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Enable 4-Pin Trace (ETM)

To enable CoreSight ETM tracing on Toshiba TMPM330 devices:

  • Connect ULINKpro to the board's Cortex Debug+ETM connector and to the host computer.
  • Enable the Trace Port Interface as described in the manual 32-bit RISC Microprocessor - TMPM330 Family chapter Port A (PA0-PA7).
  • Configure µVision to capture ETM trace data.

Enable the Trace Port Interface

  1. Create a text file, for example conf_TMPM330.ini, and enter the following code:
    ** Define the function to enable the trace port
    FUNC void EnableTPIU(void) {
      _WDWORD(0x40000008, 0x0000007F);     // Configure port A pins as trace output using PAFR1.
      _WDWORD(0x40000004, 0x0000007D);     // Enable output on port A using PACR.
    ** Invoke the function at debugger startup
    ** Execute upon software RESET
    FUNC void OnResetExec(void)  {

    On TMPM330 devices, port A is used for debugging and tracing. RESET configures PA0 and PA1 as debug pins, and PA2 through PA7 as general-purpose port pins.

    ETM TRACEDATA[0..3] are output on the pins PA3 through PA6. The trace clock is configured on pin PA2. The Port Function Register, PAFR1, selects the port function, whereas the Port Control Register, PACR, enables port A pins as output or input pins.  These pins have to be reprogrammed after each RESET.

    Use the _WDWORD command to configure the PAFR1 and PACR registers.

    The special function OnResetExec() executes upon software RESET. Refer to TPUI Initialization after RESET (Cortex-M) for details.

  2. Open the dialog Options for Target — Debug and insert conf_TMPM330.ini into the field Initialization File.

    Configure the device for tracing

Configure µVision to capture ETM trace data

  1. Enable Use, select ULINK Pro Cortex Debugger, and click Settings to open the Target Driver Setup dialog.

    Select ULINKpro as the debugger adapter

  2. Click the Trace tab.

    Options for ETM trace

  3. The Core Clock must correspond to the device configuration.
  4. Optionally, enable Unlimited Trace to navigate through the complete data stream history. Make sure to enable this option when measuring the system's energy consumption with PowerScale.
  5. Set Trace Port to Sync Trace Port with 4-bit Data.
  6. Set Trace Enable and ETM Trace Enable.

Start the debugging session and verify the captured trace data with a µVision window.


  • Use the examples delivered with the Keil board MCBTMPM330 as a reference.
  • ETM tracing works in Serial Wire Debug as well as in JTAG Debug mode.
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