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Old 21st Oct 2020, 12:01 am   #29
SiriusHardware
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Join Date: Aug 2011
Location: Newcastle, Tyne and Wear, UK.
Posts: 11,483
Default Re: MK14 programming interface - Arduino version

I went looking for the issue VI circuit, blinked, and Slothie had already rocked up with it. Thanks Slothie. I believe Slothie is also working on rev 1.3 of the issue VI as well, although I don't think it is a priority for him as he has several other projects on the go as well.

The lowdown on MK14 reset inputs is:-

- JMP replica, which is reportedly an 'issue 0' clone - active low reset input.
- Original issue II through issue IV - active low reset input.
- Original issue V and Martin L replica - active high reset input.
- Issue VI replica - active low reset input.

Of the above, only the issue VI replica has the reset input already available on the keypad edge connector.

The reset output of the uploader, being opto-isolated, copes perfectly well with either case - on all but issue Vs / Martin L replicas the reset opto collector goes to reset-in and the reset opto emitter goes to 0V.

On the original issue V / Martin replica, +5V and reset-in would have to be made available at the edge connector with the reset opto collector going to +5V and the reset opto emitter going to reset-in.
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