Resettable mixin #280
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Resettable mixin #280
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Add external reset pin support to microcontrollers via a Resettable mixin which can be applied to any Block. Refactor VoltageRegulatorEnable to use the Resettable mixin instead.
Resettable defines an optional reset port, which when not connected generates internal reset circuitry to keep the device always enabled, and when connected directly connects the digital reset line (without generating any interface circuitry - it is up to the system designer to create a proper circuit).
Also break up big SWD, by separating out the optional (from the spec points of view) reset line. SWD connector now only defines the base gnd, power, and SWD lines, with reset, SWO, JTAG TDI moved into optional mixins.