Knowledge Base Article
Answer: In some PSoC 5 applications, a MHz ECO is needed to provide a more accurate clock reference. The kHz ECO requires configuration in both hardware and firmware. Both configuration steps are detailed below.
Note PSoC 5LP has a more accurate IMO than PSoC 5, and does not require an external crystal in as many circumstances.
Hardware Configuration: The MHz crystal and loading capacitors must be installed in the proper locations. The component designators and part numbers are shown for each kit in the tables below.
Note The latest versions of these kits ship with the MHz crystal and loading capacitors already installed.
CY8CKIT-050 MHz ECO components:
CY8CKIT-010 MHz ECO components:
Firmware Configuration: The MHz ECO may be configured using the Design Wide Resources interface in PSoC Creator. To enable the MHz ECO, make sure the “XTAL” checkbox in the upper left corner of the “Configure System Clocks” dialog is checked, as shown below. In the XTAL configuration window, configure the MHz crystal as shown below. The clock tree can also be configured to use the MHz ECO as the source for various clocks throughout the part.
More details on PSoC 3, 5, and 5LP MHz and kHz ECOs can be found in AN54439 - PSoC® 3 and PSoC 5LP External Crystal Oscillators.