Nuvoton Nu-Link Series User manual

Nuvoton Nu-Link Debug Adapter User Manual
Oct 24, 2019 - 1 - Revision V1.01
Nuvoton Nu-Link
Debug Adapter User Manual
The information described in this document is the exclusive intellectual property of
Nuvoton Technology Corporation and shall not be reproduced without permission from Nuvoton.
Nuvoton is providing this document only for reference purposes of NuMicro microcontroller based system
design. Nuvoton assumes no responsibility for errors or omissions.
All data and specifications are subject to change without notice.
For additional information or questions, please contact: Nuvoton Technology Corporation.
www.nuvoton.com

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Table of Contents
1INTRODUCTION.............................................................................................................................. 3
2HARDWARE SPECIFICATIONS..................................................................................................... 4
2.1 Nu-Link-Pro ........................................................................................................................... 4
2.2 Nu-Link .................................................................................................................................. 5
2.3 Nu-Link-Me............................................................................................................................ 5
2.4 Nu-Link2-Me.......................................................................................................................... 6
2.5 Nu-Link Adapter Hardware Specifications ............................................................................ 7
3MAIN FUNCTIONS ........................................................................................................................ 10
3.1 Debugging ........................................................................................................................... 11
3.1.1 Debug Mode...................................................................................................................11
3.1.2 Breakpoints ....................................................................................................................11
3.1.3 Direct Register Control Interface ....................................................................................11
3.1.4 Semihost ........................................................................................................................13
3.2 Programming....................................................................................................................... 14
3.2.1 Online Programming.......................................................................................................14
3.2.2 Offline Programming.......................................................................................................14
3.2.3 Software Serial Number (SN).........................................................................................15
3.3 Wide Voltage Programming ................................................................................................ 16
3.4 Installing the Nu-Link Adapter Driver................................................................................... 16
4INSTALLATION AND SETUP........................................................................................................ 17
4.1 Connecting to the Nu-Link Adapter..................................................................................... 17
4.2 Software Setup.................................................................................................................... 18
4.2.1 ICP Tool .........................................................................................................................18
4.2.2 Keil MDK ........................................................................................................................21
4.2.3 IAR EWARM...................................................................................................................24
4.2.4 NuEclipse GCC ..............................................................................................................28
5+APPENDIX................................................................................................................................... 31
5.1 Nu-Link Adapter Operating Current..................................................................................... 31
5.2 Automatic IC Programming System .................................................................................... 31
5.2.1 Waveform........................................................................................................................32
6REVISION HISTORY..................................................................................................................... 33

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1 Introduction
Nuvoton’s Nu-Link Debug Adapter is an USB debugger and programmer based on the SWD (Serial
Wire Debug) signal interface and can be applied to the development of Nuvoton NuMicro®Family
chips. As shown in Table 2-1, there are four types of the Nu-Link Debug Adapter in accordance with
different specifications, including Nu-Link-Pro, Nu-Link, Nu-Link-Me and Nu-Link2-Me. The four types
are called “Nu-Link Adapter” in general if no specific conditions are mentioned.
The Nu-Link Adapter supports ICP (In-Circuit Programming) based on the SWD (Serial Wire Debug)
signal interface. The user can employ the NuMicro®ICP Programming Tool to update chip firmware
for mass production. The Nu-Link Adapter also supports the third-party development tools, such as
Keil MDK, IAR EWARM, and NuEclipse GCC.
For simplicity and clarity, parts of specific terms in this user manual are contracted or abbreviated, as
listed in the following table.
Short Name
Full Name
Nu-Link Adapter
Nuvoton Nu-Link Debug Adapter
NuMicro®Family
Nuvoton NuMicro®Family
ICP Tool
Nuvoton NuMicro®ICP Programming Tool
Keil MDK
Keil ARM RealView Microcontroller Development Kit (MDK-ARM® )
IAR EWARM
IAR Embedded Workbench for ARM
NuEclipse GCC
NuEclipse Integrated Development Environment
SWD
Serial Wire Debug
ICP
In-Circuit Programming

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2 Hardware Specifications
The Nu-Link Adapter provides an USB connector and a SWD signal interface for connecting to the
target chip. The user can connect the Nu-Link Adapter to an USB port of a PC to debug and program
target chips through the development software tools. As shown in Table 2-1, there are three
specifications for the Nu-Link Adapter, in which debugging, Online/Offline Programming, and SWD I/O
voltage settings may be supported depending on the specifications (refer to the +Appendix for details).
Table 2-1 Nu-Link Adapter Function Comparison
Type
Function
Nu-Link-Pro
Nu-Link
Nu-Link-Me
Nu-Link2-Me
Debugging
✔
✔
✔
✔
Online
Programming
✔
✔
✔
✔
Offline
Programming
✔
✔
✔
Multi SWD I/O
Voltage
✔
✔*1
✔*2
SWD I/O
Voltage Support
1.8V, 2.5V, 3.3V,
5.0V
5.0V
3.3V (default),
5.0V
1.8V, 3.3V
(default) , 5.0V(*3)
Control Bus*4
✔
Virtual COM
✔*5
✔
*1 Adjusted by resistor JPR1.
*2Adjusted by resistor ICEJPR1.
*3 The input supports 1.8V~5V, and the output only supports 1.8V~3.3V.
*4 The Nu-Link2-Me can be connected to a automatic IC programming system through the control bus.
Control Bus for IC Programmer(Start, Busy, Pass, Fail) .
*5 Virtual COM is supported in versions later than V3.0.
2.1 Nu-Link-Pro
The Nu-Link-Pro is a full-functional debugger and programmer with debugging, online/offline
programming, and SWD I/O voltage setting functions. As shown in Figure 2-1, the Nu-Link-Pro
includes an USB port that can be connected to a computer host, a set of Status LEDs, an offline
programming button, a SWD port that can be connected to a target chip for debugging and
programming (the voltage level of the SWD port can be adjusted through software as 1.8V, 2.5V,
3.3V, or 5.0V), a set of SWD I/O voltage LEDs and SWD Power Output LEDs.

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SWD
USB
Offline Programming Button SWD Power Output LED
SWD I/O Voltage LED
(1.8V / 2.5V / 3.3V / 5.0V) Status LED
(ICE / ICP / Red / Green)
NC
NC
NC
NC
NC
ICE_DAT
ICE_CLK
/RESET
VSS(GND)
VCC
Figure 2-1 Nu-Link-Pro Configuration
2.2 Nu-Link
The Nu-Link is a basic debugger and programmer with debugging and online/offline programming
functions. As shown in Figure 2-2, the Nu-Link includes an USB port that can be connected to a
computer host, a set of Status LEDs, an offline programming button, and a SWD port that can be
connected to a target chip for debugging and programming (the default voltage of the SWD port as
5.0V).
SWD
USB
Offline Programming Button
Green
Red
ICP
ICE
Status LED
Figure 2-2 Nu-Link Configuration
2.3 Nu-Link-Me
The Nu-Link-Me is a simple debugger and programmer with debugging and online programming
functions, which is only shipped with the NuTiny-SDK kits and can be used stand-alone for developing
the customized NuMicro®Family system.As shown in Figure 2-3, the Nu-Link-Me includes an USB
port that can be connected to a computer host, a set of Status LEDs, a Power Switch to switch the
voltage of Nu-Link-Me between 3.3V and 5.0V (the default as 3.3V), a SWD port that can be
connected to a target chip for debugging and programming (whose voltage is adjustable with the Nu-
Link-Me).

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SWD
USB
Status LED
(ICE / ICP / Red / Green)
Virtual COM Switch
ICE_DAT
ICE_CLK
/RESET
VSS(GND)
VCC
ICE_TX
ICE_RX
Figure 2-3 Nu-Link-Me Configuration
2.4 Nu-Link2-Me
The Nu-Link2-Me is a simple debugger and programmer with debugging and online programming
functions, which is only shipped with the Nu-Maker kits and can be used stand-alone for developing
the customized NuMicro®Family system,that supports on-line programming and debugging through
SWD interface. The on-board 16 Mbit SPI Flash allows it able to off-line programming the target
microcontroller. Nu-Link2-Me provides virtual COM port (VCOM) function to print out messages on
PC. Nu-Link2-Me can be separated from NuMaker, allowing user to use as a mass production
programming tool. Figure 2-4 shows the main components and connectors from the front side and
Figure 2-5 from the rear side of Nu-Link2-Me.
Figure 2-4 Front View of Nu-Link2-Me Configuration
SWD
USB
Status LED
(ICE / ICP / Red / Green)
VIrtual COM Switch
ICE SW
ICE_DAT
ICE_CLK
/RESET
VSS(GND)
VCC BUSY
START
ICE_RX/Pass
ICE_TX/Fail

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MCUVCC
Power Switch
ICEVCC
Power Switch
Figure 2-5 Rear View of Nu-Link2-Me Configuration
2.5 Nu-Link Adapter Hardware Specifications
The Nu-Link Adapter hardware comparison is shown in Table 2-2.
Table 2-2 Nu-Link Adapter Hardware Comparison
Device
Description
Nu-Link-Pro
Nu-Link
Nu-Link-Me
Nu-Link2-Me
USB
Connected to an USB port of a PC to use
the Nu-Link Adapter or download offline
programming firmware
✔
✔
✔
✔
SWD
Connected to the target chip for
debugging and programming
✔
✔
✔
✔
Status LED
Display the operation status of the Nu-
Link Adapter
✔
✔
✔
✔
Offline Programming Button
Click this button to proceed with offline
programming
✔
✔
✔
SWD Power Output LED
Display the power output status of SWD
VCC pins
✔
SWD I/O Voltage LED
Display the SWD VCC and I/O voltage
✔
Power Switch
Power switch between the power output
of the Nu-Link-Me power (e.g. between
the SWD VCC and I/O pins)
✔*1
✔*2
*1Only supported in parts of the version( Support 5V and 3.3V can be adjusted through resistor JPR1).

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*2Nu-Link2-Me.
MCUVCC Power Switch (ICEJPR1)
ICEVCC Power Switch (ICEJPR2)
Table 2-3 SWD I/O Voltage LEDs and SWD Power Output LEDs Status List
Power Status
Target System Power
SWD Power Output
LED
SWD I/O Voltage LED
1.8V
2.5V
3.3V
5.0V
SWD port I/O and VCC voltage as 1.8V
-
On
On
-
-
-
SWD port I/O and VCC voltage as 2.5V
-
On
On
On
-
-
SWD port I/O and VCC voltage as 3.3V
-
On
On
On
On
-
SWD port I/O and VCC voltage as 5.0V
-
On
On
On
On
On
SWD port I/O voltage as 1.8V
✔(1.8V)
-
On
-
-
-
SWD port I/O voltage as 2.5V
✔(2.5V)
-
On
On
-
-
SWD port I/O voltage as 3.3V
✔(3.3V)
-
On
On
On
-
SWD port I/O voltage as 5.0V
✔(5.0V)
-
On
On
On
On
Table 2-4 Status LEDs Difference List
Nu-Link Adapter Operation Status
Status LED
ICE
ICP
Red
Green
Boot
Flash×3
Flash×3
Flash×3
Flash×3
One Nu-Link Adapter selected to connect
Flash×4
Flash×4
Flash×4
On
ICE Online (Not connected with a target chip)
On
Any
-
-
ICE Online (Connected with a target chip)
On
Any
-
On
ICE Online (Failed to connect with a target chip)
On
Any
Flash
On
During Offline Programming
-
On
-
Flash
Slowly
Offline Programming Completed
On
-
-
-

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Offline Programming Completed (Auto mode)
On
On
-
-
Offline Programming Failed
On
Flash
-
-

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3 Main Functions
The Nu-Link Adapter provides complete debugging and programming functions for NuMicro®Family
and supports a number of third-party development tools. The detailed function support is listed in
Table 3-1.
Table 3-1Nu-Link Adapter Functions
Software
Function
ICP Tool
Keil
MDK
IAR
EWARM
NuEclipse
GCC
Debugging
✔
✔
✔
Breakpoints
✔
✔
✔
Direct Register Control Interface
✔
✔
✔*1
Semihost
✔
✔
✔
Online Programming
✔
✔
✔
✔
Offline Programming*2
✔
Software Serial Number
✔
Wide Voltage Programming*3
✔
✔
✔
Multi Nu-Link Adapter Support
✔
✔
✔
Nu-Link Adapter Driver Installation
✔
✔
*1 Core registers view is supported; peripherals view is not supported.
*2Supported for Nu-Link, Nu-Link-Pro and Nu-Link2-Me.
*3Supported for Nu-Link-Pro.

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3.1 Debugging
This section briefly describes the debugging function supported by the Nu-Link Adapter. For more
details, please refer to the related user manuals.
3.1.1 Debug Mode
The Nu-Link Adapter supports debugging for the NuMicro®Family chips based on the SWD signal
interface. The third-party tools that support using the Nu-Link Adapter for chip debugging include Keil
MDK, IAR EWARM, and NuEclipse GCC. Some more functions supported in Debug mode are
described as follows.
3.1.2 Breakpoints
In Debug mode, the user can add breakpoints in the code for debugging. During the real-time
simulation of the Nu-Link Adapter, the chip simulation will be stopped at a specific breakpoint. Figure
3-1 shows the breakpoint settings in Keil MDK Debug mode. The red labels on lines 052 and 059
indicate the breakpoints inserted; the yellow arrow refers to the code to be executed next and shows
the register value of Program Counter (PC) (i.e. “R15(PC)=0x00000D04” in the Registers pane in
Figure 3-1).
Figure 3-1 Setting Breakpoints in Keil MDK Debug Mode
3.1.3 Direct Register Control Interface
The Direct Register Control Interface can be used to display the register content in a target chip and
manipulate the registers. Take Keil MDK Debug mode for example, invoke the Debug command and
select a register from the “function register list” (e.g. ADC, CAN, CLK, etc.) to open the Direct Register
Control Interface of the selected register, as shown in Figure 3-2.

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Figure 3-2 Direct Register Interface Control Related Options in Keil MDK Debug Mode
The Direct Register Control Interface for CLK is shown in the left part of Figure 3-3, where the left
column shows the register address, the middle column shows the register name, and the right column
shows the register value. The Direct Register Control Interface for PWRCON is shown in the right part
of the Figure 3-3, where the left column shows the function bit(s), the middle column shows the
function name, and the right column shows the function value.
Detailed Operation:
Double-clicking a “register value” will open the register control details, as shown in the right part of
Figure 3-3.
Moving the cursor over a “register name” or “control value” will show the tip. The “register value” or
“control value” can be modified directly. The Nu-Link Adapter will then modify the content of the target
chip.
Figure 3-3 Direct Register Control Interface in Keil MDK Debug Mode

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3.1.4 Semihost
When using the Semihost function, the message of the NuMicro®Family microcontroller can be output
through UART to the debug window by the Nu-Link Adapter. That is, the message is output without
the GPIO. Figure 3-4 shows the debug messages in the “UART #1” form, which are the messages
output by the Nu-Link Adapter.
Follow the steps below to use the Semihost (taking the Keil MDK and M031AE series as example).
Step 1: Modify the strings in the “startup_NUC1xx.s” as follows.
;SEMIHOSTED SETL {FALSE} ; Delete this line
;↓Modify
SEMIHOSTED SETL {TRUE} ; Add this line
Step 2: Modify the strings in the “system_NUC1xx.h” as follows.
//#define DEBUG_ENABLE_SEMIHOST // Delete this line
//↓Modify
#define DEBUG_ENABLE_SEMIHOST // Add this line
Step 3: Invoke Rebuild to rebuild a project and enter Debug mode.
Step 4: In Debug mode, invoke View →Serial Windows →UART #1, as shown in Figure 3-4.
Step 5: Press F5 to program the target chip, and the debug messages are output to the UART #1
form.
Figure 3-4 Semihost Options in Keil MDK Debug Mode

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3.2 Programming
This section will briefly describe the programming function supported by the Nu-Link Adapter. For
more details, please refer to the related user manuals.
3.2.1 Online Programming
Online Programming means that the Nu-Link Adapter can download the firmware of the NuMicro®
Family single chip to the target chip through software programs, as shown in Figure 3-5.
ComputerNu-Link AdapterTarget Board
SWD USB
NuMicro™ Family
NuMicro® Family
ICP Tool
Program
Figure 3-5 Online Programming Flow Diagram
3.2.2 Offline Programming
Offline Programming means that the Nu-Link Adapter can update the firmware of the NuMicro®Family
single chip directly without accessing software programs (as shown in Figure 3-6). Offline
programming is useful for mass production since the original code or firmware file does not need to be
delivered and only the Nu-Link Adapter is needed for mass production. In addition, the Nu-Link
Adapter supports “Limited Offline Programming,” which can effectively control the authorized number
of the firmware. For details, please refer to the ICP Tool User Manual.

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ComputerNu-Link AdapterTarget Board
SWD USB
NuMicro™ Family
Load Firmware
Offline Program
Create APROM, LDROM and DataFlash firmware
of Binary or HEX format files.
NuMicro® Family
ICP Tool
Figure 3-6 Offline Programming Flow Diagram
3.2.3 Software Serial Number (SN)
The Software Serial Number (SN) function provided by the ICP Tool enables users to specify the
value in the “Increase SN from” and “Write address in flash”fields for the target chip during
online/offline programming. Take the NUC140VE3CN chip for example, the user can specify a set of
“Increased Serial Number (SN)” and “Write Address” to any of APROM, LDROM, and Data Flash, and
the written Serial Number (SN) will be automatically incremented (as shown in Figure 3-7).
0x00000000
0x0001FFFF
0x00100000
0x00100FFF
DFBADR[31:0]
LDROM
Data Flash
Reserved
APROM
0x00014000 0x174A0000
LDROM
Data Flash
Reserved
APROM
0x174A0001
Chip 1 Chip 2
+1
Figure 3-7 Software Serial Number (SN) Settings

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3.3 Wide Voltage Programming
The Nu-Link-Pro supports the wide voltage programming function, by which the development software
tool can adjust the SWD port voltage as 1.8V, 2.5V, 3.3V, or 5.0V. As shown in Figure 4-2, the pins
that can be controlled include VCC, ICE_DAT, ICE_CLK, and /RESET.
Also, as shown in Figure 2-1, the Nu-Link-Pro provides a set of SWD I/O Voltage LEDs and SWD
Power Output LEDs for checking the SWD port voltage. Refer to Table 2-3 for more details about the
LED status,
The Nu-Link-Me supports the wide voltage programming function, by which the resistor JPR1 can
adjust the SWD port voltage as 3.3V or 5.0V. As shown in Figure 4-2, the pins that can be controlled
include VCC, ICE_DAT, ICE_CLK, /RESET, ICE_RX and ICE_TX.
The Nu-Link2-Me supports the wide voltage programming function, by which the resistor ICEJPR1 can
adjust the SWD port voltage as 1.8V, 3.3V or 5.0V. As shown in Figure 4-2, the pins that can be
controlled include VCC, ICE_DAT, ICE_CLK, /RESET, ICE_RX/PASS, ICE_TX/Fail, BUSY and
START.
3.4 Installing the Nu-Link Adapter Driver
The Nu-Link Adapter supports a variety of functions and third-party software tools (e.g. Keil MDK and
IAR EWARM). After the software programs are installed, the drivers are also required. You can use
the following links: Nu-Link Adapter Driver for Keil MDK and Nu-Link Adapter Driver for IAR EWARM
to install the latest version. For details about software setup, please refer to section 4.2.

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4 Installation and Setup
This chapter introduces how to connect the Nu-Link Adapter to a computer, and how to set the third-
party tool to use the Nu-Link Adapter as a debugger and a programmer.
4.1 Connecting to the Nu-Link Adapter
As shown in Figure 4-1, the Nu-Link Adapter is a bridge between an USB and the SWD interface, by
which software tools can debug and program the target chip through an USB. The user can plug the
Nu-Link Adapter into an USB port of a PC directly or connect using the USB connector.
Through a SWD port, the Nu-Link Adapter can supply power (1.8V, 2.5V, 3.3V, or 5.0V) to a target
circuit board. The maximum is 5V/500mA. Refer to Table 2-1 for detailed specifications.
ComputerNu-Link AdapterTarget Board
SWD USB
NuMicro™ Family
Figure 4-1Nu-Link Adapter Connection Diagram
SWD Connector:
The SWD connector, which can be applied to all of the NuMicro®development tools and evaluation
boards, is a 100 mil (2×5) female header, as shown in the left of Figure 4-2.
VSS(GND)
/RESET
ICE_CLK
ICE_DAT
VCC
NC
NC
NC
NC
100 mil
SWD
(Female header)
VSS(GND)
/RESET
ICE_CLK
ICE_DAT
VCC
ICE_TX
ICE_RX
NC
NC
100 mil
SWD
(Female header)
VSS(GND)
/RESET
ICE_CLK
ICE_DAT
VCC
ICE_TX/FAIL
ICE_RX/PASS
START
BUSY
100 mil
SWD
(Female header)
Nu-Link-Pro Nu-Link-Me Nu-Link2-Me
Figure 4-2 SWD Connector Pin Diagrams

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4.2 Software Setup
This section briefly describes required software settings for connecting to the Nu-Link Adapter. For
detailed software operation, refer to the related user manuals.
4.2.1 ICP Tool
Step 1: Download and install Nuvoton NuMicro®ICP Programming Tool.
Step 2: Open the ICP Tool, specify the UI language and target chip, and then click Continue, as
shown in Figure 4-3.
Figure 4-3 Startup Screen of ICP Tool
Step 3: In the ICP Tool window, the connection status is shown as “Disconnected” since the ICP tool
has not been connected with the Nu-Link Adapter, as shown in Figure 4-4.
Figure 4-4 ICP Tool Main Window

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Step 4: Click Option in the Program section of the ICP Tool Window to open the Program Option
form, as shown in Figure 4-5.
Step 5: In the Nu-Link Pro IO Voltage section, specify the power voltage of the SWD port for the
target chip, and then click OK. To use the offline programming function, the Offline
Programming mode option needs to be selected, as shown in Figure 4-5.
Figure 4-5 ICP Tool Programming Options
Step 4: Return to the ICP Tool window, and then click the Connect button. Go to Step 5 if more than
two Nu-Link Adapters are connected with the host. Go to Step 6 if only one Nu-Link Adapter
is connected with the host.
Step 5: If two Nu-Link Adapters have been connected with the computer, a message appears and
asks to select one from the two adapters. Clicking OK will connect the selected adapter with
the host, as shown in Figure 4-6. When a Nu-Link Adapter is selected for connection, the
Status LED starts blinking. For the blinking details, refer to the Status LED description of the
“Select a Nu-Link Adapter to connect with the host” in Table 2-4.
Figure 4-6 Select One Nu-Link Adapter

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Step 6a: After the Connect button is clicked, the ICP Tool will be connected with the Nu-Link Adapter,
and a SWD port will be detected. Figure 4-7 shows that the ICP Tool has been connected
with the Nu-Link Adapter and a target chip is detected. At this time, the user can start
programming the target chip.
Figure 4-7 Nu-Link Adapter Connected with a Target Chip Detected
Step 6b: Figure 4-8 shows that the ICP Tool has been connected with the Nu-Link Adapter with no
target chip detected. The ICP tool will continue detecting the target chip until the Stop Check
button is clicked. At this time, the user cannot program any chip, but can use the offline
programming to save the offline programming information in the Nu-Link Adapter.
Figure 4-8 Nu-Link Adapter Connected with No Target Chip Detected
Step 7: Click the Disconnect button if programming is not needed (as shown in Figure 4-7). Or click
the Stop Check button to disconnect the ICP Tool with the Nu-Link Adapter and leave the
Nu-Link Adapter unused (as shown in Figure 4-8). As such, the Nu-Link Adapter can be
connected with another tool.