Bora YILDIZ

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10 years, 10 months ago.

Missing TGT_SWO in Schematics for LPC1768

I have a bit confused about TGT_SWO net. In the schematics I couldn't find any point that "TGT_SWO" net connected. I think this net should be connected to pin18 in LPC11U35FHI33/501. In the LPC11U pin18(TGT_SWO) seems NC. Are there any missing in schematics?

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Last updated: 30 Apr 2020
Board, board design, board layout, custom board, custom hardware, HDK, PCB, Production

1 Answer

Wim Huiskamp
10 years, 10 months ago.

The original mbed lpc1768 does not use an lpc11u35 as the interface chip. Instead it uses an unidentified IF processor (also NXP ARM device) which uses a netname TGT_TDO for the SWO pin 1 from the lpc1768 to the IF. See schematic mbed-005.1.pdf

The more recent Seeed studio Arch_Pro mbed lpc1768 does use the lpc11u35 interface and the TGT_SWO from lpc1768 is connected to pin 18 of the 11u35.

Accepted Answer

Thanks Wim, In the recent "mBed-HDK" file, LPC11U35 pin18 seems not connected. So, I guess there is a little missing in the schematics.

Also WAKE_NREQ(pin26) and SLEEP_NREQ(pin27) are not connected. But they should be already like this if I am not wrong.

posted by Bora YILDIZ 07 Jan 2015