hc82c54数据手册
hc82c54数据手册SEMICONDUCTOR82C54August1996CMOSProgrammableIntervalTimerFeaturesDescription8MHzto12MHzClockInputFrequencyTheHarris82C54isahighperformanceCMOSProgramma-CompatiblewithNMOS8254bleIntervalTimermanufacturedusinganadvanced2micronCMOSprocess.-EnhancedVersionofNMOS8253ThreeIndependent
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