5.7.2.1 SAM ITM Trace
MPLAB ICE 4 is capable of streaming UART-format ITM trace to the host computer. Trace is captured on the TRACE/SWO pin of the 10-pin header (JTAG TDO pin). Data is buffered internally on the MPLAB ICE 4 and is sent over the trace interface to the host computer. The maximum reliable data rate is about 4 MB/s at this time.
Note: You can set the ITM baud rate in MPLAB X IDE. See Set Up ITM in MPLAB X IDE.
The ITM contains the following sub-blocks:
- Timestamp
-
Generates timestamp packet.
- Sync control
-
ITM synchronizer.
- Arbiter
-
Arbitrates between synchronous, timestamp, and SWIT packet.
- FIFO
-
ATB First In First Out (FIFO).
- Emitter
-
ATB registered emitter.
Data is written to the stimulus registers using the APB interface. This data is then transmitted on the ATB interface as SWIT packets .