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tripwire

Oddness when using Launchpad as external programmer

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Hi,

 

Thanks to the tips on 43oh.com I just managed to use my launchpad to program a 2553 on a breadboard.

 

My code deployed fine and ran without issues, but I noticed something slightly different when I was finished testing. The chip stopped running the code as soon as I terminated the debug session.

 

Normally, when the debugger is connected to a chip on the launchpad's emulation section, terminating just detaches the debugger. Assuming the debugger wasn't paused or on a breakpoint the chip continues to run the code uploaded to it.

 

Could I have done something on my breadboard that's causing the chip to reset as soon as the debugger detaches? I have a 47k pullup resistor and 1nF pulldown cap on RST, and am connecting the launchpad to the breadboard with wires from J3 and J6.

 

Thanks!

 

EDIT: Ignore me! I just realised that I'd connected the decoupling capacitors all kinds of wrong. I think the 2553 must have been running on parasitic power from one of the programming pins!

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