A clock block is a clock component . This Component can be found in the components on the right side of the Psoc Creator window when you are in the top design.
Thanks for your reply.
The TCPWM is driven by a clock component. The clock component is configured to feed the external clock.
And the confusing thing is, that the error says, the TCPWM is driven by "ClockBlock:dsi_in_1" but requires a clock from the clock block?
It will not be possible to use external clock directly to that fixed function block until it is not kept as device clock. I can suggest you 3 ways to avoid this problem,
1. Use the UDB implementation of the the PWM. In that case you any of the GPIO as the input to the component. The external clock can be given through that pin. You may have to the the firmware code with correct API's.
2. Use the external clock as input to the whole system. If you don't want a lower(16MHz) clock to run the system, use a 48 MHz external source,finally in the clock component you can select HFCLK and divider value to get the frequency you require.
3. Another low cost solution is to use WCO. You can connect it externally(32.768kHz) and in the IMO you choose "Trim with" option to be WCO. You can see the accuracy changing from 2% to 0.2%.
I hope this answer helps.