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Altera公司的MAXII CPLD系列采用内部振荡器,它的功耗低于外接振荡器。内部振荡器的精度只有±25%,因此有时限制了它的使用。很多应用会要求更高的精度,如用于数据采集和实时时钟的间隔计时
Altera’s MAXII CPLD family uses an internal oscillator that consumes less power than an external oscillator. The accuracy of the internal oscillator is only ± 25%, so its use is sometimes limited. Many applications require higher accuracy, such as interval timekeeping for data acquisition and real-time clocking