Comparator, Power-Down Detection, Internal Reference Voltage; Comparator Output Pin Switching; Internal Structure Of Comparator - STC micro STC8A8K64D4 Series Reference Manual

STC8A8K64D4 Series Manual

15 Comparator, Power-down Detection, Internal

Reference Voltage

A comparator is integrated in STC8A8K64D4 series of microcontrollers. The positive terminal of the comparator

can be P3.7, P5.0, P5.1 or ADC analog input, and the negative can be P3.6 or the REFV voltage of the internal BandGap

after amplified.

The application of multiple comparators can be realized through multiplexer and time division

multiplexing.

There are two stage programmable filterings inside the comparator: analog filtering and digital filtering. Analog

filtering can filter out glitches in the input signal, and digital filtering can wait for the input signal to stabilize before

making a comparison. The result of the comparison can be obtained directly by reading the internal register bits or

output the result of the comparator forward or reverse to the external port. Outputting the comparison result to the

external port can be used as the trigger signal of external events and the feedback signal to expand the scope of

application.

CMPO_S: Comparator output pin select bit

Internal REFV(1.19V)

ADCIN include ADC0, ADC1, ADC2, ADC3, ADC4, ADC5, ADC6, ADC7,

ADC8, ADC9, ADC10, ADC11, ADC12, ADC13, ADC14, ADC15

Note: When the ADC input channel i s s e l e c t e d a s the positive pole of the

comparator, be sure to turn on the ADC power control bit ADC_POWER and the

ADC channel selection bit ADC_CHS in the ADC_CONTR register.

analog filtering

digital filtering

The internal structure of

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