Nuvoton NuMicro 8051 Series User manual

NuMaker-ML51SD
Mar. 08, 2021 Page 1of 38 Rev 1.01
NUMAKER-ML51SD1AE USER MANUAL
Maker Nu-mbed NUC472 User Manual
1T 8051
8-bit Microcontroller
NuMaker-ML51SD
User Manual
NuMicro®8051 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
2Features .............................................................................................7
3Hardware Configuration...........................................................................8
Front View............................................................................................... 8
Rear View............................................................................................... 9
Extension Connectors................................................................................10
3.3.1 Pin Assignment for Extension Connectors................................................................ 10
3.3.2 Arduino UNO Compatible Extension Connectors ....................................................... 13
Power Supply Configuration ........................................................................15
3.4.1 VIN Power Source............................................................................................ 15
3.4.2 5 V Power Sources ........................................................................................... 15
3.4.3 3.3 V Power Sources......................................................................................... 16
3.4.4 1.8 V Power Sources......................................................................................... 16
3.4.5 Power Connectors............................................................................................ 16
3.4.6 USB Connectors .............................................................................................. 17
3.4.7 Power Switches............................................................................................... 17
3.4.8 Power Supply Models........................................................................................ 17
External Reference Voltage Connector ...........................................................20
Ammeter Connector..................................................................................20
Push Buttons ..........................................................................................21
LEDs....................................................................................................21
Nu-Link2-Me...........................................................................................21
3.9.1 VCOM Switches............................................................................................... 22
3.9.2 Status LEDs ................................................................................................... 22
4Quick Start ........................................................................................ 23
Toolchains Supporting ...............................................................................23
Nuvoton Nu-Link Driver Installation................................................................23
BSP Firmware Download............................................................................25
Hardware Setup.......................................................................................25
Find the Example Project............................................................................27
Execute the Project under Toolchains.............................................................27
4.6.1 Keil C51 ........................................................................................................ 27
4.6.2 IAR EW8051................................................................................................... 31

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5NuMaker-ML51SD Schematics................................................................ 33
Nu-Link2-Me...........................................................................................33
ML51 platform.........................................................................................34
Extension Connector.................................................................................35
PCB Placement .......................................................................................36
6REVISION HISTORY............................................................................ 37

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List of Figures
Figure 1-1 NuMaker-ML51SD Development Board......................................................................... 6
Figure 3-1 Front View of NuMaker-ML51SD.................................................................................... 8
Figure 3-2 Rear View of NuMaker-ML51SD.................................................................................... 9
Figure 3-3 ML51SD1AE Extension Connectors............................................................................. 10
Figure 3-4 Arduino UNO Compatible Extension Connectors......................................................... 13
Figure 3-5 External Power Supply Sources on Nu-Link2-Me........................................................ 17
Figure 3-6 External Power Supply Sources on ML51 platform...................................................... 18
Figure 3-7 Detach the Nu-Link2-Me from NuMaker-ML51SD ....................................................... 19
Figure 3-8 Wiring between Ammeter Connector and Ammeter..................................................... 21
Figure 4-1 Nu-Link USB Driver Installation Setup.......................................................................... 23
Figure 4-2 Nu-Link USB Driver Installation.................................................................................... 24
Figure 4-3 Open VCOM Function .................................................................................................. 25
Figure 4-4 ICE USB Connector...................................................................................................... 25
Figure 4-5 Device Manger.............................................................................................................. 26
Figure 4-6 PuTTY Session Setting................................................................................................. 26
Figure 4-7 Template Project Folder Path....................................................................................... 27
Figure 4-8 Warning Message of “Device not found” ...................................................................... 27
Figure 4-9 Project File Migrate to Version 5 Format...................................................................... 28
Figure 4-10 Debugger Setting in Options Window......................................................................... 28
Figure 4-11 Programming Setting in Options Window................................................................... 29
Figure 4-12 Compile and Download the Project............................................................................ 29
Figure 4-13 Keil PK51 Debug Mode .............................................................................................. 30
Figure 4-14 Debug Message on Serial Port Terminal Windows.................................................... 30
Figure 4-15 IAR EW8051 Window................................................................................................. 31
Figure 4-16 Compile and Download the Project............................................................................ 32
Figure 4-17 IAR EW8051 Debug Mode ......................................................................................... 32
Figure 4-18 Debug Message on Serial Port Terminal Windows.................................................... 33
Figure 5-1 Nu-Link2-Me Circuit...................................................................................................... 33
Figure 5-2 ML51 platform Circuit.................................................................................................... 34
Figure 5-3 Extension Connectors Circuit ....................................................................................... 35
Figure 5-4 Front Placement ........................................................................................................... 36
Figure 5-5 Rear Placement............................................................................................................ 36

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List of Tables
Table 3-1 Extension Connectors.................................................................................................... 10
Table 3-2 ML51SD1AE Full-pin Extension Connectors and GPIO Function List .......................... 12
Table 3-3 Arduino UNO Extension Connectors and ML51SD1AE Mapping GPIO List................. 14
Table 3-4 Vin Power Source.......................................................................................................... 15
Table 3-5 5 V Power Sources........................................................................................................ 15
Table 3-6 3.3 V Power Sources..................................................................................................... 16
Table 3-7 1.8 V Power Sources..................................................................................................... 16
Table 3-8 Power Connectors ......................................................................................................... 16
Table 3-9 USB Connectors ............................................................................................................ 17
Table 3-10 Power Switches ........................................................................................................... 17
Table 3-11 Supply External Power through Nu-Link2-Me ............................................................. 18
Table 3-12 Supply External Power for ML51 platform................................................................... 20
Table 3-13 External Reference Voltage Connector....................................................................... 20
Table 3-14 Ammeter Connector..................................................................................................... 20
Table 3-15 Push-Buttons ............................................................................................................... 21
Table 3-16 LEDs ............................................................................................................................ 21
Table 3-17 VCOM Function of Nu-Link2-Me.................................................................................. 22
Table 3-18 Operation Status LED Patterns ................................................................................... 22

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1 OVERVIEW
The NuMaker-ML51SD is a development board for Nuvoton NuMicro®ML51 series microcontrollers.
The NuMaker-ML51SD consists of two parts: an ML51 platform and an on-board Nu-Link2-Me
debugger and programmer. The NuMaker-ML51SD is designed for project evaluation, prototype
development and validation with power consumption monitoring function.
The ML51 platform is based on NuMicro®ML51SD1AE. For the development flexibility, the ML51
platform provides the extension connectors of ML51SD1AE, 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 ML51 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-ML51SD Development Board

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2 FEATURES
NuMicro®ML51SD1AE microcontroller with function compatible with:
ML51TD1AE
ML51LD1AE
ML51SD1AE 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 ML51 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 View
ICE USB Connector
VCOM Switch
Reset Button
ICE Status LED
Off-line Program Button
USB PWR Connector
Power LED
P3.2 LED
VDD Switch
ML51SD1AE ML51SD1AE Extension Connectors
Arduino UNO Compatible Extension Connectors
External VDD Connector
Nu-Link2-Me
Ammeter
ICE Chip: M48SSIDAE
External VSS Connector
ML51 Platform
External VREF Connector
Figure 3-1 Front View of NuMaker-ML51SD
Figure 3-1 shows the main components and connectors from the front side of NuMaker-ML51SD. The
following lists components and connectors from the front view:
Target chip: ML51SD1AE (U1)
USB PWR Connector (J2)
Arduino UNO Compatible Extension Connectors (NU1, NU2, NU3, NU4)
ML51 Extension Connectors (JP3, JP4, JP5 and JP6)
External VDD Power Connector (JP1)
External VSS Power Connector (JP2)
External VREF Connector (VREF)
VDD Switch (SW2)
Ammeter Connector (AMMETER)
Reset Button (SW1)
Power LED and P3.2 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 View
Figure 3-2 shows the main components and connectors from the rear side of NuMaker-ML51SD.
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-ML51SD

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Extension Connectors
Table 3-1 presents the extension connectors.
Connector
Description
JP3, JP4, JP5 and JP6
Full pins extension connectors on the NuMaker-ML51SD.
NU1, NU2, NU3 and NU4
Arduino UNO compatible pins on the NuMaker-ML51SD.
Table 3-1 Extension Connectors
3.3.1 Pin Assignment for Extension Connectors
The NuMaker-ML51SD provides the ML51SD1AE onboard and extension connectors (JP3, JP4, JP5
and JP6). The Figure 3-3 shows the ML51SD1AE extension connectors.
JP3
JP6
Pin49 ~ Pin64
JP5 Pin17 ~ Pin32
JP4 Pin33 ~ Pin48
Pin1 ~ Pin16
Figure 3-3 ML51SD1AE Extension Connectors

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Header
ML51SD1AE
Pin No.
Function
JP3
JP3.1
JP3.2
1
P2.6 / UART1_RXD / PWM3_CH1 / ACMP1_O
JP3.3
JP3.4
2
P2.5 / ADC_CH0 / ACMP0_P0 / ACMP1_P0 / I2C0_SCL / PWM0_CH0 / UART2_TXD / T0 /
INT0
JP3.5
JP3.6
3
P2.4 / ADC_CH1 / ACMP0_N0 / I2C0_SDA / PWM0_CH1 / UART2_RXD / T1 / INT1
JP3.7
JP3.8
4
P2.3 / ADC_CH2 / ACMP0_P1 / ACMP1_P1 / I2C1_SCL / UART1_TXD / PWM0_CH2 /
PWM0_BRAKE
JP3.9
JP3.10
5
P2.2 / ADC_CH3 / ACMP1_N0 / I2C1_SDA / UART1_RXD / PWM0_CH3
JP3.11
JP3.12
6
2.1 / ADC_CH4 / ACMP0_P2 / ACMP1_P2 / UART2_TXD / I2C1_SCL / PWM0_CH4 /
PWM3_CH0 / PWM0_BRAKE
JP3.13
JP3.14
7
P2.0 / ADC_CH5 / ACMP0_N1 / UART2_RXD / I2C1_SDA / PWM0_CH5 / PWM3_CH1 /
PWM0_BRAKE
JP3.15
JP3.16
8
P1.3 / IC0
JP3.17
JP3.18
9
P1.2 / UART3_TXD / IC1
JP3.19
JP3.20
10
P1.1 / UART3_RXD / UART1_TXD / IC2
JP3.21
JP3.22
11
P1.0 / UART1_RXD / IC0
JP3.23
JP3.24
12
P3.7 / SPI1_MOSI
JP3.25
JP3.26
13
P5.7 / PWM0_BRAKE / PWM0_CH4 / CLKO
JP3.27
JP3.28
14
P5.5 / UART2_RXD / PWM0_CH0 / X32_IN / STADC
JP3.29
JP3.30
15
P5.4 / UART2_TXD / PWM0_CH1 / X32_OUT
JP3.31
JP3.32
16
P5.3 / UART0_TXD / I2C0_SCL / XT1_IN
JP5
JP5.1
JP5.2
17
P5.2 / UART0_RXD / I2C0_SDA / XT1_OUT
JP5.3
JP5.4
18
P3.5 / PWM2_CH0 / T0
JP5.5
JP5.6
19
P3.4 / PWM2_CH1 / T1
JP5.7
JP5.8
20
P0.7 / UART0_TXD / I2C1_SCL / PWM3_CH0 / INT1
JP5.9
JP5.10
21
P0.6 / UART0_RXD / I2C1_SDA / PWM3_CH1 / INT0
JP5.11
JP5.12
22
VSS
JP5.13
JP5.14
23
VDD
JP5.15
JP5.16
24
P3.6 / PWM0_CH5 / INT1
JP5.17
JP5.18
25
P0.5 / UART0_TXD / I2C0_SCL / PWM0_CH0
JP5.19
JP5.20
26
P0.4 / UART0_RXD / I2C0_SDA / PWM0_CH1
JP5.21
JP5.22
27
P0.3 / SPI0_SS / SPI1_SS / UART1_TXD / I2C1_SCL / STADC / PWM0_CH2 / CLKO
JP5.23
JP5.24
28
P0.2 / SPI0_CLK / SPI1_CLK / UART1_RXD / I2C1_SDA / PWM0_CH3
JP5.25
JP5.26
29
P0.1 / SPI0_MISO / SPI1_MISO / UART2_RXD / UART0_TXD / PWM0_CH4
JP5.27
JP5.28
30
P0.0 / SPI0_MOSI / SPI1_MOSI / UART2_TXD / UART0_RXD / PWM0_CH5
JP5.29
JP5.30
31
P5.6 / PWM0_BRAKE / PWM0_CH1 / CLKO

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JP5.31
JP5.32
32
nRESET
JP4
JP4.1
JP4.2
33
P5.0 / UART1_TXD / I2C1_SCL / UART0_TXD / ICE_DAT
JP4.3
JP4.4
34
P5.1 / UART1_RXD / I2C1_SDA / UART0_RXD / ICE_CLK
JP4.5
JP4.6
35
P4.5 / UART2_TXD / I2C1_SCL / PWM1_CH0
JP4.7
JP4.8
36
P4.4 / UART2_RXD / I2C1_SDA / PWM1_CH1
JP4.9
JP4.10
37
P4.3 / PWM2_CH0
JP4.11
JP4.12
38
P4.2 / PWM2_CH1
JP4.13
JP4.14
39
P4.1 / UART2_TXD / I2C0_SCL / PWM3_CH0 / ACMP0_O
JP4.15
JP4.16
40
P4.0 / UART2_RXD / I2C0_SDA / PWM3_CH1 / ACMP1_O / INT1
JP4.17
JP4.18
41
P6.3 / SPI0_SS / UART0_TXD
JP4.19
JP4.20
42
P6.2 / UART3_TXD / SPI0_CLK / UART0_RXD
JP4.21
JP4.22
43
P6.1 / UART3_RXD / SPI0_MISO
JP4.23
JP4.24
44
P6.0 / SPI0_MOSI
JP4.25
JP4.26
45
P1.4 / I2C1_SCL
JP4.27
JP4.28
46
P1.5 / I2C1_SDA
JP4.29
JP4.30
47
P1.6 / UART0_TXD
JP4.31
JP4.32
48
P1.7 / UART0_RXD
JP6
JP6.1
JP6.2
49
VSS
JP6.3
JP6.4
50
P4.6 / PWM0_CH0 / T0 / CLKO / INT0
JP6.5
JP6.6
51
VDD
JP6.7
JP6.8
52
P4.7 / T1
JP6.9
JP6.10
53
P3.3 / SPI1_SS / PWM1_CH0 / IC0 / PWM0_BRAKE
JP6.11
JP6.12
54
P3.2 / ADC_CH7 / ACMP1_N1 / SPI1_CLK / UART3_RXD / PWM1_CH1 / IC1 / CLKO
JP6.13
JP6.14
55
P3.1 / ADC_CH6 / ACMP0_P3 / ACMP1_P3 / SPI1_MISO / UART3_TXD / UART0_TXD /
PWM2_CH0 / IC2
JP6.15
JP6.16
56
P3.0 / ADC_CH10 / SPI1_MOSI / UART0_RXD / PWM2_CH1 / IC0
JP6.17
JP6.18
57
AVDD
JP6.19
JP6.20
58
VREF
JP6.21
JP6.22
59
AVSS
JP6.23
JP6.24
60
P6.7 / ADC_CH11 / I2C1_SCL
JP6.25
JP6.26
61
P6.6 / ADC_CH12 / I2C1_SDA
JP6.27
JP6.28
62
P6.5 / ADC_CH13 / UART0_TXD
JP6.29
JP6.30
63
P6.4 / ADC_CH14 / UART0_RXD
JP6.31
JP6.32
64
P2.7 / ADC_CH15 / UART1_TXD / PWM3_CH0 / ACMP0_O
Table 3-2 ML51SD1AE 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.
VSS
VREF
PWM3_CH1 P4.0 SDA
PWM3_CH0 P4.1 SCL
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
UART1_RXD PWM0_CH3 P2.2 D0
UART1_TXD PWM0_CH2 P2.3 D1
I2C1_SDA PWM1_CH1 P4.4 D2
I2C1_SCL PWM1_CH0 P4.5 D3
PWM2_CH0 P4.3 D4
PWM2_CH1 P4.2 D5
PWM3_CH0 P0.7 D6
PWM3_CH1 P0.6 D7
VIN
VSS
VSS
5V
3V
RST
IOREF VDD
NC
A5 P2.1 ADC_CH4 I2C1_SCL UART2_TXD
A4 P2.0 ADC_CH5 I2C1_SDA UART2_RXD
A3 P2.4 ADC_CH1
A2 P2.5 ADC_CH0
A1 P2.6 UART1_RXD
A0 P2.7 ADC_CH15 UART1_TXD
Figure 3-4 Arduino UNO Compatible Extension Connectors

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Header
NuMaker-ML51SD
Header
NuMaker-ML51SD
Compatible to
Arduino UNO
GPIO Pin of ML51
Compatible to
Arduino UNO
GPIO Pin of ML51
N
U
3
NU3.1
D0
P2.2
N
U
2
NU2.6
A5
P2.1
NU3.2
D1
P2.3
NU2.5
A4
P2.0
NU3.3
D2
P4.4
NU2.4
A3
P2.4
NU3.4
D3
P4.5
NU2.3
A2
P2.5
NU3.5
D4
P4.3
NU2.2
A1
P2.6
NU3.6
D5
P4.2
NU2.1
A0
P2.7
NU3.7
D6
P0.7
N
U
1
NU1.8
VIN
-
NU3.8
D7
P0.6
NU1.7
VSS
N
U
4
NU4.1
D8
P0.5
NU1.6
VSS
NU4.2
D9
P0.4
NU1.5
5V
NU4.3
D10
P0.3
NU1.4
3V
NU4.4
D11
P0.0
NU1.3
RST
nRESET
NU4.5
D12
P0.1
NU1.2
IOREF
VDD
NU4.6
D13
P0.2
NU1.1
NC
-
NU4.7
VSS
VSS
NU4.8
VREF
VREF
NU4.9
SDA
P4.0
NU4.10
SCL
P4.1
Table 3-3 Arduino UNO Extension Connectors and ML51SD1AE Mapping GPIO List

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Power Supply Configuration
The NuMaker-ML51SD 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-
ML51SD.
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
ML51 platform and Nu-Link2-Me.
J2
USB_VBUS
USB connector on NuMaker-ML51SD supplies 5 V
power from PC to ML51 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: ML51 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

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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 ML51 platformor ICE chip.
UP1
USB_VBUS
UP1 converts USB_VBUS to 3.3 V and supplies 3.3 V
to ML51 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
ML51 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 ML51 platformor 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-ML51SD.
Note: ML51SD1AE operating voltage range is from 1.8 V to 3.6 V.
JP2
VSS connector on the NuMaker-ML51SD.
Table 3-8 Power Connectors

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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-ML51SD 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: ML51SD1AE 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: ML51SD1AE 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 Chip
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 3-11 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
X
X
1.8 V
output
2
3.3 V
Connect
to PC
3.3 V (default)
3.3 V (default)
3.3 V
Off
X
X
3.3 V
output
3
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 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.
3. X: Unused.
Table 3-11 Supply External Power through Nu-Link2-Me
External Power Supply through ML51 platform to Target Chip
The external power supply sources on ML51 platform are shown in Figure 3-6.
USB Power Connector (J2)
NU1 pin8 (Vin)
External VDD Connector (JP1)
External VSS Connector (JP2)
Figure 3-6 External Power Supply Sources on ML51 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.

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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.
To use Vin or J2 as external power supply source with Nu-Link2-Me detached from NuMaker-
ML51SD, please follow the below steps:
1. Switch the SW2 depends on the target chip operating voltage.
2. Detach the Nu-Link2-Me from NuMaker-ML51SD.
3. Connect the external power supply to Vin or J2.
To use JP1 as external power supply source with Nu-Link2-Me detached from NuMaker-ML51SD,
please follow the below steps:
1. Switch the SW2 to OFF.
2. Detach the Nu-Link2-Me from NuMaker-ML51SD.
3. Connect the external power supply to JP1.
USB Power Connector (J2)
NU1 pin8 (Vin)
External VDD Connector (JP1)
External VSS Connector (JP2) Detach Nu-Link2-Me
"
"
Figure 3-7 Detach the Nu-Link2-Me from NuMaker-ML51SD

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Table 3-12 presents all power models when supplies external power through ML51 platform. The
ML51 platform external power sources are highlighted in yellow.
Model
Target Chip
Voltage
Vin [1]
J2[1]
ICEJ3
SW2
Selection
JP1[2]
ICEJPR1
(MCUVCC)
Selection [3]
ICEJPR2
(ICEVCC)
Selection [4]
ICE Chip
Voltage [5]
4
3.3 V
7 V ~ 12 V
Input
X
X
NU1
3VCC
3.3 V output
Remove
resistor
3.3 V
3.3 V
5
3.3 V
X
Connect
to PC
X
NU1
3VCC
3.3 V output
Remove
resistor
3.3 V
3.3 V
6
5 V
7 V ~ 12 V
Input
X
X
NU1
5VCC
5 V output
Remove
resistor
3.3 V
3.3 V
7
5 V
X
Connect
to PC
X
NU1
5VCC
5 V output
Remove
resistor
3.3 V
3.3 V
8
1.8 V ~ 3.6 V
X
X
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
X
X
Nu-Link2-Me
removed
OFF
DC Input
1.8 V ~ 3.6 V
X
X
X
Note:
1. The Vin input voltage will be converted by voltage regulator UP2 to 5 V. Supply external power to Vin or J2 can provide 5 V
to NU1 pin5 (5V) and 3.3 V to NU1 pin4 (3VCC).
2. JP1 external power input only provides voltage to target chip.
3. 0 Ω should be removed from ICEJPR1’s MCUVCC and 1.8 V / 3.3 V / 5 V.
4. 0 Ω should be soldered between ICEJPR2’s ICEVCC and 1.8 V / 3.3 V.
5. The ICE chip voltage should be close to the target chip voltage.
6. X: Unused
Table 3-12 Supply External Power for ML51 platform
External Reference Voltage Connector
Table 3-14 presents the external reference voltage connector.
Connector
Description
VREF
Connector for user to connect to the external reference voltage pin of the
target chip. User needs to remove the L5 ferrite bead.
Table 3-13 External Reference Voltage Connector
Ammeter Connector
Table 3-14 presents the ammeter connector.
Connector
Description
AMMETER
Connector for user to measure the target chip power consumption easily.
User needs to remove the R16 resistor.
Table 3-14 Ammeter Connector