MC9S08DZ96F2CLL datasheet(205/458 Pages) FREESCALE

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Chapter 9 Analog Comparator (S08ACMPV3)

MC9S08DZ128 Series Data Sheet, Rev. 1

Freescale Semiconductor

205

9.4

Functional Description

The analog comparator can be used to compare two analog input voltages applied to ACMPx+ and

ACMPx-; or it can be used to compare an analog input voltage applied to ACMPx- with an internal

bandgap reference voltage. ACBGS is used to select between the bandgap reference voltage or the

ACMPx+ pin as the input to the non-inverting input of the analog comparator. The comparator output is

high when the non-inverting input is greater than the inverting input, and is low when the non-inverting

input is less than the inverting input. ACMOD is used to select the condition which will cause ACF to be

set. ACF can be set on a rising edge of the comparator output, a falling edge of the comparator output, or

either a rising or a falling edge (toggle). The comparator output can be read directly through ACO. The

comparator output can be driven onto the ACMPxO pin using ACOPE.

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