Nuvoton NuMicro M031 Series User manual

NuMaker-M031TB
Feb. 20, 2019 Page 1of 36 Rev 1.00
NUMAKER-M031TB USER MANUAL
Maker Nu-mbed NUC472 User Manual
ARM®Cortex®-M
32-bit Microcontroller
NuMaker-M031TB
User Manual
NuMicro®M031 Series
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
1Overview.............................................................................................6
NuMaker-M031TB Features ......................................................................... 61.1
2NuMaker-M031TB Overview .....................................................................8
Front View............................................................................................... 82.1
Rear View............................................................................................... 92.2
Arduino UNO Compatible Extension Connectors................................................102.3
Pin Assignment for Extension Connectors........................................................12
2.4
System Configuration ................................................................................142.5
2.5.1 VIN Power Source............................................................................................ 14
2.5.2 5 V Power Sources ........................................................................................... 14
2.5.3 3.3 V Power Sources......................................................................................... 14
2.5.4 1.8 V Power Sources......................................................................................... 15
2.5.5 Power Connectors............................................................................................ 15
2.5.6 USB Connectors .............................................................................................. 15
2.5.7 Power Switches............................................................................................... 15
2.5.8 Power Supply Models........................................................................................ 16
2.5.9 Ammeter Connector.......................................................................................... 19
2.5.10 Extension Connectors........................................................................................ 19
2.5.11 Push-Buttons .................................................................................................. 19
2.5.12 LEDs............................................................................................................ 20
Nu-Link2-Me...........................................................................................202.6
PCB Placement .......................................................................................212.7
3Quick Start ........................................................................................ 22
Toolchains Supporting ...............................................................................223.1
Nuvoton Nu-Link Driver Installation................................................................223.2
BSP Firmware Download............................................................................243.3
Hardware Setup.......................................................................................243.4
Find the Example Project............................................................................263.5
Execute the Project under Toolchains.............................................................263.6
3.6.1 Keil MDK ....................................................................................................... 26
3.6.2 IAR EWARM................................................................................................... 30
3.6.3 NuEclipse ...................................................................................................... 31
4NuMaker-M031TB Schematics ................................................................ 32

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Nu-Link2-Me...........................................................................................324.1
M031 Platform.........................................................................................334.2
Extension Connector.................................................................................344.3
5REVISION HISTORY............................................................................ 35

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List of Figures
Figure 1-1 NuMaker-M031TB Board................................................................................................ 6
Figure 2-1 Front View of NuMaker-M031TB.................................................................................... 8
Figure 2-2 Rear View of NuMaker-M031TB..................................................................................... 9
Figure 2-3 Arduino UNO Compatible Extension Connectors......................................................... 10
Figure 2-4 M031TB0AE Extension Connectors............................................................................. 12
Figure 2-5 External Power Supply Sources on Nu-Link2-Me ........................................................ 16
Figure 2-6 External Power Supply Sources on M031 Platform ..................................................... 17
Figure 2-7 Separate the Nu-Link2-Me from NuMaker-M031TB..................................................... 18
Figure 2-8 Wiring between Ammeter Connector and Ammeter..................................................... 19
Figure 2-9 Front Placement ........................................................................................................... 21
Figure 2-10 Rear Placement.......................................................................................................... 21
Figure 3-1 Nu-Link USB Driver Installation Setup.......................................................................... 22
Figure 3-2 Nu-Link USB Driver Installation.................................................................................... 23
Figure 3-3 Open VCOM Function .................................................................................................. 24
Figure 3-4 ICE USB Connector...................................................................................................... 24
Figure 3-5 Device Manger.............................................................................................................. 25
Figure 3-6 PuTTY Session Setting................................................................................................. 25
Figure 3-7 Template Project Folder Path....................................................................................... 26
Figure 3-8 Warning Message of “Device not found” ...................................................................... 26
Figure 3-9 Project File Migrate to Version 5 Format...................................................................... 27
Figure 3-10 Debugger Setting in Options Window......................................................................... 27
Figure 3-11 Programming Setting in Options Window................................................................... 28
Figure 3-12 Compile and Download the Project............................................................................ 28
Figure 3-13 Keil MDK Debug Mode............................................................................................... 29
Figure 3-14 Debug Message on Serial Port Terminal Windows.................................................... 29
Figure 3-15 IAR EWARM Window................................................................................................. 30
Figure 3-16 Compile and Download the Project............................................................................ 30
Figure 3-17 IAR EWARM Debug Mode ......................................................................................... 31
Figure 3-18 Debug Message on Serial Port Terminal Windows.................................................... 31
Figure 4-1 Nu-Link2-Me Circuit...................................................................................................... 32
Figure 4-2 M031 Platform Circuit................................................................................................... 33
Figure 4-3 Extension Connectors Circuit ....................................................................................... 34

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List of Tables
Table 2-1 Arduino UNO Extension Connectors and M031TB0AE Mapping GPIO List................. 11
Table 2-2 M031TB0AE Full-pin Extension Connectors and GPIO Function List........................... 13
Table 2-3 Vin Power Source.......................................................................................................... 14
Table 2-4 5V Power Sources......................................................................................................... 14
Table 2-5 3.3 V Power Sources..................................................................................................... 14
Table 2-6 1.8 V Power Sources..................................................................................................... 15
Table 2-7 Power Connectors ......................................................................................................... 15
Table 2-8 USB Connectors ............................................................................................................ 15
Table 2-9 Power Switches ............................................................................................................. 15
Table 2-10 Supply External Power through Nu-Link2-Me ............................................................. 16
Table 2-11 Supply External Power for M031 platform................................................................... 18
Table 2-12 Ammeter Connector..................................................................................................... 19
Table 2-13 Extension Connectors.................................................................................................. 19
Table 2-14 Push-Buttons ............................................................................................................... 19
Table 2-15 LEDs ............................................................................................................................ 20
Table 2-16 VCOM Function of Nu-Link2-Me.................................................................................. 20

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1 OVERVIEW
This user manual is aimed to give users a fast introduction to the use of NuMaker-M031TB board.
The NuMaker-M031TB consists of two parts, a M031 platform and an on-board Nu-Link2-Me
debugger and programmer. The NuMaker-M031TB allows users to quickly develop and easily
program and debug application.
The NuMaker-M031TB offers M031TB0AE full pins extension connectors, Arduino UNO compatible
extension connectors and diversified power supply option. It is an easy-to-develop platform for user to
expand the functionality and build the applications. The NuMaker-M031TB also provides an ammeter
connector, allows user to monitor the microcontroller’s power consumption during development.
The Nu-Link2-Me is a debugger and programmer 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-M031TB, allowing user to use as a mass
production programming tool.
Figure 1-1 NuMaker-M031TB Board
NuMaker-M031TB Features1.1
NuMicro®M031TB0AE used as main microcontroller with function downward compatible
with:
M031TB0AE
M031EB0AE
M031FB0AE
M031TB0AE full pins extension connectors
Arduino UNO compatible extension connectors
Ammeter connector for measuring the microcontroller’s power consumption
Fixable board power supply:
External VDD power connector
Arduino UNO compatible extension connector Vin
USB power connector on M031 platform

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ICE USB connector on Nu-Link2-Me
On-board Nu-Link2-Me debugger and programmer:
Debug through SWD interface
On-line/off-line programming
Virtual COM port function

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2 NUMAKER-M031TB OVERVIEW
Front View2.1
ICE USB Connector
VCOM Switch
Reset Button
ICE Status LED
Off-line Program Button
USB Power Connector
Power LED
PB14 LED
VDD Switch
Target Chip: M031TB0AE Target Chip Extension Connector
Arduino UNO Compatible Extension Connector
External VDD Connector
Nu-Link2-Me
Ammeter
ICE Chip: M48SSIDAE
External VSS Connector
M031 Platform
Figure 2-1 Front View of NuMaker-M031TB
Figure 2-1 shows the main components and connectors from the front side of NuMaker-M031TB. The
following lists components and connectors from the front view:
Target Chip: M031TB0AE(U1)
USB Power Connector(J2)
Arduino UNO Compatible Extension Connectors (NU1, NU2, NU3, NU4)
M031 Extension Connectors (JP3, JP4, JP5 and JP6)
External VDD Power Connector(JP1)
External VSS Power Connector(JP2)
VDD Switch(SW2)
Ammeter Connector(AMMETER)
Reset Button(SW1)
Power LED and PB14 LED(LEDG1 and LEDR1)
Nu-Link2-Me
VCOM Switch
ICE Chip: M48SSIDAE(ICEU2)
ICE USB Connector(ICEJ3)
ICE Status LED(ICES0,ICES1, ICES2, ICES3)
Off-line Program Button(ICESW1)

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Rear View2.2
Figure 2-2 shows the main components and connectors from the rear side of NuMaker-M031TB.
The following lists components and connectors from the rear view:
Nu-Link2-Me
MCUVCC Power Switch (ICEJPR1)
ICEVCC Power Switch (ICEJPR2)
ICEVCC Power Switch
MCUVCC Power Switch
Figure 2-2 Rear View of NuMaker-M031TB

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Arduino UNO Compatible Extension Connectors2.3
Figure 2-3 shows the Arduino UNO compatible extension connectors.
NC D8
NC D9
SPI0_SS PWM0_CH2 PA.3 D10
SPI0_MOSI PWM0_CH5 PA.0 D11
SPI0_MISO PWM0_CH4 PA.1 D12
SPI0_CLK PWM0_CH3 PA.2 D13
VSS VSS
AVDD VREF
I2C0_SCL PC.0 SDA
I2C0_SDA PC.1 SCL
UART1_RXD PWM0_CH2 PB.2 D0
UART1_TXD PWM0_CH3 PB.3 D1
PA.12 D2
PA.13 D3
PA.14 D4
PA.15 D5
NC D6
NC D7
VIN
VSS
VSS
5V
3V
RST
IOREF VDD
NC
A5 PB.1 ADC0_CH1 I2C1_SCL UART2_TXD
A4 PB.0 ADC0_CH0 I2C1_SDA UART2_RXD
A3 PB.4 ADC0_CH4
A2 PB.5 ADC0_CH5
A1 PB.14 ADC0_CH14
A0 PB.15 ADC0_CH15
Figure 2-3 Arduino UNO Compatible Extension Connectors

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Header
NuMaker-M031TB
Header
NuMaker-M031TB
Compatible to
Arduino UNO
GPIO Pin of M031
Compatible to
Arduino UNO
GPIO Pin of M031
N
U
4
NU3.1
D0
PB.2
N
U
2
NU2.6
A5
PB.1
NU3.2
D1
PB.3
NU2.5
A4
PB.0
NU3.3
D2
PA.12
NU2.4
A3
PB.4
NU3.4
D3
PA.13
NU2.3
A2
PB.5
NU3.5
D4
PA.14
NU2.2
A1
PB.14
NU3.6
D5
PA.15
NU2.1
A0
PB.15
NU3.7
D6
NC
N
U
1
NU1.8
VIN
-
NU3.8
D7
NC
NU1.7
VSS
N
U
3
NU4.1
D8
NC
NU1.6
VSS
NU4.2
D9
NC
NU1.5
5V
NU4.3
D10
PA.3
NU1.4
3V
NU4.4
D11
PA.0
NU1.3
RST
nRESET
NU4.5
D12
PA.1
NU1.2
IOREF
VDD
NU4.6
D13
PA.2
NU1.1
NC
-
NU4.7
VSS
VSS
NU4.8
VREF
AVDD
NU4.9
SDA
PC.0
NU4.10
SCL
PC.1
Table 2-1 Arduino UNO Extension Connectors and M031TB0AE Mapping GPIO List

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Pin Assignment for Extension Connectors2.4
The NuMaker-M031TB provides the M031TB0AE target chip onboard and full pins extension
connectors (JP3, JP4, JP5 and JP6). The Figure 2-4 shows the M031TB0AE extension connectors.
JP3
Pin1 ~ Pin8
JP6
Pin25 ~ Pin32
JP5 Pin9 ~ Pin18
JP4 Pin19 ~ Pin24
Figure 2-4 M031TB0AE Extension Connectors

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Header
M031TB0AE
Pin No.
Function
JP3
JP3.1
JP3.2
1
PB.5/ADC0_CH5/I2C0_SCL/PWM0_CH0/UART2_TXD/TM0/INT0
JP3.3
JP3.4
2
PB.4/ADC0_CH4/I2C0_SDA/PWM0_CH1/UART2_RXD/TM1/INT1
JP3.5
JP3.6
3
PB.3/ADC0_CH3/I2C1_SCL/UART1_TXD/PWM0_CH2/PWM0_BRAKE0/INT2
JP3.7
JP3.8
4
PB.2/ADC0_CH2/I2C1_SDA/UART1_RXD/PWM0_CH3/INT3
JP3.9
JP3.10
5
PB.1/ADC0_CH1/UART2_TXD/I2C1_SCL/PWM0_CH4/PWM0_BRAKE0
JP3.11
JP3.12
6
PB.0/ADC0_CH0/UART2_RXD/SPI0_I2SMCLK/I2C1_SDA/PWM0_CH5/PWM0_BRAKE1
JP3.13
JP3.14
7
PF.5/UART2_RXD/UART2_nCTS/PWM0_CH0/ADC0_ST
JP3.15
JP3.16
8
PF.4/UART2_TXD/UART2_nRTS/PWM0_CH1
JP5
JP5.1
JP5.2
9
PF.3/UART0_TXD/I2C0_SCL/XT1_IN
JP5.3
JP5.4
10
PF.2/UART0_RXD/I2C0_SDA/XT1_OUT
JP5.5
JP5.6
11
PA.3/SPI0_SS/UART1_TXD/I2C1_SCL/PWM0_CH2/CLKO
JP5.7
JP5.8
12
PA.2/SPI0_CLK/UART1_RXD/I2C1_SDA/PWM0_CH3
JP5.9
JP5.10
13
PA.1/SPI0_MISO/UART0_TXD/UART1_nCTS/PWM0_CH4
JP5.11
JP5.12
14
PA.0/SPI0_MOSI/UART0_RXD/UART1_nRTS/PWM0_CH5
JP5.13
JP5.14
15
PF.15/PWM0_BRAKE0/PWM0_CH1/CLKO/INT4
JP5.15
JP5.16
16
nRESET
JP4
JP4.1
JP4.2
17
PF.0/UART1_TXD/I2C1_SCL/UART0_TXD/ICE_DAT
JP4.3
JP4.4
18
PF.1/UART1_RXD/I2C1_SDA/UART0_RXD/ICE_CLK
JP4.5
JP4.6
19
PC.1/UART2_TXD/I2C0_SCL
JP4.7
JP4.8
20
PC.0/UART2_RXD/I2C0_SDA
JP4.9
JP4.10
21
PA.12/I2C1_SCL
JP4.11
JP4.12
22
PA.13/I2C1_SDA
JP4.13
JP4.14
23
PA.14/UART0_TXD
JP4.15
JP4.16
24
PA.15/UART0_RXD
JP6
JP6.1
JP6.2
25
VSS
JP6.3
JP6.4
26
LDO_CAP
JP6.5
JP6.6
27
VDD
JP6.7
JP6.8
28
PB.15/ADC0_CH15/SPI0_SS/UART0_nCTS/TM0_EXT/PWM0_BRAKE1
JP6.9
JP6.10
29
PB.14/ADC0_CH14/SPI0_CLK/UART0_nRTS/TM1_EXT/CLKO
JP6.11
JP6.12
30
PB.13/ADC0_CH13/SPI0_MISO/UART0_TXD
JP6.13
JP6.14
31
PB.12/ADC0_CH12/SPI0_MOSI/UART0_RXD
JP6.15
JP6.16
32
AVDD
Table 2-2 M031TB0AE Full-pin Extension Connectors and GPIO Function List

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System Configuration2.5
2.5.1 VIN Power Source
Table 2-3 presents the Vin power source.
Connector
Net Name in
Schematic
Comment
NU1 pin8
NU1_VIN
Board external power source, with voltage range from 7
V to 12 V. The voltage regulator UP2 converts the NU1
pin8 input voltage to 5 V and supplies it to NuMaker-
M031TB.
Table 2-3 Vin Power Source
2.5.2 5 V Power Sources
Table 2-4 presents the 5 V power sources.
Connector
Net Name in
Schematic
Comment
ICEJ3
USB_HS_VBUS
ICE USB connector supplies 5 V power from PC to
M031 platform and Nu-Link2-Me.
J2
USB_VBUS
USB connector on NuMaker-M031TB supplies 5 V
power from PC to M031 platform and Nu-Link2-Me.
NU1 pin5
NU1_5VCC
ICEJ3, J2 or NU1 pin8 supplies 5 V power to NU1 pin5.
NU1 pin5 supplies 5 V power to target chip or Arduino
adapter board.
Note: M031 operating voltage range is from 1.8 V to 3.6
V. Do not switch SW2.1(NU1 5VCC) to ON.
Table 2-4 5V Power Sources
2.5.3 3.3 V Power Sources
Table 2-5 presents the 3.3 V power sources.
Voltage Regulator
5V Source
Comment
ICEUP1
USB_HS_VBUS
ICEUP1 converts USB_HS_VBUS to 3.3 V and supplies
3.3V to M031 platform or ICE chip.
UP1
USB_VBUS
UP1 converts USB_VBUS to 3.3 V and supplies 3.3 V
to M031 platform.
Note: SW2.2(NU1 3VCC) should be switched to ON.
UP1
NU1_5VCC
UP1 converts NU1_5VCC to 3.3 V and supplies 3.3 V to
M031 platform.
Note: SW2.2(NU1 3VCC) should be switched to ON.
Table 2-5 3.3 V Power Sources

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2.5.4 1.8 V Power Sources
Table 2-6 presents the 1.8 V power source.
Voltage Regular
5V Source
Comment
ICEUP2
USB_HS_VBUS
ICEUP2 converts USB_HS_VBUS to 1.8V and supplies
1.8V to M031 platform or ICE chip.
Table 2-6 1.8 V Power Sources
2.5.5 Power Connectors
Table 2-7 presents the power connectors.
Connector
Comment
JP1
VDD (1.8 V ~ 3.6 V) connector on the NuMaker-M031TB.
JP2
VSS connector on the NuMaker-M031TB.
Table 2-7 Power Connectors
2.5.6 USB Connectors
Table 2-8 presents the USB connectors.
Connector
Comment
ICEJ3
ICE USB connector on Nu-Link2-Me for power supply, debugging and
programming from PC.
J2
USB power connector on NuMaker-M031TB for power supply.
Table 2-8 USB Connectors
2.5.7 Power Switches
Table 2-9 presents the power switches.
Switch
Comment
ICEJPR1
Configures the target chip operating voltage at 1.8 V / 3.3 V / 5 V.
ICEJPR2
Configures the ICE chip operating voltage at 1.8 V / 3.3 V.
SW2
Configures the target chip operating voltage at 3.3 V / 5 V.
Table 2-9 Power Switches

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2.5.8 Power Supply Models
External Power Supply through Nu-Link2-Me to Target Chip2.5.8.1
The external power supply source on Nu-Link2-Me is shown in Figure 2-5.
ICE USB Connector (ICEJ3)
Nu-Link2-Me
Figure 2-5 External Power Supply Sources on Nu-Link2-Me
To use ICEJ3 as external power supply source with Nu-Link2-Me, please follow the below steps:
1. Solder the resistor on ICEJPR1 (MCUVCC) depends on the target chip operating voltage.
2. Solder the resistor on ICEJPR2 (ICEVCC) depends on the ICE chip operating voltage.
3. Switch the SW2 to OFF.
4. Connect the external power supply to JP1.
Table 2-10 presents all power models when supplies external power through Nu-Link2-Me. The Nu-
Link2-Me external power sources are highlighted in yellow.
Model
Target
Chip
Voltage
ICEJ3
ICEJPR1
(MCUVCC)
Selection [1]
ICEJPR2
(ICEVCC)
Selection [2]
ICE
Chip
Voltage
SW2
Selection
J2
Vin
JP1
1
1.8 V
Connect
to PC
1.8 V
1.8 V
1.8 V
Off
Ignore
Ignore
1.8 V
output
2
3.3 V
Connect
to PC
3.3 V (default)
3.3 V (default)
3.3 V
Off
Ignore
Ignore
3.3 V
output
3
5 V
Connect
to PC
5V
3.3 V (default)
3.3 V
Off
Ignore
Ignore
5 V
output
X: Unused.
Note:
1. 0 Ω should be soldered between ICEJPR1’s MCUVCC and 1.8 V / 3.3 V / 5 V.
2. 0 Ω should be soldered between ICEJPR2’s ICEVCC and 1.8 V / 3.3 V.
Table 2-10 Supply External Power through Nu-Link2-Me

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External Power Supply through M031 platform to Target Chip2.5.8.2
The external power supply sources on M031 platform are shown in Figure 2-6.
USB Power Connector (J2)
NU1 pin8 (Vin)
External VDD Connector (JP1)
External VSS Connector (JP2)
Figure 2-6 External Power Supply Sources on M031 Platform
To use Vin or J2 as external power supply source, please follow the below steps:
1. Switch the SW2 depends on the target chip operating voltage.
2. Remove the resistor on ICEJPR1 (MCUVCC).
3. Solder the resistor on ICEJPR2 (ICEVCC) depends on the ICE chip operating voltage.
4. Connect the external power supply to Vin or J2.
To use JP1 as external power supply source, please follow the below steps:
1. Switch the SW2 to OFF.
2. Remove the resistor on ICEJPR1 (MCUVCC).
3. Solder the resistor on ICEJPR2 (ICEVCC) depends on the ICE chip operating voltage.
4. Connect ICEJ3 to PC.
5. Connect the external power supply to JP1.
6.
To use Vin or J2 as external power supply source with Nu-Link2-Me separated from NuMaker-
M031TB, please follow the below steps:
1. Switch the SW2 depends on the target chip operating voltage.
2. Separate the Nu-Link2-Me from NuMaker- M031TB.
3. Connect the external power supply to Vin or J2.
To use JP1 as external power supply source with Nu-Link2-Me separated from NuMaker-M031TB,
please follow the below steps:
1. Switch the SW2 to OFF.
2. Separate the Nu-Link2-Me from NuMaker-M031TB.
3. Connect the external power supply to JP1.

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USB Power Connector (J2)
NU1 pin8 (Vin)
External VDD Connector (JP1)
External VSS Connector (JP2) Separate Nu-Link2-Me
"
"
Figure 2-7 Separate the Nu-Link2-Me from NuMaker-M031TB
Table 2-11 presents all power models when supplies external power through M031 platform. The
M031 platform external power sources are highlighted in yellow.
Model
Target Chip
Voltage
Vin [1]
J2
ICEJ3
SW2
Selection
JP1
ICEJPR1
(MCUVCC)
Selection [2]
ICEJPR2
(ICEVCC)
Selection [3]
ICE Chip
Voltage [4]
4
3.3 V
7 V ~ 12 V
Input
X
Ignore
NU1
3VCC
3.3 V output
Remove
resistor
3.3 V
3.3 V
5
3.3 V
X
Connect
to PC
Ignore
NU1
3VCC
3.3 V output
Remove
resistor
3.3 V
3.3 V
6
5 V
7 V ~ 12 V
Input
X
Ignore
NU1
5VCC
5 V output
Remove
resistor
3.3 V
3.3 V
7
5 V
X
Connect
to PC
Ignore
NU1
5VCC
5 V output
Remove
resistor
3.3 V
3.3 V
8
1.8 V ~ 3.6 V
Ignore [5]
Ignore [5]
Connect to
PC
OFF
DC Input
1.8 V ~ 3.6 V
Remove
resistor
1.8 V / 3.3 V
1.8 V / 3.3 V
9
1.8 V ~ 3.6 V
Ignore [5]
Ignore [5]
Nu-Link2-Me
removed
OFF
DC Input
1.8 V ~ 3.6 V
X
X
X
X: Unused.
Note:
1. The Vin input voltage will be converted by voltage regulator UP2 to 5 V.
2. 0Ω should be removed from ICEJPR1’s MCUVCC and 1.8 V / 3.3 V / 5 V.
3. 0Ω should be soldered between ICEJPR2’s ICEVCC and 1.8 V / 3.3 V.
4. The ICE chip voltage should be close to the target chip voltage.
5. JP1 external power input only provides voltage to target chip. Supply external power to Vin or J2 can provide
5V to NU1 pin5 (5V) and 3.3V to NU1 pin4 (3VCC).
Table 2-11 Supply External Power for M031 platform

NuMaker-M031TB
Feb. 20, 2019 Page 19 of 36 Rev 1.00
NUMAKER-M031TB USER MANUAL
Maker Nu-mbed NUC472 User Manual
2.5.9 Ammeter Connector
Table 2-12 presents the ammeter connector.
Connector
Comment
AMMETER
Connector for user to easily measure the target chip power consumption.
User needs to remove the R16 resistor.
Table 2-12 Ammeter Connector
USB Power Connector (J2)
NU1 pin8 (Vin)
External VDD Connector (JP1)
External VSS Connector (JP2) Separate Nu-Link2-Me
"
"
Figure 2-8 Wiring between Ammeter Connector and Ammeter
2.5.10 Extension Connectors
Table 2-13 presents the extension connectors.
Connector
Comment
JP3, JP4, JP5 and JP6
Full pins extension connectors on the NuMaker-M031TB.
NU1, NU2, NU3 and NU4
Arduino UNO compatible pins on the NuMaker-M031TB.
Table 2-13 Extension Connectors
2.5.11 Push-Buttons
Table 2-14 presents the push-buttons.
Component
Comment
ICESW1
Off-line program button to start off-line programming the target chip.
SW1
Reset button to reset the target chip.
Table 2-14 Push-Buttons

NuMaker-M031TB
Feb. 20, 2019 Page 20 of 36 Rev 1.00
NUMAKER-M031TB USER MANUAL
Maker Nu-mbed NUC472 User Manual
2.5.12 LEDs
Table 2-15 presents the LEDs.
Component
Comment
Power LED
The power LED indicates that the NuMaker-M031TB is powered.
PB14 LED
The LED is connected to the target chip PB.14.
ICES0, ICES1, ICES2
and ICES3
Nu-Link2-Me status LED.
Table 2-15 LEDs
Nu-Link2-Me2.6
The Nu-Link2-Me is a debugger and programmer that supports on-line programming and debugging
through SWD interface. The on-board 16 Mbit SPI Flash allows it to off-line program the target
microcontroller. Additionally, the Nu-Link2-Me provides virtual COM port (VCOM) function to print out
messages on PC. Table 2-16 presents how to set the VCOM function by ICESW2.
ICESW2
Pin
Function
Comment
1
TXD
On: Connect target chip PB.13 (UART0_TXD) to Nu-Link2-Me.
Off: Disconnect target chip PB.13 (UART0_TXD) to Nu-Link2-Me.
2
RXD
On: Connect target chip PB.12 (UART0_RXD) to Nu-Link2-Me.
Off: Disconnect target chip PB.12 (UART0_RXD) to Nu-Link2-Me.
Note: Pin 3 and 4 is unused.
Table 2-16 VCOM Function of Nu-Link2-Me