| 摘要 |
An electronic device includes an indicator that generates an indication of an event responsive to an indicator control signal from an indicator control circuit coupled between a processor and the indicator. The processor generates an indicator off-time value and an indicator on-time value when an indication is desired, and the indicator control circuit receives the indicator off-time value and the indictor on-time value from the processor. More particularly, the indicator control circuit includes an off-time register, an on-time register, and an indicator control circuit. The off-time register stores the off-time value generated by the processor, and the on-time register stores the on-time value generated by the processor. The indicator control signal generator alternatingly enables the indicator control signal for a period of time determined by the on-time value stored in the on-time register and disables the indicator control signal for a period of time determined by the off-time value stored in the off-time register. The electronic device can also include an indicator pulse-duty register and a pulse width modulation circuit. The indicator pulse-duty register can be coupled to the processor and store an indicator pulse-duty generated by the processor. The pulse width modulation circuit can be coupled to the indicator pulse-duty register wherein the pulse width modulation circuit modulates a pulse width of the enabled indicator control signal in response to the indicator pulse-duty stored in the indicator pulse-duty register.
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