NuMaker-M251KG
Aug.
08, 2020
Page
26
of 49
Rev 1.00
NuMa
k
er
-M
25
1
K
G
U
S
E
R
MA
NU
A
L
Ma
k
er Nu
-m
be
d
NUC
47
2
Us
er Man
ua
l
Push-Buttons
Table 3-17 presents the push-buttons.
Component
Comment
ICESW1
Off-line program button to start off-line programming the target chip.
SW1
Reset button to reset the target chip.
Table 3-17 Push-Buttons
LEDs
Table 3-18 presents the LEDs.
Component
Comment
Power LED
The power LED indicates that the NuMaker-M251KG is powered.
PB14 LED
The LED is connected to the target chip PB.14.
ICES0, ICES1, ICES2
and ICES3
Nu-Link2-Me status LED.
Table 3-18 LEDs
Nu-Link2-Me
he Nu-Link2-Me is an attached on-board debugger and programmer. The Nu-Link2-Me supports on-
chip debugging, online and offline ICP programming through SWD interface. The Nu-Link2-Me also
supports virtual COM port (VCOM) 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. For more information
about Nu-Link2-Me, please refer to Nu-Link2-Pro Debugger and Programmer User Manual.
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
