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Systems of techniques for controlling charge flow during the electrical stimulation of tissue. In one aspect, a method includes receiving a charge setting describing an amount of charge that is to flow during a stimulation pulse that electrically stimulates a tissue, and generating and delivering th

Systems of techniques for controlling charge flow during the electrical stimulation of tissue. In one aspect, a method includes receiving a charge setting describing an amount of charge that is to flow during a stimulation pulse that electrically stimulates a tissue, and generating and delivering the stimulation pulse in a manner such that an amount of charge delivered to the tissue during the stimulation pulse accords with the charge setting.

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1. A system, comprising: memory configured to store a charge setting value that quantifies, in terms of electrical charge, an amount of electrical charge that is to flow during a stimulation pulse; anda waveform generator configured to generate and deliver the stimulation pulse in a manner such that

1. A system, comprising: memory configured to store a charge setting value that quantifies, in terms of electrical charge, an amount of electrical charge that is to flow during a stimulation pulse; anda waveform generator configured to generate and deliver the stimulation pulse in a manner such that an amount of charge delivered to tissue during the stimulation pulse is equal to the stored charge setting value. 2. The system of claim 1, wherein each of the stored charge setting value and the amount of charge delivered to the tissue is an absolute value. 3. The system of claim 1, wherein each of the stored charge setting value and the amount of charge delivered to the tissue is an incremental or decremental value. 4. The system of claim 1, wherein the waveform generator is configured to generate a stimulation waveform that includes the stimulation pulse and a secondary pulse, the secondary pulse to reduce accumulation of charge at an electrode that has delivered the stimulation pulse. 5. The system of claim 1, further comprising an extracorporeal user interface configured to receive the charge setting value from a user. 6. The system of claim 2, further comprising an implantable stimulator containing the memory and the waveform generator. 7. The system of claim 1, wherein the waveform generator has a trigger input for receiving a trigger, the waveform generator configured to terminate the generation of the stimulation pulse upon receipt of the trigger, the system further comprising a coulomb counter configured to measure an amount of charge delivered in the stimulation pulse and to generate the trigger when the value of charge delivered to the tissue is substantially equal to the stored charge setting value, the coulomb counter having a trigger output for conveying the trigger to the trigger input of the waveform generator. 8. The system of claim 1, further comprising a converter configured to convert the stored charge setting value into one or more stimulation parameters characterizing aspects of the stimulation pulse that is to be delivered to the tissue, wherein the waveform generator is configured to generate the stimulation pulse in accordance with the stimulation parameters. 9. The system of claim 8, wherein the converter is configured to calculate a duration of the stimulation pulse based on a pulse amplitude of the stimulation pulse. 10. The system of claim 8, further comprising a data compilation storing predetermined charge setting values and corresponding predetermined stimulation pulse durations and amplitudes, wherein the converter is configured to access the data compilation to convert the stored charge setting value into the one or more stimulation parameters. 11. The system of claim 8, wherein the converter is configured to convert the stored charge setting value by holding one of a stimulation pulse amplitude and a stimulation pulse duration substantially constant for two or more different charge settings, and determining the other of the stimulation pulse amplitude and the stimulation pulse duration based on the stored charge setting value and the substantially constant one of the stimulation pulse amplitude and the stimulation pulse duration. 12. A system, comprising: an extracorporeal user interface configured to receive a charge setting value that quantifies, in terms of electrical charge, an amount of electrical charge that is to flow during a stimulation pulse; andan implantable stimulator configured to generate and deliver the stimulation pulse in a manner such that an amount of charge delivered to tissue during the stimulation pulse is equal to the charge setting value. 13. The system of claim 12, wherein each of the charge setting value and the amount of charge delivered to the tissue is an absolute value. 14. The system of claim 12, wherein each of the charge setting value and the amount of charge delivered to the tissue is an incremental or decremental value. 15. The system of claim 12, wherein the implantable stimulator is configured to generate a stimulation waveform that includes the stimulation pulse and a secondary pulse, the secondary pulse to reduce accumulation of charge at an electrode that has delivered the stimulation pulse. 16. The system of claim 12, wherein the implantable stimulator is configured to measure an amount of charge delivered in the stimulation pulse, and to terminate the generation of the stimulation pulse when the value of charge delivered to the tissue is equal to the charge setting value. 17. The system of claim 12, wherein one of the extracorporeal user interface and the implantable stimulator is configured to convert the charge setting value into one or more stimulation parameters characterizing aspects of the stimulation pulse that is to be delivered to the tissue, wherein the implantable stimulator is configured to generate the stimulation pulse in accordance with the stimulation parameters. 18. The system of claim 17, wherein the one of the extracorporeal user interface and the implantable stimulator is configured to calculate a duration of the stimulation pulse based on a pulse amplitude of the stimulation pulse. 19. The system of claim 17, wherein the one of the extracorporeal user interface and the implantable stimulator is configured to store predetermined charge setting values and corresponding predetermined stimulation pulse durations and amplitudes, and to access the data compilation to convert the charge setting values into the one or more stimulation parameters. 20. The system of claim 17, wherein the one of the extracorporeal user interface and the implantable stimulator is configured to convert the charge setting value by holding one of a stimulation pulse amplitude and a stimulation pulse duration substantially constant for two or more different charge settings, and determining the other of the stimulation pulse amplitude and the stimulation pulse duration based on the charge setting value and the substantially constant one of the stimulation pulse amplitude and the stimulation pulse duration.