Debug support (DBG) RM0008
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26.16.10 Example of configuration
● Set the bit TRCENA in the Debug Exception and Monitor Control Register (DEMCR)
● Write the TPIU Current Port Size Register to the desired value (default is 0x1 for a 1-bit
port size)
● Write TPIU Formatter and Flush Control Register to 0x102 (default value)
● Write the TPIU Select Pin Protocol to select the sync or async mode. Example: 0x2 for
async NRZ mode (UART like)
● Write the DBGMCU Control Register to 0x20 (bit IO_TRACEN) to assign TRACE I/Os
for async mode. A TPIU Sync packet is emitted at this time (FF_FF_FF_7F)
● Configure the ITM and write the ITM Stimulus register to output a value
0xE0040304
Formatter and
flush control
Bit 31-9 = always ‘0’
Bit 8 = TrigIn = always ‘1’ to indicate that triggers are indicated
Bit 7-4 = always 0
Bit 3-2 = always 0
Bit 1 = EnFCont. In Sync Trace mode (Select_Pin_Protocol
register bit1:0=00), this bit is forced to ‘1’: the formatter is
automatically enabled in continuous mode. In asynchronous
mode (Select_Pin_Protocol register bit1:0 <> 00), this bit can
be written to activate or not the formatter.
Bit 0 = always 0
The resulting default value is 0x102
Note: In synchronous mode, because the TRACECTL pin is not
mapped outside the chip, the formatter is always enabled in
continuous mode -this way the formatter inserts some control
packets to identify the source of the trace packets).
0xE0040300
Formatter and
flush status
Not used in Cortex-M3, always read as 0x00000008
Table 172. Important TPIU registers (continued)
Address Register Description
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