- Thu Feb 15, 2018 8:30 pm
#198338
Anyone know what to do with the KEY signal on a 10 pin connector? I've seen suggestions it can just be grounded, but I'm concerned this might short out a programmer. (I use a Flyswatter 2 with OpenOCD)
In the past I've used 20 and 14 pin JTAG but would like to reduce it to 10 to save board space (without going Tag-Connect) and fall in line with current recommendations.
This is for an LPC4078. Three options I can think of:
* Leave it floating
* Ground it
* Connect it to P2.10, the ISP enable pin (which currently has a weak 100k pullup on my board since I don't ever use the boot ROM).
I have a vague suspicion it's really intended for the third option... but if NOT and I connect it there it could make the board get stuck in the ISP on boot.
I can't seem to find ANY documentation discussing this...
Anyone know?
Will OpenOCD ever use it?
Is it electrically connected when adapted to a 20 pin programmer like the Flyswatter 2?
In the past I've used 20 and 14 pin JTAG but would like to reduce it to 10 to save board space (without going Tag-Connect) and fall in line with current recommendations.
This is for an LPC4078. Three options I can think of:
* Leave it floating
* Ground it
* Connect it to P2.10, the ISP enable pin (which currently has a weak 100k pullup on my board since I don't ever use the boot ROM).
I have a vague suspicion it's really intended for the third option... but if NOT and I connect it there it could make the board get stuck in the ISP on boot.
I can't seem to find ANY documentation discussing this...
Anyone know?
Will OpenOCD ever use it?
Is it electrically connected when adapted to a 20 pin programmer like the Flyswatter 2?