A voltage circuit comprising: a circuit node (14,104); a charge source for providing charge to a voltage generator to be stored onto the circuit node and for receiving charge stored on the circuit node from the voltage generator; the voltage generator coupled between the circuit node and the charge source, the voltage generator including -transistors that are switched to enable current to flow in a first direction from the charge source to the circuit node to charge a first predetermined voltage onto the circuit node for use in a first predetermined function during a first time period, the voltage generator removes a portion of the charge from the circuit node by switching the transistors to conduct current in a second direction from the circuit node to the charge source, and couples the portion of the charge on the circuit node to the charge source for reuse by the charge source during a second time period subsequent to the first time period, characterised in that the transistors include a plurality of series-coupled transistors coupled between the charge source and the circuit node, each having a source, a drain and a control electrode, and wherein and wherein the voltage generator further includes: a charge/discharge switch coupled to the control electrode of each of the plurality of series-coupled transistors, the charge/discharge switch selectively connecting the control electrode to a corresponding drain or a corresponding source of each of the plurality of series-coupled transistors in response to a control signal (UP/DOWN), and a voltage level shifting circuit coupled to the circuit node and having an input for receiving the control signal (UP/DOWN) and an output coupled to the charge/discharge switch for configuring the charge/discharge switch to either charge the circuit node or discharge the circuit node. a circuit node (14,104); a charge source for providing charge to a voltage generator to be stored onto the circuit node and for receiving charge stored on the circuit node from the voltage generator; the voltage generator coupled between the circuit node and the charge source, the voltage generator including -transistors that are switched to enable current to flow in a first direction from the charge source to the circuit node to charge a first predetermined voltage onto the circuit node for use in a first predetermined function during a first time period, the voltage generator removes a portion of the charge from the circuit node by switching the transistors to conduct current in a second direction from the circuit node to the charge source, and couples the portion of the charge on the circuit node to the charge source for reuse by the charge source during a second time period subsequent to the first time period, characterised in that the transistors include a plurality of series-coupled transistors coupled between the charge source and the circuit node, each having a source, a drain and a control electrode, and wherein and wherein the voltage generator further includes: a charge/discharge switch coupled to the control electrode of each of the plurality of series-coupled transistors, the charge/discharge switch selectively connecting the control electrode to a corresponding drain or a corresponding source of each of the plurality of series-coupled transistors in response to a control signal (UP/DOWN), and a voltage level shifting circuit coupled to the circuit node and having an input for receiving the control signal (UP/DOWN) and an output coupled to the charge/discharge switch for configuring the charge/discharge switch to either charge the circuit node or discharge the circuit node. a charge/discharge switch coupled to the control electrode of each of the plurality of series-coupled transistors, the charge/discharge switch selectively connecting the control electrode to a corresponding drain or a corresponding source of each of the plurality of series-coupled transistors in response to a control signal (UP/DOWN), and a voltage level shifting circuit coupled to the circuit node and having an input for receiving the control signal (UP/DOWN) and an output coupled to the charge/discharge switch for configuring the charge/discharge switch to either charge the circuit node or discharge the circuit node.