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LPC51U68 - how to control an SCT input signal from firmware?

Question asked by henning larsen on Apr 8, 2019
Latest reply on Apr 27, 2019 by jeremyzhou

I want to affect the SCT states and events flow from firmware. I.e. generate an event like had the event originated from a pin on the chip but in stead from software.

 

The SCT_IN0,1,2,3 cannot be accessed by firmware in LPC51U68 in the same way as in LPC82x for instance. (see https://community.nxp.com/thread/429717), so no way via firmware to affect the SCT from these pins. See manual for LPC51U68 on page 208:

SCT input signals are predefined. The signals from external pins and internal signals are
connected directly to the SCT inputs and not routed through IOCON.

Then there are the SCT_OUT0,,,7 but again they are inaccessible to the firmware as far as I have been able to read. Once configured as SCT_OUT there is no acces in GPIO mode.

 

This leave only the external wire-bridge option.

 

Is it really true that for LPC51U68, the only way to send signal from firmware to SCT would be via one of the SCT_IN0,1,2 or 3 pins using an external wire bridge from another GPIO pin?

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