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Application Note 297

Using Serial Wire Viewer to Confirm CPU Speed

Serial Wire Viewer (SWV) is a data trace feature found on many ARM Cortex-M3, M4, M7, M23, and M33 processors. This note describes how to take advantage of the UART communications capabilities in the CoreSight™ Serial Wire Viewer to determine the CPU frequency. SWV Data trace frames are output on the Serial Wire Output (SWO) pin at a bit rate that is a ratio of the CPU core clock. An adjustable divider configures the bit rate of the UART in the range of the debug adapter.

APNT_297_V1.2.PDF (570K)
Monday, April 16, 2018
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