Program a PIC Processor In-Circuit Using a 3.3-V Supply (.PDF Download)

Many PIC processors require 5-V power while being programmed, yet battery-powered systems may contain low-voltage devices that will be damaged at voltages above their maximum voltage ratings. In addition, application circuits may draw more current than the programming device can source, so unpowered circuits operating on 5 V may require isolation between the programming device and the application circuit. These situations require isolation of the application circuit (and the battery itself,

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