Nu-Link2-Pro Debugger and Programmer
Mar. 13, 2020
Page
19
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Rev 1.00
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Bridge Interface Pin Definition and Function Connection
Table 3.3-1 shows the bridge interface pin definition and description. The Nu-Link2-Pro provides a
bridge interface connector with a 100-mil 20-pin cable. The bridge interface supports one channel
UART, I
2
C, SPI, RS-485, CAN BUS, ADC, PWM and two GPIOs. The following sections will introduce
the definition of the bridge interface pin and the connection of each function.
Pin Name
Pin Number
Pin Description
TXD
CON6.1
Data transmitter output pin for UART
RXD
CON6.2
Data receiver input pin for UART
SCL
CON6.3
I
2
C clock
SDA
CON6.4
I
2
C data input/output
SS
CON6.5
SPI slave select
CLK
CON6.6
SPI serial clock
MOSI
CON6.7
SPI MOSI (Master Out, Slave In)
MISO
CON6.8
SPI MISO (Master In, Slave Out)
RS-485A
CON6.9
RS-485 Data plus signal
RS-485B
CON6.10
RS-485 Data minus signal
CANH
CON6.11
CAN BUS Data plus signal
CANL
CON6.12
CAN BUS Data minus signal
ADC
CON6.13
ADC analog input signal
VCC33
CON6.14
Target Board voltage supply. The Nu-Link2-Pro Bridge VCC
only support 3.3V.
PWM
CON6.15
PWM output/Capture input
VCC33
CON6.16
Target Board voltage supply. The Nu-Link2-Pro Bridge VCC
only support 3.3V.
GPIO0
CON6.17
General Purpose I/O 0
GND
CON6.18
Ground
GPIO1
CON6.19
General Purpose I/O 1
GND
CON6.20
Ground
Table 3.3-1 Bridge
Interface
Pin Definition and Description
UART Connection
The Nu-Link2-Pro provides one channel UART function for monitor mode print out information. This
information is received from I
2
C, SPI, RS-485 or CAN BUS. The UART connection pins are VCC33
(CON6.14 and CON6.16), VSS(CON6.18 and CON6.20), TXD(CON6.1) and RXD(CON6.2). Figure
3.3-1 presents how to connect the target board to use UART function and Table 3.3-2 shows the pin