User manual

Preliminary
...the world's most energy friendly microcontrollers
2012-05-15 - TBD 19
www.energymicro.com
Figure 9.4. Trace Header
SWDIO/TMS
SWCLK/TCK
TDI (NC)
nRESET
TRACECLK
TRACE-DATA[0]
TRACE-DATA[1]
SWO/TDO
VTref
GND
NC
GND
NC
NC
GND
GND
GND
GND
TRACE-DATA[2]
TRACE-DATA[3]
1
3
7
9
11
13
15
5
17
19
2
4
8
10
12
14
16
6
18
20
Table 9.3. Trace header pinout
Pin
number
Function Note
1 VTref Target reference voltage.
2 SWDIO/TMS Serial Wire Data Input/Output
4 SWCLK/TCK Serial Wire Clock input
6 SWO/TDO Serial Wire Output trace port
8 TDI Not Connected on the EFM32GG-STK3700
10 nRESET Target CPU reset signal.
12 TRACECLK Trace clock output. Trace clock = 1/2 CPU clock.
14 TRACE-DATA[0] Trace data output pin 0.
16 TRACE-DATA[1] Trace data output pin 1.
18 TRACE-DATA[2] Trace data output pin 2.
20 TRACE-DATA[3] Trace data output pin 3.
7, 11, 13 NC Not Connected
3, 5, 9,
15, 17,
19
GND
Note
The EFM32GG-STK3700 debugger does not contain any trace functionality apart from
the basic functionality provided with Serial Wire View (SWV). This header is only useful
together with an external trace emulator.