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iMX1064 Crystal required? SWD support

Question asked by Harjit Singh on Sep 11, 2019

Clocking

My design is severely board space constrained. The latest reference manual (IMXRT1064RM, Rev 0.1, 12/2018), section 14.4.3 RC Oscillator (24 MHz) says:

A lower-power RC oscillator module is available on-chip as a possible alternative to the
24 MHz crystal oscillator after a successful power-up sequence.

 

I don't need precise timing in my system. I'd love to eliminate the external oscillator / crystal and use this built in circuit. Has anyone succeeded in doing this?

 

For the 32kHz, I don't need precision. Section 14.5.1 says:

The internal oscillator is automatically multiplexed in the clocking system when the
system detects a loss of clock.

This gives me hope that I can not use a 32kHz crystal/oscillator and be fine. Yes?

 

SWD

The latest reference manual (IMXRT1064RM, Rev 0.1, 12/2018), section 1.3 says:

• Support for 5-pin (JTAG) and SWD debug interfaces

 

Doing a search for SWD, I can see how to route the signal but I don't see any more details. Does anyone have SWD working?

Thanks in advance.

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