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clock source selectable between an external supply (extal or ckio) and crystal resonatorclock source selectable between an external supply (extal or ckio) and crystal resonator
可在外部电源(extal或ckio)和晶体振荡器之间选择时钟源 可在外部电源(extal或ckio)和晶体振荡器之间选择时钟源