Nuvoton NuMaker-M0A23OC User manual

NuMaker-M0A23OC
Oct. 23, 2020 Page 1of 48 Rev 1.01
NUMAKER-M0A23OC USER MANUAL
Maker Nu-mbed NUC472 User Manual
ARM®Cortex®-M
32-bit Microcontroller
NuMaker-M0A23OC
User Manual
NuMicro®M0A21 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..............................................................................................113.2
Extension Connectors................................................................................123.3
3.3.1 Pin Assignment for Extension Connectors................................................................ 12
3.3.2 Arduino UNO Compatible Extension Connectors ....................................................... 15
Power Supply Configuration ........................................................................173.4
3.4.1 VIN Power Source............................................................................................ 17
3.4.2 5 V Power Sources ........................................................................................... 17
3.4.3 3.3 V Power Sources......................................................................................... 18
3.4.4 Power Connectors............................................................................................ 18
3.4.5 USB Connectors .............................................................................................. 19
3.4.6 Power Switches............................................................................................... 19
3.4.7 Power Supply Models........................................................................................ 19
Ammeter Connector..................................................................................223.5
Function Switches ....................................................................................233.6
CAN Mode Selection.................................................................................243.7
LIN Mode Selection...................................................................................243.8
Push Buttons ..........................................................................................253.9
LEDs....................................................................................................253.10
Nu-Link2-Me...........................................................................................253.11
3.11.1 VCOM Switches............................................................................................... 25
3.11.2 Status LEDs ................................................................................................... 26
4Quick Start ........................................................................................ 27
Toolchains Support...................................................................................274.1
Nuvoton Nu-Link Driver Installation................................................................274.2
BSP Firmware Download............................................................................294.3
Hardware Setup.......................................................................................294.4
Find the Example Project............................................................................314.5
Execute the Project under Toolchains.............................................................314.6
4.6.1 Keil MDK ....................................................................................................... 31

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4.6.2 IAR EWARM................................................................................................... 35
4.6.3 NuEclipse ...................................................................................................... 37
5NuMaker-M0A23OC Schematics.............................................................. 43
Nu-Link2-Me...........................................................................................435.1
M0A21 Platform.......................................................................................445.2
Extension Connector.................................................................................455.3
PCB Placement .......................................................................................465.4
6REVISION HISTORY............................................................................ 47

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List of Figures
Figure 1-1 NuMaker-M0A23OC Development Board...................................................................... 7
Figure 3-1 Front View of NuMaker-M0A23OC................................................................................. 9
Figure 3-2 Rear View of NuMaker-M0A23OC ............................................................................... 11
Figure 3-3 M0A23OC1AC Extension Connectors.......................................................................... 12
Figure 3-4 Arduino UNO Compatible Extension Connectors......................................................... 15
Figure 3-5 External Power Supply Sources on Nu-Link2-Me ........................................................ 19
Figure 3-6 External Power Supply Sources on M0A21 platform ................................................... 20
Figure 3-7 Detach the Nu-Link2-Me from NuMaker-M0A23OC..................................................... 21
Figure 3-8 Wiring between Ammeter Connector and Ammeter..................................................... 23
Figure 3-9 Function Switches on NuMaker-M0A23OC.................................................................. 24
Figure 4-1 Nu-Link USB Driver Installation Setup.......................................................................... 27
Figure 4-2 Nu-Link USB Driver Installation.................................................................................... 28
Figure 4-3 Open VCOM Function .................................................................................................. 29
Figure 4-4 ICE USB Connector...................................................................................................... 29
Figure 4-5 Device Manger.............................................................................................................. 30
Figure 4-6 PuTTY Session Setting................................................................................................. 30
Figure 4-7 Template Project Folder Path....................................................................................... 31
Figure 4-8 Warning Message of “Device not found” ...................................................................... 31
Figure 4-9 Project File Migrate to Version 5 Format...................................................................... 32
Figure 4-10 Debugger Setting in Options Window......................................................................... 32
Figure 4-11 Programming Setting in Options Window................................................................... 33
Figure 4-12 Compile and Download the Project............................................................................ 33
Figure 4-13 Keil MDK Debug Mode............................................................................................... 34
Figure 4-14 Debug Message on Serial Port Terminal Windows.................................................... 34
Figure 4-15 IAR EWARM Window................................................................................................. 35
Figure 4-16 Compile and Download the Project............................................................................ 35
Figure 4-17 IAR EWARM Debug Mode ......................................................................................... 36
Figure 4-18 Debug Message on Serial Port Terminal Windows.................................................... 36
Figure 4-19 Import the Project in NuEclipse .................................................................................. 37
Figure 4-20 Import Projects Windows............................................................................................ 37
Figure 4-21 Open Project Properties Window ............................................................................... 38
Figure 4-22 Project Properties Settings......................................................................................... 38
Figure 4-23 Build Project................................................................................................................ 39
Figure 4-24 Open Debug Configuration......................................................................................... 39
Figure 4-25 Main Tab Configuration .............................................................................................. 40
Figure 4-26 Debugger Tab Configuration ...................................................................................... 40

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Figure 4-27 Startup Tab Configuration .......................................................................................... 41
Figure 4-28 NuEclipse Debug Mode.............................................................................................. 42
Figure 4-29 Debug Message on Serial Port Terminal Windows.................................................... 42
Figure 5-1 Nu-Link2-Me Circuit...................................................................................................... 43
Figure 5-2 M0A21 platform Circuit................................................................................................. 44
Figure 5-3 Extension Connectors Circuit ....................................................................................... 45
Figure 5-4 Front Placement ........................................................................................................... 46
Figure 5-5 Rear Placement............................................................................................................ 46

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List of Tables
Table 3-1 Extension Connectors.................................................................................................... 12
Table 3-2 M0A23OC1AC Full-pin Extension Connectors and GPIO Function List ....................... 14
Table 3-3 Arduino UNO Extension Connectors and M0A23OC1AC Mapping GPIO List.............. 16
Table 3-4 Vin Power Source.......................................................................................................... 17
Table 3-5 5 V Power Sources........................................................................................................ 17
Table 3-6 3.3 V Power Sources..................................................................................................... 18
Table 3-7 Power Connectors ......................................................................................................... 18
Table 3-8 USB Connectors ............................................................................................................ 19
Table 3-9 Power Switches ............................................................................................................. 19
Table 3-10 Supply External Power through Nu-Link2-Me ............................................................. 20
Table 3-11 Supply External Power for M0A21 Platform ................................................................ 22
Table 3-12 Ammeter Connector..................................................................................................... 22
Table 3-13 Function Switches........................................................................................................ 23
Table 3-14 Operating Mode of CAN Transceiver........................................................................... 24
Table 3-15 Operating Mode of LIN Transceiver............................................................................. 24
Table 3-16 Push-Buttons ............................................................................................................... 25
Table 3-17 LEDs ............................................................................................................................ 25
Table 3-18 VCOM Function of Nu-Link2-Me.................................................................................. 25
Table 3-19 Operation Status LED Patterns ................................................................................... 26

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1 OVERVIEW
The NuMaker-M0A23OC is a development board for Nuvoton NuMicro®M0A21 microcontrollers. The
NuMaker-M0A23OC consists of two parts: a M0A21 platform and an on-board Nu-Link2-Me debugger
and programmer. The NuMaker-M0A23OC is designed for industrial and automotive control
application evaluation, prototype development and validation with power consumption monitoring
function.
The M0A21 platform is based on NuMicro®M0A23OC1AC. For the development flexibility, the M0A21
platform provides the extension connectors of M0A23OC1AC, the Arduino UNO compatible headers
and able to adopt multiple power supply. The M0A21 platform also provides CAN and LIN transceiver
for relative function development. Furthermore, the Nuvoton-designed ammeter connector can
measure the power consumption instantly, which is essential for the prototype evaluation.
In addition to the M0A21 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 can be shown on the built-in LEDs. Further, the Nu-Link2-Me
can be detached from the development board to become a stand-alone mass production programmer.
Figure 1-1 NuMaker-M0A23OC Development Board

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2 FEATURES
NuMicro®M0A23OC1AC microcontroller with function compatible with:
M0A23OC1AC
M0A23OB1AC
M0A21OC1AC
M0A21OB1AC
M0A23OC1AC full pin extension connectors
Arduino UNO compatible extension connectors
Ammeter connector for measuring the microcontroller’s power consumption
Flexible board power source:
External VDD power connector
Arduino UNO compatible extension connector Vin
LIN bus connector JP8_5VCC
USB FS connector on M0A21 platform
ICE USB connector on Nu-Link2-Me
On-board CAN transceiver and bus connector
On-board LIN transceiver and bus connector
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
PA2 LED
VDD Switch
M0A23OC1AC M0A23OC1AC Extension Connectors
Arduino UNO Compatible Extension Connectors
External VDD Connector
Nu-Link2-Me
Ammeter
ICE Chip: M48SSIDAE
External VSS Connector
M0A21 Platform
Button
CAN Transceiver
CAN Bus Connector
LIN Transceiver
LIN Bus Connector
LIN Mode Selection
CAN Mode Selection
CAN Function Switch
Button & LED Function Switch LIN Function Switch
LXT Function Switch
HXT Function Switch
SWD Function Switch
Arduino D7~9 Function Switch
Figure 3-1 Front View of NuMaker-M0A23OC
Figure 3-1 shows the main components and connectors from the front side of NuMaker-M0A23OC.
The following lists components and connectors from the front view:
Target chip: M0A23OC1AC (U2)
USB PWR Connector (J2)
Arduino UNO Compatible Extension Connectors (NU1, NU2, NU3, NU4)
M0A21 Extension Connectors (JP3, JP4, JP5 and JP6)
External VDD Power Connector (JP1)
External VSS Power Connector (JP2)
On-board CAN Transceiver (U3)
CAN Bus Connector (JP7 and CAN0)
CAN Function Switch (SW6)
Enable PB.5 and PB.7 to CAN transceiver
Enable PC.3 to control CAN Mode
On-board LIN Transceiver (U4)
LIN Bus Connector (JP8)
LIN Function Switch (SW10)
Enable PC.6 and PC.7 to LIN transceiver
Enable PC.0 to control LIN mode
VDD Switch (SW2)
Ammeter Connector (AMMETER)
Reset Button (SW1)
Power LED and PA2 LED (LEDG1 and LEDR1)
Button (SW3)

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Button & LED Function Switch (SW7)
Enable PC.2 to Button
Enable PA.2 to LEDR1
HXT Function Switch (SW4)
Enable PA.4 and PA.5 to External 12 MHz Crystal
LXT Function Switch (SW5)
Enable PC.4 and PC.5 to External 32.768 kHz Crystal
SWD Function Switch (SW8)
Enable PA.0 and PA.1 to ICE_DAT and ICE_CLK
Enable PA.3 to nRESET
Arduino D7~9 Function Switch
Enable PA.0, PA.1 and PA.3 to Arduino D9, D8 and D7
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-M0A23OC.
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-M0A23OC

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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-M0A23OC.
NU1, NU2, NU3 and NU4
Arduino UNO compatible pins on the NuMaker-M0A23OC.
Table 3-1 Extension Connectors
3.3.1 Pin Assignment for Extension Connectors
The NuMaker-M0A23OC provides the M0A23OC1AC onboard and extension connectors (JP3, JP4,
JP5 and JP6). Figure 3-3 shows the M0A23OC1AC extension connectors.
JP4
Pin6 ~ Pin10
JP3
Pin1 ~ Pin5
JP5 Pin11 ~ Pin15
JP6 Pin16 ~ Pin20
Figure 3-3 M0A23OC1AC Extension Connectors

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Header
M0A23OC1AC
Pin No.
Function
JP3
JP3.1
1
VDD
JP3.2
2
PA.5 / ADC0_CH16 / UART0_nRTS / XT1_IN / CLKO / PWM0_CH0 / PWM0_CH2 /
PWM0_CH4 / UART0_TXD / UART0_RXD / USCI0_CLK / USCI0_DAT0 / USCI0_DAT1 /
USCI0_CTL0 / USCI0_CTL1 / USCI1_CLK / USCI1_DAT0 / USCI1_DAT1 / USCI1_CTL0
/ ACMP0_O / ACMP1_O / ADC0_ST / TM0 / TM2 / TM0_EXT / TM2_EXT / UART1_TXD /
UART1_RXD / ACMP0_WLAT
JP3.3
3
PA.4 / ADC0_CH15 / UART0_nRTS / XT1_OUT / CLKO / PWM0_CH1 / PWM0_CH3 /
PWM0_CH5 / UART0_TXD / UART0_RXD / USCI0_CLK / USCI0_DAT0 / USCI0_DAT1 /
USCI0_CTL0 / USCI1_CTL1 / USCI1_CLK / USCI1_DAT0 / USCI1_DAT1 / USCI1_CTL0
/ ACMP0_O / ACMP1_O / ADC0_ST / TM1 / TM3 / TM1_EXT / TM3_EXT / UART1_TXD /
UART1_RXD / ACMP1_WLAT
JP3.4
4
PA.3 / nRESET / UART0_nCTS / PWM0_CH0 / PWM0_CH2 / PWM0_CH4 /
UART0_RXD / USCI0_CLK / USCI0_DAT0 / USCI0_DAT1 / USCI0_CTL0 / USCI0_CTL1
/ USCI1_CLK / USCI1_DAT0 / USCI1_DAT1 / USCI1_CTL0 / ADC0_ST / TM0 / TM2 /
TM0_EXT / TM2_EXT / UART1_RXD / INT0
JP3.5
5
PC.5 / ADC0_CH14 / X32_IN / UART0_nCTS / CLKO / PWM0_CH1 / PWM0_CH3 /
PWM0_CH5 / UART0_TXD / UART0_RXD / USCI0_CLK / USCI0_DAT0 / USCI0_DAT1 /
USCI0_CTL0 / USCI0_CTL1 / USCI1_CLK / USCI1_DAT0 / USCI1_DAT1 / USCI1_CTL0
/ ACMP0_O / ACMP1_O / ADC0_ST / TM1 / TM3 / TM1_EXT / TM3_EXT / UART1_TXD /
UART1_RXD / INT1
JP4
JP4.1
6
PC.4 / ADC0_CH13 / X32_OUT / UART0_nCTS / CLKO / PWM0_CH0 / PWM0_CH2 /
PWM0_CH4 / UART0_TXD / UART0_RXD / USCI0_CLK / USCI0_DAT0 / USCI0_DAT1 /
USCI0_CTL0 / USCI1_CTL1 / USCI1_CLK / USCI1_DAT0 / USCI1_DAT1 / USCI1_CTL0
/ ACMP0_O / ACMP1_O / ADC0_ST / TM0 / TM2 / TM0_EXT / TM2_EXT / UART1_TXD /
UART1_RXD / INT2
JP4.2
7
PC.3 / ADC0_CH12 / ACMP0_N3 / ACMP1_N3 / UART0_nRTS / UART0_nCTS / CLKO /
PWM0_CH1 / PWM0_CH3 / PWM0_CH5 / UART0_TXD / UART0_RXD / USCI0_CLK /
USCI0_DAT0 / USCI0_DAT1 / USCI0_CTL0 / USCI0_CTL1 / USCI1_CLK / USCI1_DAT0
/ USCI1_DAT1 / USCI1_CTL0 / ACMP0_O / ACMP1_O / ADC0_ST / TM1 / TM3 /
TM1_EXT / TM3_EXT / UART1_TXD / UART1_RXD / INT3
JP4.3
8
PC.6 / ADC0_CH11 / UART0_nRTS / UART0_nCTS / CLKO / PWM0_CH0 / PWM0_CH2
/ PWM0_CH4 / UART0_TXD / UART0_RXD / USCI0_CLK / USCI0_DAT0 / USCI0_DAT1
/ USCI0_CTL0 / USCI1_CTL1 / USCI1_CLK / USCI1_DAT0 / USCI1_DAT1 /
USCI1_CTL0 / ACMP0_O / ACMP1_O / ADC0_ST / TM0 / TM2 / TM0_EXT / TM2_EXT /
UART1_TXD / UART1_RXD / INT4
JP4.4
9
PC.7 / ADC0_CH10 / UART0_nRTS / UART0_nCTS / CLKO / PWM0_CH1 / PWM0_CH3
/ PWM0_CH5 / UART0_TXD / UART0_RXD / USCI0_CLK / USCI0_DAT0 / USCI0_DAT1
/ USCI0_CTL0 / USCI0_CTL1 / USCI1_CLK / USCI1_DAT0 / USCI1_DAT1 /
USCI1_CTL0 / ACMP0_O / ACMP1_O / ADC0_ST / TM1 / TM3 / TM1_EXT / TM3_EXT /
UART1_TXD / UART1_RXD / INT5
JP4.5
10
PB.7 / ADC0_CH9 / UART0_nRTS / UART0_nCTS / CLKO / PWM0_CH0 / PWM0_CH2 /
PWM0_CH4 / UART0_TXD / UART0_RXD / USCI0_CLK / USCI0_DAT0 / USCI0_DAT1 /
USCI0_CTL0 / USCI1_CTL1 / USCI1_CLK / USCI1_DAT0 / USCI1_DAT1 / USCI1_CTL0
/ ACMP0_O / ACMP1_O / ADC0_ST / TM0 / TM2 / TM0_EXT / TM2_EXT / UART1_TXD /
UART1_RXD / ACMP0_WLAT
JP5
JP5.1
11
PB.6 / ADC0_CH8 / UART0_nRTS / UART0_nCTS / CLKO / PWM0_CH1 / PWM0_CH3 /
PWM0_CH5 / UART0_TXD / UART0_RXD / USCI0_CLK / USCI0_DAT0 / USCI0_DAT1 /
USCI0_CTL0 / USCI0_CTL1 / USCI1_CLK / USCI1_DAT0 / USCI1_DAT1 / USCI1_CTL0
/ ACMP0_O / ACMP1_O / ADC0_ST / TM1 / TM3 / TM1_EXT / TM3_EXT / UART1_TXD /

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Header
M0A23OC1AC
Pin No.
Function
UART1_RXD / ACMP1_WLAT
JP5.2
12
PB.5 / ADC0_CH7 / UART0_nRTS / UART0_nCTS / CLKO / PWM0_CH0 / PWM0_CH2 /
PWM0_CH4 / UART0_TXD / UART0_RXD / USCI0_CLK / USCI0_DAT0 / USCI0_DAT1 /
USCI0_CTL0 / USCI1_CTL1 / USCI1_CLK / USCI1_DAT0 / USCI1_DAT1 / USCI1_CTL0
/ ACMP0_O / ACMP1_O / ADC0_ST / TM0 / TM2 / TM0_EXT / TM2_EXT / UART1_TXD /
UART1_RXD / INT0
JP5.3
13
PB.4 / ADC0_CH6 / UART0_nRTS / UART0_nCTS / CLKO / PWM0_CH1 / PWM0_CH3 /
PWM0_CH5 / UART0_TXD / UART0_RXD / USCI0_CLK / USCI0_DAT0 / USCI0_DAT1 /
USCI0_CTL0 / USCI0_CTL1 / USCI1_CLK / USCI1_DAT0 / USCI1_DAT1 / USCI1_CTL0
/ ACMP0_O / ACMP1_O / ADC0_ST / TM1 / TM3 / TM1_EXT / TM3_EXT / UART1_TXD /
UART1_RXD / UART1_nCTS
JP5.4
14
PC.2 / ADC0_CH5 / ACMP0_N2 / ACMP1_N2 / UART0_nRTS / UART0_nCTS / CLKO /
PWM0_CH0 / PWM0_CH2 / PWM0_CH4 / UART0_TXD / UART0_RXD / USCI0_CLK /
USCI0_DAT0 / USCI0_DAT1 / USCI0_CTL0 / USCI1_CTL1 / USCI1_CLK / USCI1_DAT0
/ USCI1_DAT1 / USCI1_CTL0 / ACMP0_O / ACMP1_O / ADC0_ST / TM0 / TM2 /
TM0_EXT / TM2_EXT / UART1_TXD / UART1_RXD / UART1_nRTS
JP5.5
15
PC.1 / ADC0_CH4 / ACMP0_N1 / ACMP1_N1 / UART0_nRTS / UART0_nCTS / CLKO /
PWM0_CH1 / PWM0_CH3 / PWM0_CH5 / UART0_TXD / UART0_RXD / USCI0_CLK /
USCI0_DAT0 / USCI0_DAT1 / USCI0_CTL0 / USCI0_CTL1 / USCI1_CLK / USCI1_DAT0
/ USCI1_DAT1 / USCI1_CTL0 / ACMP0_O / ACMP1_O / ADC0_ST / TM1 / TM3 /
TM1_EXT / TM3_EXT / UART1_TXD / UART1_RXD
JP6
JP6.1
16
PC.0 / ADC0_CH3 / ACMP1_P0 / UART0_nRTS / UART0_nCTS / CLKO / PWM0_CH0 /
PWM0_CH2 / PWM0_CH4 / UART0_TXD / UART0_RXD / USCI0_CLK / USCI0_DAT0 /
USCI0_DAT1 / USCI0_CTL0 / USCI1_CTL1 / USCI1_CLK / USCI1_DAT0 / USCI1_DAT1
/ USCI1_CTL0 / ACMP0_O / ACMP1_O / ADC0_ST / TM0 / TM2 / TM0_EXT / TM2_EXT
/ UART1_TXD / UART1_RXD / PWM0_BRAKE0
JP6.2
17
PA.2 / ADC0_CH2 / UART0_nRTS / UART0_nCTS / CLKO / PWM0_CH1 / PWM0_CH3 /
PWM0_CH5 / UART0_TXD / UART0_RXD / USCI0_CLK / USCI0_DAT0 / USCI0_DAT1 /
USCI0_CTL0 / USCI0_CTL1 / USCI1_CLK / USCI1_DAT0 / USCI1_DAT1 / USCI1_CTL0
/ ACMP0_O / ACMP1_O / ADC0_ST / TM1 / TM3 / TM1_EXT / TM3_EXT / UART1_TXD /
UART1_RXD / PWM0_BRAKE1
JP6.3
18
PA.1 / ADC0_CH1 / ACMP0_N0 / ACMP1_N0 / VREF+ / ICE_CLK / UART0_nCTS /
CLKO / PWM0_CH0 / PWM0_CH2 / PWM0_CH4 / UART0_TXD / UART0_RXD /
USCI0_CLK / USCI0_DAT0 / USCI0_DAT1 / USCI0_CTL0 / USCI1_CTL1 / USCI1_CLK /
USCI1_DAT0 / USCI1_DAT1 / USCI1_CTL0 / ACMP0_O / ACMP1_O / ADC0_ST / TM0 /
TM2 / TM0_EXT / TM2_EXT / UART1_TXD / UART1_RXD / PWM0_BRAKE0
JP6.4
19
PA.0 / ADC0_CH0 / DAC0_OUT / ACMP0_P0 / ICE_DAT / UART0_nCTS / CLKO /
PWM0_CH1 / PWM0_CH3 / PWM0_CH5 / UART0_TXD / UART0_RXD / USCI0_CLK /
USCI0_DAT0 / USCI0_DAT1 / USCI0_CTL0 / USCI0_CTL1 / USCI1_CLK / USCI1_DAT0
/ USCI1_DAT1 / USCI1_CTL0 / ACMP0_O / ACMP1_O / ADC0_ST / TM1 / TM3 /
TM1_EXT / TM3_EXT / UART1_TXD / UART1_RXD / PWM0_BRAKE1
JP6.5
20
VSS
Table 3-2 M0A23OC1AC Full-pin Extension Connectors and GPIO Function List

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3.3.2 Arduino UNO Compatible Extension Connectors
Figure 3-4 shows the Arduino UNO compatible extension connectors.
PWM0_CH4 PWM0_CH2 PWM0_CH0 PA.1 D8
PWM0_CH5 PWM0_CH3 PWM0_CH1 PA.0 D9
USCI0_CTL0 PWM0_CH5 PWM0_CH3 PWM0_CH1 PC.7 D10
USCI0_DAT0 PWM0_CH5 PWM0_CH3 PWM0_CH1 PC.5 D11
USCI0_DAT1 PWM0_CH4 PWM0_CH2 PWM0_CH0 PC.4 D12
USCI0_CLK PWM0_CH4 PWM0_CH2 PWM0_CH0 PC.6 D13
VSS VSS
NC VREF
USCI1_DAT0 PB.5 SDA
USCI1_CLK PB.7 SCL
UART0_RXD PWM0_CH5 PWM0_CH3 PWM0_CH1 PB.6 D0
UART0_TXD PWM0_CH5 PWM0_CH3 PWM0_CH1 PB.4 D1
NC D2
PWM0_CH5 PWM0_CH3 PWM0_CH1 PC.3 D3
NC D4
PWM0_CH4 PWM0_CH2 PWM0_CH0 PA.5 D5
PWM0_CH5 PWM0_CH3 PWM0_CH1 PA.4 D6
PWM0_CH4 PWM0_CH2 PWM0_CH0 PA.3 D7
VIN
VSS
VSS
5V
3V
RST
IOREF VDD
NC
A5 NC
A4 NC
A3 PA.2 ADC0_CH2
A2 PC.0 ADC0_CH3
A1 PC.1 ADC0_CH4
A0 PC.2 ADC0_CH5
Figure 3-4 Arduino UNO Compatible Extension Connectors

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Header
NuMaker-M0A23OC
Header
NuMaker-M0A23OC
Compatible to
Arduino UNO
GPIO Pin of
M0A23OC1AC
Compatible to
Arduino UNO
GPIO Pin of
M0A23OC1AC
N
U
3
NU3.1
D0
PB.6
N
U
2
NU2.6
A5
NC
NU3.2
D1
PB.4
NU2.5
A4
NC
NU3.3
D2
NC
NU2.4
A3
PA.2
NU3.4
D3
PC.3
NU2.3
A2
PC.0
NU3.5
D4
NC
NU2.2
A1
PC.1
NU3.6
D5
PA.5
NU2.1
A0
PC.2
NU3.7
D6
PA.4
N
U
1
NU1.8
VIN
-
NU3.8
D7
PA.3
NU1.7
VSS
N
U
4
NU4.1
D8
PA.1
NU1.6
VSS
NU4.2
D9
PA.0
NU1.5
5V
NU4.3
D10
PC.7
NU1.4
3V
NU4.4
D11
PC.5
NU1.3
RST
nRESET
NU4.5
D12
PC.4
NU1.2
IOREF
VDD
NU4.6
D13
PC.6
NU1.1
NC
-
NU4.7
VSS
VSS
NU4.8
VREF
NC
NU4.9
SDA
PB.5
NU4.10
SCL
PB.7
Table 3-3 Arduino UNO Extension Connectors and M0A23OC1AC Mapping GPIO List

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Power Supply Configuration3.4
The NuMaker-M0A23OC is able to adopt multiple power supply. External power source include NU1
Vin (7 V to 12 V), VDD (depending on target chip operating voltage), LIN bus through connector JP8
and PC through USB connector. By using switches and voltage regulator, multiple power domains can
be created on the NuMaker-M0A23OC.
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
M0A21 platform and Nu-Link2-Me.
J2
USB_VBUS
USB connector on NuMaker-M0A23OC supplies 5 V
power from PC to M0A21 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.
JP8
JP8_5VCC
JP8 on NuMaker-M0A23OC supplies 5 V power from
LIN bus to M0A21 platform and Nu-Link2-Me.
Table 3-5 5 V Power Sources

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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 M0A21 platformor ICE chip.
UP1
USB_VBUS
UP1 converts USB_VBUS to 3.3 V and supplies 3.3 V
to M0A21 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
M0A21 platform.
Note: SW2.2 (NU1 3VCC) should be switched to ON.
UP1
JP8_5VCC
UP1 converts JP8_5VCC to 3.3 V and supplies 3.3 V to
M0A21 platform.
Note: SW2.2 (NU1 3VCC) should be switched to ON.
Table 3-6 3.3 V Power Sources
3.4.4 Power Connectors
Table 3-7 presents the power connectors.
Connector
Description
JP1
VDD connector on the NuMaker-M0A23OC.
JP2
VSS connector on the NuMaker-M0A23OC.
Table 3-7 Power Connectors

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3.4.5 USB Connectors
Table 3-8 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-M0A23OC for power supply.
Table 3-8 USB Connectors
3.4.6 Power Switches
Table 3-9 presents the power switches.
Switch
Description
ICEJPR1
Configures the target chip operating voltage at 1.8 V / 3.3 V / 5 V.
Note: M0A21 operating voltage range is from 2.4 V to 5.5 V. Do not
switch ICEJPR1 (MCUVCC) to 1.8 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 3-9 Power Switches
3.4.7 Power Supply Models
External Power Supply through Nu-Link2-Me to Target Chip3.4.7.1
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

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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 ICEJ3.
Table 3-10 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
3.3 V
Connect
to PC
3.3 V (default)
3.3 V (default)
3.3 V
Off
X
X
3.3 V
output
2
5 V
Connect
to PC
5 V
3.3 V (default)
3.3 V
Off
X
X
5 V
output
Note:
1. 0 Ω should be soldered between ICEJPR1’s MCUVCC and 3.3 V / 5 V.
2. 0 Ω should be soldered between ICEJPR2’s ICEVCC and 3.3 V.
3. X: Unused.
Table 3-10 Supply External Power through Nu-Link2-Me
External Power Supply through M0A21 platform to Target Chip3.4.7.2
The external power supply sources on M0A21 platform are shown in Figure 3-6.
USB Power Connector (J2)
NU1 pin8 (Vin)
External VDD Connector (JP1)
External VSS Connector (JP2)
LIN Bus Connector (JP8)
Figure 3-6 External Power Supply Sources on M0A21 platform
To use Vin, J2 or JP8 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, J2 or JP8.
To use JP1 as external power supply source, please follow the below steps: