SAM3X8E Atmel Corporation, SAM3X8E Datasheet - Page 218

• Manufacturer Part Number: SAM3X8E
• Manufacturer: Atmel Corporation

12.5
12.5.1
12.5.2
Figure 12-4. Debug Architecture
12.5.3
218
218
Functional Description
data address sampler
SAM3X/A
SAM3X/A
Test Pin
Debug Architecture
Serial Wire/JTAG Debug Port (SWJ-DP)
4 watchpoints
interrupt trace
data sampler
CPU statistics
PC sampler
DWT
One dedicated pin, TST, is used to define the device operating mode. When this pin is at low
level during power-up, the device is in normal operating mode. When at high level, the device is
in test mode or FFPI mode. The TST pin integrates a permanent pull-down resistor of about 15
k
low or high level at power up, it must remain in the same state during the duration of the whole
operation.
Figure 12-4
tional units for debug:
The debug architecture information that follows is mainly dedicated to developers of SWJ-DP
Emulators/Probes and debugging tool vendors for Cortex M3-based microcontrollers. For further
details on SWJ-DP see the Cortex M3 technical reference manual.
The Cortex-M3 embeds a SWJ-DP Debug port which is the standard CoreSight
combines Serial Wire Debug Port (SW-DP), from 2 to 3 pins and JTAG debug Port (JTAG-DP),
5 pins.
By default, the JTAG Debug Port is active. If the host debugger wants to switch to the Serial
Wire Debug Port, it must provide a dedicated JTAG sequence on TMS/SWDIO and
TCK/SWCLK which disables JTAG-DP and enables SW-DP.
• SWJ-DP (Serial Wire/JTAG Debug Port)
• FPB (Flash Patch Breakpoint)
• DWT (Data Watchpoint and Trace)
• ITM (Instrumentation Trace Macrocell)
• TPIU (Trace Port Interface Unit)
so that it can be left unconnected for normal operation. Note that when setting the TST pin to
shows the Debug Architecture used in the SAM3. The Cortex-M3 embeds four func-
software trace
time stamping
6 breakpoints
32 channels
FPB
ITM
TPIU
SWD/JTAG
SWO trace
SWJ-DP
11057A–ATARM–17-Feb-12
11057A–ATARM–17-Feb-12
™
debug port. It