UG-498
ADuCM320 Hardware Reference Manual
Rev. C | Page 196 of 196
SERIAL WIRE DEBUG INTERFACE
Serial wire debug (SWD) provides a debug port for pin limited packages. SWD replaces the 5-pin JTAG port with a clock (SWDCLK) and
a single bidirectional data pin (SWDIO), providing all the normal JTAG debug and test functionality. SWDIO and SWCLK are overlaid
on the TMS and TCK pins on the ARM 20-pin JTAG interface.
1
2
V
CC
V
CC
(OPTIONAL)
3
4
NYU
GND
5
6
NYU
GND
7
8
SWDIO
GND
9
10
SWCLK
GND
11
12
NYU
GND
13
14
SWO
GND
15
16
RESET
GND
17
18
NYU
GND
19
20
NYU
GND
1
1
17
6-
03
8
Figure 40. SWD 20-Pin Connector Pinout
Table 302. SWD Connections
Signal Connect
To
SWDIO
Data I/O pin. Use a 100 kΩ pull-up resistor to VCC.
SWO No
connect.
SWCLK
Clock pin. Use a 100 kΩ pull-up resistor to VCC.
VCC
Positive supply voltage—power supply for JTAG interface drivers.
GND Digital
ground.
RESET No
connect.
I
2
C refers to a communications protocol originally developed by Philips Semiconductors (now NXP semiconductors).
ESD Caution
ESD (electrostatic discharge) sensitive device
. Charged devices and circuit boards can discharge without detection. Although this product features patented or proprietary protection
circuitry, damage may occur on devices subjected to high energy ESD. Therefore, proper ESD precautions should be taken to avoid performance degradation or loss of functionality.
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UG11176-0-1/17(C)