Nuvoton NuMicro M031 Series User manual

NuMaker-M031KG
May. 07, 2020 Page 1of 47 Rev 1.00
NUMAKER-M031KG USER MANUAL
Maker Nu-mbed NUC472 User Manual
ARM®Cortex®-M
32-bit Microcontroller
NuMaker-M031KG
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.............................................................................................7
2Features .............................................................................................8
3Hardware Configuration...........................................................................9
Front View............................................................................................... 93.1
Rear View..............................................................................................103.2
Extension Connectors................................................................................113.3
3.3.1 Pin Assignment for Extension Connectors................................................................ 11
3.3.2 Arduino UNO Compatible Extension Connectors ....................................................... 16
Power Supply Configuration ........................................................................183.4
3.4.1 VIN Power Source............................................................................................ 18
3.4.2 5 V Power Sources ........................................................................................... 18
3.4.3 3.3 V Power Sources......................................................................................... 19
3.4.4 1.8 V Power Sources......................................................................................... 19
3.4.5 Power Connectors............................................................................................ 19
3.4.6 USB Connectors .............................................................................................. 20
3.4.7 Power Switches............................................................................................... 20
3.4.8 Power Supply Models........................................................................................ 20
External Reference Voltage Connector ...........................................................233.5
Ammeter Connector..................................................................................233.6
Push Buttons ..........................................................................................243.7
LEDs....................................................................................................243.8
Nu-Link2-Me...........................................................................................243.9
3.9.1 VCOM Switches............................................................................................... 24
4Quick Start ........................................................................................ 26
Toolchains Supporting ...............................................................................264.1
Nuvoton Nu-Link Driver Installation................................................................264.2
BSP Firmware Download............................................................................284.3
Hardware Setup.......................................................................................284.4
Find the Example Project............................................................................304.5
Execute the Project under Toolchains.............................................................304.6
4.6.1 Keil MDK ....................................................................................................... 30
4.6.2 IAR EWARM................................................................................................... 34
4.6.3 NuEclipse ...................................................................................................... 36

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5NuMaker-M031KG Schematics................................................................ 42
Nu-Link2-Me...........................................................................................425.1
M031 platform.........................................................................................435.2
Extension Connector.................................................................................445.3
PCB Placement .......................................................................................455.4
6REVISION HISTORY............................................................................ 46

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List of Figures
Figure 1-1 NuMaker-M031KG Development Board......................................................................... 7
Figure 3-1 Front View of NuMaker-M031KG ................................................................................... 9
Figure 3-2 Rear View of NuMaker-M031KG.................................................................................. 10
Figure 3-3 M031KG8AE Extension Connectors ............................................................................ 11
Figure 3-4 Arduino UNO Compatible Extension Connectors......................................................... 16
Figure 3-5 External Power Supply Sources on Nu-Link2-Me ........................................................ 20
Figure 3-6 External Power Supply Sources on M031 platform...................................................... 21
Figure 3-7 Detach the Nu-Link2-Me from NuMaker-M031KG....................................................... 22
Figure 3-8 Wiring between Ammeter Connector and Ammeter..................................................... 24
Figure 4-1 Nu-Link USB Driver Installation Setup.......................................................................... 26
Figure 4-2 Nu-Link USB Driver Installation.................................................................................... 27
Figure 4-3 Open VCOM Function .................................................................................................. 28
Figure 4-4 ICE USB Connector...................................................................................................... 28
Figure 4-5 Device Manger.............................................................................................................. 29
Figure 4-6 PuTTY Session Setting................................................................................................. 29
Figure 4-7 Template Project Folder Path....................................................................................... 30
Figure 4-8 Warning Message of “Device not found” ...................................................................... 30
Figure 4-9 Project File Migrate to Version 5 Format...................................................................... 31
Figure 4-10 Debugger Setting in Options Window......................................................................... 31
Figure 4-11 Programming Setting in Options Window................................................................... 32
Figure 4-12 Compile and Download the Project............................................................................ 32
Figure 4-13 Keil MDK Debug Mode............................................................................................... 33
Figure 4-14 Debug Message on Serial Port Terminal Windows.................................................... 33
Figure 4-15 IAR EWARM Window................................................................................................. 34
Figure 4-16 Compile and Download the Project............................................................................ 34
Figure 4-17 IAR EWARM Debug Mode ......................................................................................... 35
Figure 4-18 Debug Message on Serial Port Terminal Windows.................................................... 35
Figure 4-19 Import the Project in NuEclipse.................................................................................. 36
Figure 4-20 Import Projects Windows............................................................................................ 36
Figure 4-21 Open Project Properties Window ............................................................................... 37
Figure 4-22 Project Properties Settings......................................................................................... 37
Figure 4-23 Build Project................................................................................................................ 38
Figure 4-24 Open Debug Configuration......................................................................................... 38
Figure 4-25 Main Tab Configuration .............................................................................................. 39
Figure 4-26 Debugger Tab Configuration ...................................................................................... 39
Figure 4-27 Startup Tab Configuration .......................................................................................... 40

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Figure 4-28 NuEclipse Debug Mode.............................................................................................. 41
Figure 4-29 Debug Message on Serial Port Terminal Windows.................................................... 41
Figure 5-1 Nu-Link2-Me Circuit...................................................................................................... 42
Figure 5-2 M031 platform Circuit.................................................................................................... 43
Figure 5-3 Extension Connectors Circuit....................................................................................... 44
Figure 5-4 Front Placement ........................................................................................................... 45
Figure 5-5 Rear Placement............................................................................................................ 45

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List of Tables
Table 3-1 Extension Connectors.................................................................................................... 11
Table 3-2 M031KG8AE Full-pin Extension Connectors and GPIO Function List.......................... 15
Table 3-3 Arduino UNO Extension Connectors and M031KG8AE Mapping GPIO List ................ 17
Table 3-4 Vin Power Source.......................................................................................................... 18
Table 3-5 5 V Power Sources........................................................................................................ 18
Table 3-6 3.3 V Power Sources..................................................................................................... 19
Table 3-7 1.8 V Power Sources..................................................................................................... 19
Table 3-8 Power Connectors ......................................................................................................... 19
Table 3-9 USB Connectors ............................................................................................................ 20
Table 3-10 Power Switches ........................................................................................................... 20
Table 3-11 Supply External Power through Nu-Link2-Me ............................................................. 21
Table 3-12 Supply External Power for M031 platform................................................................... 23
Table 3-13 External Reference Voltage Connector....................................................................... 23
Table 3-14 Ammeter Connector..................................................................................................... 23
Table 3-15 Push-Buttons ............................................................................................................... 24
Table 3-16 LEDs ............................................................................................................................ 24
Table 3-17 VCOM Function of Nu-Link2-Me.................................................................................. 25

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1 OVERVIEW
The NuMaker-M031KG is a development board for Nuvoton NuMicro®M031xG microcontrollers. The
NuMaker-M031KG consists of two parts: an M031 platform and an on-board Nu-Link2-Me debugger
and programmer. The NuMaker-M031KG is designed for project evaluation, prototype development
and validation with power consumption monitoring function.
The M031 platform is based on NuMicro®M031KG8AE. For the development flexibility, the M031
platform provides the extension connectors of M031KG8AE, the Arduino UNO compatible headers
and able to adopt multiple power supply. Furthermore, the Nuvoton-designed ammeter connector can
measure the power consumption instantly, which is essential for the prototype evaluation.
In addition to the M031 platform, there is an attached on-board debugger and programmer “Nu-Link2-
Me”. The Nu-Link2-Me supports on-chip debugging, online and offline ICP programming via SWD
interface. The Nu-Link2-Me supports virtual COM (VCOM) port for printing debug messages on PC.
Besides, the programming status could be shown on the built-in LEDs. Lastly, the Nu-Link2-Me could
be detached from the development board and becoming a stand-alone mass production programmer.
Figure 1-1 NuMaker-M031KG Development Board

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2 FEATURES
NuMicro®M031KG8AE microcontroller with function compatible with:
M031KG8AE
M031KG6AE
M031SG8AE
M031SG6AE
M031LG8AE
M031LG6AE
M031KG8AE extension connectors
Arduino UNO compatible extension connectors
Ammeter connector for measuring the microcontroller’s power consumption
Flexible board power supply:
External VDD power connector
Arduino UNO compatible extension connector Vin
USB FS connector on M031 platform
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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3 HARDWARE CONFIGURATION
Front View3.1
ICE USB Connector
VCOM Switch
Reset Button
ICE Status LED
Off-line Program Button
USB PWR Connector
Power LED
PB14 LED
VDD Switch
M031KG8AE M031KG8AE Extension Connectors
Arduino UNO Compatible Extension Connectors
External VDD Connector
Nu-Link2-Me
Ammeter
ICE Chip: M48SSIDAE
External VSS Connector
M031 Platform
External VREF Connector
Figure 3-1 Front View of NuMaker-M031KG
Figure 3-1 shows the main components and connectors from the front side of NuMaker-M031KG. The
following lists components and connectors from the front view:
Target chip: M031KG8AE (U1)
USB PWR 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)
External VREF Connector (VREF1)
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 View3.2
Figure 3-2 shows the main components and connectors from the rear side of NuMaker-M031KG.
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 3-2 Rear View of NuMaker-M031KG

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Extension Connectors3.3
Table 3-1 presents the extension connectors.
Connector
Description
JP3, JP4, JP5 and JP6
Full pins extension connectors on the NuMaker-M031KG.
NU1, NU2, NU3 and NU4
Arduino UNO compatible pins on the NuMaker-M031KG.
Table 3-1 Extension Connectors
3.3.1 Pin Assignment for Extension Connectors
The NuMaker-M031KG provides the M031KG8AE onboard and extension connectors (JP3, JP4, JP5
and JP6). The Figure 3-3 shows the M031KG8AE extension connectors.
JP3
Pin1 ~ Pin32
JP6
Pin97 ~ Pin128
JP5 Pin33 ~ Pin64
JP4 Pin65 ~ Pin96
Figure 3-3 M031KG8AE Extension Connectors

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Header
M031KG8AE
Pin No.
Function
JP3
JP3.1
1
PB.5/ADC0_CH5/ACMP1_N/EBI_ADR0/I2C0_SCL/UART5_TXD/USCI1_CTL0/PWM0_CH0/UART2
_TXD/TM0/INT0
JP3.2
2
PB.4/ADC0_CH4/ACMP1_P1/EBI_ADR1/I2C0_SDA/UART5_RXD/USCI1_CTL1/PWM0_CH1/UART
2_RXD/TM1/INT1
JP3.3
3
PB.3/ADC0_CH3/ACMP0_N/EBI_ADR2/I2C1_SCL/UART1_TXD/UART5_nRTS/USCI1_DAT1/PWM
0_CH2/PWM0_BRAKE0/TM2/INT2
JP3.4
4
PB.2/ADC0_CH2/ACMP0_P1/EBI_ADR3/I2C1_SDA/UART1_RXD/UART5_nCTS/USCI1_DAT0/PW
M0_CH3/TM3/INT3
JP3.5
5
PC.12/EBI_ADR4/UART0_TXD/I2C0_SCL/PWM1_CH0/ACMP0_O
JP3.6
6
PC.11/EBI_ADR5/UART0_RXD/I2C0_SDA/PWM1_CH1/ACMP1_O
JP3.7
7
PC.10/EBI_ADR6/UART3_TXD/PWM1_CH2
JP3.8
8
PC.9/EBI_ADR7/UART3_RXD/PWM1_CH3
JP3.9
9
PB.1/ADC0_CH1/EBI_ADR8/UART2_TXD/USCI1_CLK/I2C1_SCL/QSPI0_MISO1/PWM0_CH4/PW
M1_CH4/PWM0_BRAKE0
JP3.10
10
PB.0/ADC0_CH0/EBI_ADR9/UART2_RXD/SPI0_I2SMCLK/I2C1_SDA/QSPI0_MOSI1/PWM0_CH5/
PWM1_CH5/PWM0_BRAKE1
JP3.11
11
VSS
JP3.12
12
VDD
JP3.13
13
PA.11/ACMP0_P0/EBI_nRD/USCI0_CLK/BPWM0_CH0/TM0_EXT
JP3.14
14
PA.10/ACMP1_P0/EBI_nWR/USCI0_DAT0/BPWM0_CH1/TM1_EXT
JP3.15
15
PA.9/EBI_MCLK/USCI0_DAT1/UART1_TXD/BPWM0_CH2/TM2_EXT
JP3.16
16
PA.8/EBI_ALE/USCI0_CTL1/UART1_RXD/BPWM0_CH3/TM3_EXT/INT4
JP3.17
17
PC.13/EBI_ADR10/USCI0_CTL0/UART2_TXD/BPWM0_CH4/CLKO/ADC0_ST
JP3.18
18
PD.12/EBI_nCS0/UART2_RXD/BPWM0_CH5/CLKO/ADC0_ST/INT5
JP3.19
19
PD.11/EBI_nCS1/UART1_TXD
JP3.20
20
PD.10/UART1_RXD
JP3.21
21
PG.2/EBI_ADR11/I2C0_SMBAL/I2C1_SCL/TM0
JP3.22
22
PG.3/EBI_ADR12/I2C0_SMBSUS/I2C1_SDA/TM1
JP3.23
23
PG.4/EBI_ADR13/TM2
JP3.24
24
PF.11/EBI_ADR14/UART5_TXD/TM3
JP3.25
25
PF.10/EBI_ADR15/SPI0_I2SMCLK/UART5_RXD
JP3.26
26
PF.9/EBI_ADR16/SPI0_SS/UART5_nRTS
JP3.27
27
PF.8/EBI_ADR17/SPI0_CLK/UART5_nCTS
JP3.28
28
PF.7/EBI_ADR18/SPI0_MISO/UART4_TXD
JP3.29
29
PF.6/EBI_ADR19/SPI0_MOSI/UART4_RXD/EBI_nCS0
JP3.30
30
PF.14/PWM1_BRAKE0/PWM0_BRAKE0/PWM0_CH4/CLKO/TM3/INT5
JP3.31
31
PF.5/UART2_RXD/UART2_nCTS/PWM0_CH0/BPWM0_CH4/X32_IN/ADC0_ST
JP3.32
32
PF.4/UART2_TXD/UART2_nRTS/PWM0_CH1/BPWM0_CH5/X32_OUT

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Header
M031KG8AE
Pin No.
Function
JP5
JP5.1
33
PH.4/EBI_ADR3
JP5.2
34
PH.5/EBI_ADR2
JP5.3
35
PH.6/EBI_ADR1
JP5.4
36
PH.7/EBI_ADR0
JP5.5
37
PF.3/EBI_nCS0/UART0_TXD/I2C0_SCL/XT1_IN/BPWM1_CH0
JP5.6
38
PF.2/EBI_nCS1/UART0_RXD/I2C0_SDA/QSPI0_CLK/XT1_OUT/BPWM1_CH1
JP5.7
39
VSS
JP5.8
40
VDD
JP5.9
41
PE.8/EBI_ADR10/USCI1_CTL1/UART2_TXD/PWM0_CH0/PWM0_BRAKE0
JP5.10
42
PE.9/EBI_ADR11/USCI1_CTL0/UART2_RXD/PWM0_CH1/PWM0_BRAKE1
JP5.11
43
PE.10/EBI_ADR12/USCI1_DAT0/UART3_TXD/PWM0_CH2/PWM1_BRAKE0
JP5.12
44
PE.11/EBI_ADR13/USCI1_DAT1/UART3_RXD/UART1_nCTS/PWM0_CH3/PWM1_BRAKE1
JP5.13
45
PE.12/EBI_ADR14/USCI1_CLK/UART1_nRTS/PWM0_CH4
JP5.14
46
PE.13/EBI_ADR15/I2C0_SCL/UART4_nRTS/UART1_TXD/PWM0_CH5/PWM1_CH0/BPWM1_CH5
JP5.15
47
PC.8/EBI_ADR16/I2C0_SDA/UART4_nCTS/UART1_RXD/PWM1_CH1/BPWM1_CH4
JP5.16
48
PC.7/EBI_AD9/UART4_TXD/UART0_nCTS/PWM1_CH2/BPWM1_CH0/TM0/INT3
JP5.17
49
PC.6/EBI_AD8/UART4_RXD/UART0_nRTS/PWM1_CH3/BPWM1_CH1/TM1/INT2
JP5.18
50
PA.7/EBI_AD7/UART0_TXD/I2C1_SCL/PWM1_CH4/BPWM1_CH2/ACMP0_WLAT/TM2/INT1
JP5.19
51
PA.6/EBI_AD6/UART0_RXD/I2C1_SDA/PWM1_CH5/BPWM1_CH3/ACMP1_WLAT/TM3/INT0
JP5.20
52
VSS
JP5.21
53
VDD
JP5.22
54
PD.15/PWM0_CH5/TM3/INT1
JP5.23
55
PA.5/QSPI0_MISO1/UART0_nCTS/UART0_TXD/I2C0_SCL/UART5_TXD/BPWM0_CH5/PWM0_CH
0
JP5.24
56
PA.4/QSPI0_MOSI1/SPI0_I2SMCLK/UART0_nRTS/UART0_RXD/I2C0_SDA/UART5_RXD/BPWM0
_CH4/PWM0_CH1
JP5.25
57
PA.3/QSPI0_SS/SPI0_SS/UART4_TXD/I2C0_SMBAL/UART1_TXD/I2C1_SCL/BPWM0_CH3/PWM0
_CH2/CLKO/PWM1_BRAKE1
JP5.26
58
PA.2/QSPI0_CLK/SPI0_CLK/UART4_RXD/I2C0_SMBSUS/UART1_RXD/I2C1_SDA/BPWM0_CH2/
PWM0_CH3
JP5.27
59
PA.1/QSPI0_MISO0/SPI0_MISO/UART0_TXD/UART1_nCTS/BPWM0_CH1/PWM0_CH4
JP5.28
60
PA.0/QSPI0_MOSI0/SPI0_MOSI/UART0_RXD/UART1_nRTS/BPWM0_CH0/PWM0_CH5
JP5.29
61
PF.15/PWM0_BRAKE0/PWM0_CH1/TM2/CLKO/INT4
JP5.30
62
PE.14/EBI_AD8/UART2_TXD
JP5.31
63
PE.15/EBI_AD9/UART2_RXD
JP5.32
64
nRESET
JP4
JP4.1
65
PF.0/UART1_TXD/I2C1_SCL/UART0_TXD/BPWM1_CH0/ICE_DAT
JP4.2
66
PF.1/UART1_RXD/I2C1_SDA/UART0_RXD/BPWM1_CH1/ICE_CLK

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Header
M031KG8AE
Pin No.
Function
JP4.3
67
PD.9/EBI_AD7/UART2_nCTS
JP4.4
68
PD.8/EBI_AD6/UART2_nRTS
JP4.5
69
PC.5/EBI_AD5/QSPI0_MISO1/UART2_TXD/I2C1_SCL/UART4_TXD/PWM1_CH0
JP4.6
70
PC.4/EBI_AD4/QSPI0_MOSI1/UART2_RXD/I2C1_SDA/UART4_RXD/PWM1_CH1
JP4.7
71
PC.3/EBI_AD3/QSPI0_SS/UART2_nRTS/I2C0_SMBAL/UART3_TXD/PWM1_CH2
JP4.8
72
PC.2/EBI_AD2/QSPI0_CLK/UART2_nCTS/I2C0_SMBSUS/UART3_RXD/PWM1_CH3
JP4.9
73
PC.1/EBI_AD1/QSPI0_MISO0/UART2_TXD/I2C0_SCL/PWM1_CH4/ACMP0_O/ADC0_ST
JP4.10
74
PC.0/EBI_AD0/QSPI0_MOSI0/UART2_RXD/I2C0_SDA/PWM1_CH5/ACMP1_O
JP4.11
75
VSS
JP4.12
76
VDD
JP4.13
77
PG.9/EBI_AD0/BPWM0_CH5
JP4.14
78
PG.10/EBI_AD1/BPWM0_CH4
JP4.15
79
PG.11/EBI_AD2/BPWM0_CH3
JP4.16
80
PG.12/EBI_AD3/BPWM0_CH2
JP4.17
81
PG.13/EBI_AD4/BPWM0_CH1
JP4.18
82
PG.14/EBI_AD5/BPWM0_CH0
JP4.19
83
PG.15/CLKO/ADC0_ST
JP4.20
84
PD.7/UART1_TXD/I2C0_SCL/USCI1_CLK
JP4.21
85
PD.6/UART1_RXD/I2C0_SDA/USCI1_DAT1
JP4.22
86
PD.5/I2C1_SCL/USCI1_DAT0
JP4.23
87
PD.4/USCI0_CTL0/I2C1_SDA/USCI1_CTL1
JP4.24
88
PD.3/EBI_AD10/USCI0_CTL1/SPI0_SS/UART3_nRTS/USCI1_CTL0/UART0_TXD
JP4.25
89
PD.2/EBI_AD11/USCI0_DAT1/SPI0_CLK/UART3_nCTS/UART0_RXD
JP4.26
90
PD.1/EBI_AD12/USCI0_DAT0/SPI0_MISO/UART3_TXD
JP4.27
91
PD.0/EBI_AD13/USCI0_CLK/SPI0_MOSI/UART3_RXD/TM2
JP4.28
92
PD.13/EBI_AD10/SPI0_I2SMCLK
JP4.29
93
PA.12/UART4_TXD/I2C1_SCL/BPWM1_CH2
JP4.30
94
PA.13/UART4_RXD/I2C1_SDA/BPWM1_CH3
JP4.31
95
PA.14/UART0_TXD/BPWM1_CH4
JP4.32
96
PA.15/UART0_RXD/BPWM1_CH5
JP6
JP6.1
97
PE.7/UART5_TXD/PWM0_CH0/BPWM0_CH5
JP6.2
98
PE.6/USCI0_CTL0/UART5_RXD/PWM0_CH1/BPWM0_CH4
JP6.3
99
PE.5/EBI_nRD/USCI0_CTL1/PWM0_CH2/BPWM0_CH3
JP6.4
100
PE.4/EBI_nWR/USCI0_DAT1/PWM0_CH3/BPWM0_CH2
JP6.5
101
PE.3/EBI_MCLK/USCI0_DAT0/PWM0_CH4/BPWM0_CH1

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Header
M031KG8AE
Pin No.
Function
JP6.6
102
PE.2/EBI_ALE/USCI0_CLK/PWM0_CH5/BPWM0_CH0
JP6.7
103
VSS
JP6.8
104
VDD
JP6.9
105
PE.1/EBI_AD10/QSPI0_MISO0/UART3_TXD/I2C1_SCL/UART4_nCTS
JP6.10
106
PE.0/EBI_AD11/QSPI0_MOSI0/UART3_RXD/I2C1_SDA/UART4_nRTS
JP6.11
107
PH.8/EBI_AD12/QSPI0_CLK/UART3_nRTS/UART1_TXD
JP6.12
108
PH.9/EBI_AD13/QSPI0_SS/UART3_nCTS/UART1_RXD
JP6.13
109
PH.10/EBI_AD14/QSPI0_MISO1/UART4_TXD/UART0_TXD
JP6.14
110
PH.11/EBI_AD15/QSPI0_MOSI1/UART4_RXD/UART0_RXD/PWM0_CH5
JP6.15
111
PD.14/EBI_nCS0/SPI0_I2SMCLK/USCI0_CTL0/PWM0_CH4
JP6.16
112
VSS
JP6.17
113
LDO_CAP
JP6.18
114
VDD
JP6.19
115
PC.14/EBI_AD11/SPI0_I2SMCLK/USCI0_CTL0/QSPI0_CLK/TM1
JP6.20
116
PB.15/ADC0_CH15/EBI_AD12/SPI0_SS/USCI0_CTL1/UART0_nCTS/UART3_TXD/PWM1_CH0/TM
0_EXT/PWM0_BRAKE1
JP6.21
117
PB.14/ADC0_CH14/EBI_AD13/SPI0_CLK/USCI0_DAT1/UART0_nRTS/UART3_RXD/PWM1_CH1/T
M1_EXT/CLKO
JP6.22
118
PB.13/ADC0_CH13/ACMP0_P3/ACMP1_P3/EBI_AD14/SPI0_MISO/USCI0_DAT0/UART0_TXD/UA
RT3_nRTS/PWM1_CH2/TM2_EXT
JP6.23
119
PB.12/ADC0_CH12/ACMP0_P2/ACMP1_P2/EBI_AD15/SPI0_MOSI/USCI0_CLK/UART0_RXD/UAR
T3_nCTS/PWM1_CH3/TM3_EXT
JP6.24
120
AVDD
JP6.25
121
VREF
JP6.26
122
AVSS
JP6.27
123
PB.11/ADC0_CH11/EBI_ADR16/UART0_nCTS/UART4_TXD/I2C1_SCL/SPI0_I2SMCLK/BPWM1_C
H0
JP6.28
124
PB.10/ADC0_CH10/EBI_ADR17/USCI1_CTL0/UART0_nRTS/UART4_RXD/I2C1_SDA/BPWM1_CH
1
JP6.29
125
PB.9/ADC0_CH9/EBI_ADR18/USCI1_CTL1/UART0_TXD/UART1_nCTS/BPWM1_CH2
JP6.30
126
PB.8/ADC0_CH8/EBI_ADR19/USCI1_CLK/UART0_RXD/UART1_nRTS/BPWM1_CH3
JP6.31
127
PB.7/ADC0_CH7/EBI_nWRL/USCI1_DAT0/UART1_TXD/EBI_nCS0/BPWM1_CH4/PWM1_BRAKE0/
PWM1_CH4/INT5/ACMP0_O
JP6.32
128
PB.6/ADC0_CH6/EBI_nWRH/USCI1_DAT1/UART1_RXD/EBI_nCS1/BPWM1_CH5/PWM1_BRAKE1
/PWM1_CH5/INT4/ACMP1_O
Table 3-2 M031KG8AE Full-pin Extension Connectors and GPIO Function List

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NUMAKER-M031KG USER MANUAL
Maker Nu-mbed NUC472 User Manual
3.3.2 Arduino UNO Compatible Extension Connectors
Figure 3-4 shows the Arduino UNO compatible extension connectors.
MISO CLK RESET SS
PA.9 PA.11 nRESET PA.8
USCI0_DAT1 USCI0_CLK
5V MOSI GND -
VDD PA.10 VSS PB.15
USCI0_DAT0
PWM0_CH0 PA.5 D8
PWM0_CH1 PA.4 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
VREF VREF
I2C0_SDA PC.0 SDA
I2C0_SCL PC.1 SCL
UART1_RXD PWM0_CH3 PB.2 D0
UART1_TXD PWM0_CH2 PB.3 D1
I2C1_SDA PWM1_CH1 PC.4 D2
I2C1_SCL PWM1_CH0 PC.5 D3
PWM1_CH2 PC.3 D4
PWM1_CH3 PC.2 D5
PWM1_CH4 PA.7 D6
PWM1_CH5 PA.6 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.6 ADC0_CH6
A0 PB.7 ADC0_CH7
Figure 3-4 Arduino UNO Compatible Extension Connectors

NuMaker-M031KG
May. 07, 2020 Page 17 of 47 Rev 1.00
NUMAKER-M031KG USER MANUAL
Maker Nu-mbed NUC472 User Manual
Header
NuMaker-M031KG
Header
NuMaker-M031KG
Compatible to
Arduino UNO
GPIO Pin of M031
Compatible to
Arduino UNO
GPIO Pin of M031
N
U
3
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
PC.4
NU2.4
A3
PB.4
NU3.4
D3
PC.5
NU2.3
A2
PB.5
NU3.5
D4
PC.3
NU2.2
A1
PB.6
NU3.6
D5
PC.2
NU2.1
A0
PB.7
NU3.7
D6
PA.7
N
U
1
NU1.8
VIN
-
NU3.8
D7
PA.6
NU1.7
VSS
N
U
4
NU4.1
D8
PA.5
NU1.6
VSS
NU4.2
D9
PA.4
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
VREF
NU4.6
D13
PA.2
NU1.1
NC
-
NU4.7
VSS
VSS
NU4.8
VREF
VREF
NU4.9
SDA
PC.0
NU4.10
SCL
PC.1
Table 3-3 Arduino UNO Extension Connectors and M031KG8AE Mapping GPIO List

NuMaker-M031KG
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NUMAKER-M031KG USER MANUAL
Maker Nu-mbed NUC472 User Manual
Power Supply Configuration3.4
The NuMaker-M031KG is able to adopt multiple power supply. External power source include NU1 Vin
(7 V to 12 V), VDD (depends on target chip operating voltage), and PC through USB connector. By
using switches and voltage regulator, multiple power domains can be created on the NuMaker-
M031KG.
3.4.1 VIN Power Source
Table 3-4 presents the Vin power source.
Connector
Net Name in
Schematic
Description
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 NU1_5VCC.
Table 3-4 Vin Power Source
3.4.2 5 V Power Sources
Table 3-5 presents the 5 V power sources.
Connector
Net Name in
Schematic
Description
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-M031KG 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 3-5 5 V Power Sources

NuMaker-M031KG
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Maker Nu-mbed NUC472 User Manual
3.4.3 3.3 V Power Sources
Table 3-6 presents the 3.3 V power sources.
Voltage Regulator
5 V Source
Description
ICEUP1
USB_HS_VBUS
ICEUP1 converts USB_HS_VBUS to 3.3 V and supplies
3.3 V 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 3-6 3.3 V Power Sources
3.4.4 1.8 V Power Sources
Table 3-7 presents the 1.8 V power source.
Voltage Regular
5V Source
Description
ICEUP2
USB_HS_VBUS
ICEUP2 converts USB_HS_VBUS to 1.8 V and supplies
1.8 V to M031 platform or ICE chip.
Table 3-7 1.8 V Power Sources
3.4.5 Power Connectors
Table 3-8 presents the power connectors.
Connector
Description
JP1
VDD connector on the NuMaker-M031KG.
Note: M031 operating voltage range is from 1.8 V to 3.6 V.
JP2
VSS connector on the NuMaker-M031KG.
Table 3-8 Power Connectors

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May. 07, 2020 Page 20 of 47 Rev 1.00
NUMAKER-M031KG USER MANUAL
Maker Nu-mbed NUC472 User Manual
3.4.6 USB Connectors
Table 3-9 presents the USB connectors.
Connector
Description
ICEJ3
ICE USB connector on Nu-Link2-Me for power supply, debugging and
programming from PC.
J2
USB FS connector on NuMaker-M031KG for power supply.
Table 3-9 USB Connectors
3.4.7 Power Switches
Table 3-10 presents the power switches.
Switch
Description
ICEJPR1
Configures the target chip operating voltage at 1.8 V / 3.3 V / 5 V.
Note: M031 operating voltage range is from 1.8 V to 3.6 V. Do not switch
ICEJPR1 (MCUVCC) to 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.
Note: M031 operating voltage range is from 1.8 V to 3.6 V. Do not switch
SW2.1 (NU1 5VCC) to ON.
Table 3-10 Power Switches
3.4.8 Power Supply Models
External Power Supply through Nu-Link2-Me to Target Chip3.4.8.1
The external power supply source on Nu-Link2-Me is shown in Figure 3-5.
ICE USB Connector (ICEJ3)
Nu-Link2-Me
Figure 3-5 External Power Supply Sources on Nu-Link2-Me