Quick-Start Guide
• AC to DC Power Adapter
• USB Debug Adapter (USB to Debug Interface)
• USB Cable
• CD-ROM
2. Hardware Setup Using a USB Debug Adapter
The target board is connected to a PC running the Silicon Laboratories IDE via the USB Debug Adapter as shown
in Figure 1.
1. Connect the USB Debug Adapter to the DEBUG connector on the target board with the 10-pin ribbon cable.
2. Connect one end of the USB cable to the USB connector on the USB Debug Adapter.
3. Connect the other end of the USB cable to a USB Port on the PC.
4. Connect the ac/dc power adapter to power jack P1 on the target board.
Notes:
• Use the Reset button in the IDE to reset the target when connected using a USB Debug Adapter.
• Remove power from the target board and the USB Debug Adapter before connecting or disconnecting the
ribbon cable from the target board. Connecting or disconnecting the cable when the devices have power can
damage the device and/or the USB Debug Adapter.
Figure 1. Hardware Setup Using a USB Debug Adapter
PC
USB
Cable
USB Debug Adapter
AC/DC
Adapter
Target Board
SILICON LABORATORIES
PWR
P1.6
P3.7RESET
Port 4Port 3Port 1
Port 2 Port 0
MCU
Silicon Laboratories
USB DEBUG ADAPTER
Run
StopPower

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3. Software Setup
Simplicity Studio greatly reduces development time and complexity with Silicon Labs EFM32 and 8051 MCU
products by providing a high-powered IDE, tools for hardware configuration, and links to helpful resources, all in
one place.
Once Simplicity Studio is installed, the application itself can be used to install additional software and
documentation components to aid in the development and evaluation process.
Figure 2. Simplicity Studio
The following Simplicity Studio components are required for the C8051F310 Development Kit:
8051 Products Part Support
Simplicity Developer Platform
Download and install Simplicity Studio from www.silabs.com/8bit-software or www.silabs.com/simplicity-studio.
Once installed, run Simplicity Studio by selecting StartSilicon LabsSimplicity StudioSimplicity Studio
from the start menu or clicking the Simplicity Studio shortcut on the desktop. Follow the instructions to install the
software and click Simplicity IDE to launch the IDE.
The first time the project creation wizard runs, the Setup Environment wizard will guide the user through the
process of configuring the build tools and SDK selection.
In the Part Selection step of the wizard, select from the list of installed parts only the parts to use during
development. Choosing parts and families in this step affects the displayed or filtered parts in the later device
selection menus. Choose the C8051F31x family by checking the C8051F31x check box. Modify the part selection
at any time by accessing the Part Management dialog from the WindowPreferencesSimplicity
StudioPart Management menu item.
Simplicity Studio can detect if certain toolchains are not activated. If the Licensing Helper is displayed after
completing the Setup Environment wizard, follow the instructions to activate the toolchain.

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3.1. Running Blinky
Each project has its own source files, target configuration, SDK configuration, and build configurations such as the
Debug and Release build configurations. The IDE can be used to manage multiple projects in a collection called a
workspace. Workspace settings are applied globally to all projects within the workspace. This can include settings
such as key bindings, window preferences, and code style and formatting options. Project actions, such as build
and debug are context sensitive. For example, the user must select a project in the Project Explorer view in order
to build that project.
To create a project based on the Blinky example:
1. Click the Simplicity IDE tile from the Simplicity Studio home screen.
2. Click the Create new project link from the welcome screen or go to FileNewSilicon Labs MCU
Project.
3. In the Kit drop-down, select C8051F310 Development Kit, in the Part drop-down, select C8051F310, and
in the SDK drop-down, select the desired SDK. Click Next.
4. Select Example and click Next.
5. Under C8051F310 Development Kit in the Blinky folder, select F31x Blinky and click Finish.
6. Click on the project in the Project Explorer and click Build, the hammer icon in the top bar. Alternatively,
go to ProjectBuild Project.
7. Click Debug to download the project to the hardware and start a debug session.
8. Press the Resume button to start the code running. The LED should blink.
9. Press the Suspend button to stop the code.
10. Press the Reset the device button to reset the target MCU.
11. Press the Disconnect button to return to the development perspective.
3.2. Simplicity Studio Help
Simplicity Studio includes detailed help information and device documentation within the tool. The help contains
descriptions for each dialog window. To view the documentation for a dialog, click the question mark icon in the
window:
This will open a pane specific to the dialog with additional details.
The documentation within the tool can also be viewed by going to HelpHelp Contents or HelpSearch.

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3.3. Legacy 8-bit IDE
Note: Using the Simplicity Studio tools with the C8051F310 Development Kit is recommended. See section 3. "Software
Setup‚" on page 2 for more information.
Download the 8-bit software from the website (www.silabs.com/8bit-software) or use the provided installer on the
CD-ROM to install the software tools for the C8051F31x devices. After installation, examples can be found in
...\Examples\C8051F31x in the installation directory. At a minimum, the C8051F310 DK requires:
Silicon Labs IDE—Software enabling initial evaluation, development, and debugging.
Configuration Wizard 2—Initialization code generation software for the C8051F31x devices.
Keil C51 Tools—Keil 8051 Compiler/Assembler/Linker toolchain.
Other software available includes:
Keil µVision Driver—Driver for the Keil µVision IDE that enables development and debugging on
C8051Fxxx MCUs.
Flash Programming Utilities and MCU Production Programmer—Programming utilities for the
production line. More information on the available programming options can be found on the website:
http://www.silabs.com/products/mcu/Pages/ProgrammingOptions.aspx.
ToolStick Development Tools—Software and examples for the ToolStick development platform. More
information on this platform can be found at www.silabs.com/toolstick.
The development kit includes the latest version of the C51 Keil 8051 toolset. This toolset is initially limited to a code
size of 2 kB and programs start at code address 0x0800. After registration, the code size limit is removed entirely
and programs will start at code address 0x0000.
To register the Keil toolset:
1. Find the Product Serial Number printed on the CD-ROM. If you no longer have this serial number,
register on the Silicon Labs website (www.silabs.com/8bit-software) to obtain the serial number.
2. Open the Keil µVision4 IDE from the installation directory with administrative privileges.
3. Select FileLicense Management to open the License Management window.
Figure 3. Keil µVision4 IDE License Management Window
4. Click on the Get LIC via Internet... button to open the Obtaining a License IDE Code (LIC) window.
5. Press OK to open a browser window to the Keil website. If the window doesn’t open, navigate to
www.keil.com/license/install.htm.
6. Enter the Silicon Labs Product Serial Number printed on the CD-ROM, along with any additional required

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Rev. 0.7 5
information.
7. Once the form is complete, click the Submit button. An email will be sent to the provided email address
with the license activation code.
8. Copy the License ID Code (LIC) from the email.
9. Paste the LIC into the New License ID Code (LIC) text box at the bottom of the License Management
window in µVision4.
10. Press the Add LIC button. The window should now list the PK51 Prof. Developers Kit for Silabs as a
licensed product.
11. Click the Close button.

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4. Target Board
The C8051F31x Development Kit includes a target board with a C8051F310 device pre-installed for evaluation and
preliminary software development. Numerous input/output (I/O) connections are provided to facilitate prototyping
using the target board. Refer to Figure 4 for the locations of the various I/O connectors.
P1 Power connector (accepts input from 7 to 15 VDC unregulated power adapter)
J1 34-pin Expansion I/O connector
J3 Port I/O Configuration connector
J4 DEBUG connector for Debug Adapter interface
J5 DB-9 connector for UART0 RS232 interface
J6 Analog I/O terminal block
J7 Low pass filter connector
J8 USB Debug Adapter target board power connector
J9, J10 External crystal enable connectors
Figure 4. C8051F310 Target Board
J7
PWR
Pin 1
Pin 2
DEBUG
Pin 1
P1
J5
Prototype Area
Pin 1
J6
C8051
F31X
Pin 2
Pin 1
Prototyping Area I/O Connection Points
RESET P0.7
P3.3
J10
J9
J8
J1
J3
J4

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4.1. System Clock Sources
The C8051F310 device installed on the target board features a calibrated programmable internal oscillator which is
enabled as the system clock source on reset. After reset, the internal oscillator operates at a frequency of
3.0625 MHz (±2%) by default but may be configured by software to operate at other frequencies. Therefore, in many
applications an external oscillator is not required. However, if you wish to operate the C8051F310 device at a fre-
quency not available with the internal oscillator, an external crystal may be used. Refer to the
C8051F31x data sheet
for more information on configuring the system clock source.
The target board is designed to facilitate the installation of an external crystal. Remove shorting blocks at headers
J9 and J10 and install the crystal at the pads marked Y1. Install a 10 Mresistor at R9 and install capacitors at
C14 and C15 using values appropriate for the crystal you select. Refer to the C8051F31x data sheet for more infor-
mation on the use of external oscillators.
4.2. Switches and LEDs
Two switches are provided on the target board. Switch SW1 is connected to the RESET pin of the C8051F310.
Pressing SW1 puts the device into its hardware-reset state. Switch SW2 is connected to the C8051F310’s general
purpose I/O (GPIO) pin through headers. Pressing SW2 generates a logic low signal on the port pin. Remove the
shorting block from the header to disconnect SW2 from the port pins. The port pin signal is also routed to a pin on
the J1 I/O connector. See Table 1 for the port pins and headers corresponding to each switch.
Two LEDs are also provided on the target board. The red LED labeled PWR is used to indicate a power connection
to the target board. The green LED labeled with a port pin name is connected to the C8051F310’s GPIO pin
through headers. Remove the shorting block from the header to disconnect the LED from the port pin. The port pin
signal is also routed to a pin on the J1 I/O connector. See Table 1 for the port pins and headers corresponding to
each LED.
Table 1. Target Board I/O Descriptions
Description I/O Header
SW1 Reset none
SW2 P0.7 J3[3-4]
Green LED P3.3 J3[1-2]
Red LED PWR none

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4.3. Expansion I/O Connector (J1)
The 34 -pin Expansion I/O connector J1 provides access to all signal pins of the C8051F 31 0 device. Pins for +3 V,
digital ground and the output of an on-board low-pass filter are also available. A small through-hole prototyping area
is also provided. All I/O signals routed to connector J1 are also routed to through-hole connection points between J1
and the prototyping area (see
Figure 4 on page 6 ). Each connection point is labeled indicating the signal available at
the connection point. See Table 2 for a list of pin descriptions for J1.
4.4. Target Board DEBUG Interface (J4)
The DEBUG connector (J4) provides access to the DEBUG (C2) pins of the C8051F310. It is used to connect the
Serial Adapter or the USB Debug Adapter to the target board for in-circuit debugging and Flash programming.
Table 3 shows the
DEBUG pin definitions.
Table 2. J1 Pin Descriptions
Pin # Description Pin # Description Pin # Description
1 +3VD(+3.3VDC) 13 P1.2 25 P2.6
2 PWM Output 14 P1.3 26 P2.7
3 P0.0 15 P1.4 27 P3.0
4 P0.1 16 P1.5 28 P3.1
5 P0.2 17 P1.6 29 P3.2
6 P0.3 18 P1.7 30 P3.3
7 P0.4 19 P2.0 31 P3.4
8 P0.5 20 P2.1 32 /RST (Reset)
9 P0.6 21 P2.2 33 GND (Ground)
10 P0.7 22 P2.3 34 GND (Ground)
11 P1.0 23 P2.4
12 P1.1 24 P2.5
Table 3. DEBUG Connector Pin Descriptions
Pin # Description
1 +3VD(+3.3VDC)
2, 3, 9 GND (Ground)
4C2D
5/RST(Reset)
6P3.0
7C2CK
8 Not Connected
10 USB Power

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4.5. Serial Interface (J5)
A RS232 transceiver circuit and DB-9 (J5) connector are provided on the target board to facilitate serial connec-
tions to UART0 of the C8051F310. The TX, RX, RTS and CTS signals of UART0 may be connected to the DB-9
connector and transceiver by installing shorting blocks on header J3.
J3[5–6]- Install shorting block to connect UART0 TX (P0.4) to transceiver.
J3[7–8]- Install shorting block to connect UART0 RX (P0.5) to transceiver.
J3[9–10]- Install shorting block to connect UART0 RTS (P3.1) to transceiver.
J3[11–12]- Install shorting block to connect UART0 CTS (P3.2) to transceiver.
4.6. Analog I/O (J6)
Several of the C8051F310 target device’s port pins are connected to the J6 terminal block. Refer to Table 4 for the
J6 terminal block connections. Install a shorting block on J7[2-3] to connect the AIN2.4 input to the P2.4 pin of the
target device.
4.7. USB Debug Adapter Target Board Power Connector (J8)
The USB Debug Adapter includes a connection to provide power to the target board. This connection is routed
from J4[10] to J8[1]. Place a shorting block at header J8[2–3] to power the board directly from an ac/dc power
adapter. Place a shorting block at header J8[1–2] to power the board from the USB Debug Adapter. Please note
that the second option is not supported with either the EC1 or EC2 Serial Adapters.
4.8. Low-Pass Filter (J7)
The C8051F310 target board features a low-pass filter that may be connected to port pin P2.4. Install a shorting
block on J7[1–2] to connect the P2.4 pin of the target device to the low-pass filter input. The output of the low-pass
filter is routed to the PWM signal at J1[2]. The C8051F310 may be programmed to generate a PWM (Pulse-Width
Modulated) waveform which is then input to the low-pass filter to implement a user-controlled PWM digital-to-ana-
log converter. Refer to Applications Note “AN107: Implementing 16-Bit PWM Using the PCA” in the “documenta-
tion” directory on the CD-ROM for a discussion on generating a programmable dc voltage level with a PWM
waveform and low-pass filter.
Table 4. J6 Terminal Block Pin Descriptions
Pin # Description
1 P2.5 / AIN2.5
2AIN2.4
3 GND (Ground)
4 P0.0 / Vref (Voltage Reference)

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5. Schematic
Figure 5. C8051F310 Target Board Schematic