NuMaker-M251SD
Aug.
18, 2020
Page
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Rev 1.00
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Nu-Link2-Me
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 3-19 presents how to set the VCOM function by ICESW2.
3.11.1 VCOM Switches
Table 3-19 presents how to set the VCOM function by ICESW2.
ICESW2
Pin
Function
Description
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 3-19 VCOM Function of Nu-Link2-Me
3.11.2 Status LEDs
Table 3-20 presents the status LEDs patterns for different operation on Nu-Link2-Me.
Operation Status
Status LED
ICES0
ICES1
ICES2
ICES3
Power on
Flash x 3
Flash x 3
Flash x 3
Flash x 3
Connected to IDE/NuTool
Flash x 3
Flash x 3
Flash x 3
On
ICE online (Not connected to a target chip)
On
-
Flash x 3
Flash x 3
ICE online (Connected to a target chip)
On
-
-
On
ICE online (Failed to connect to a target chip)
On
Any
Flash
On
During Offline Programming
-
On
-
Flash
Offline Programming Completed
On
-
-
-
Offline Programming Completed (Auto mode)
On
On
-
-
Offline Programming Failed
On
Flash
-
-
Table 3-20 Operation Status LED Patterns