MC9S08EL32 Datasheet, PDF (135/356 Pages) Freescale Semiconductor, Inc – 8-Bit HCS08 Central Processor Unit (CPU)

Analog Comparator (S08ACMPV2)
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.
MC9S08EL32 Series and MC9S08SL16 Series Data Sheet, Rev. 3
Freescale Semiconductor
135