MC9S08DZ60CLH Datasheet, PDF (167/416 Pages) Freescale Semiconductor, Inc – MC9S08DZ60 Series Features

Chapter 9
Analog Comparator (S08ACMPV3)
9.1 Introduction
The analog comparator module (ACMP) provides a circuit for comparing two analog input voltages or for
comparing one analog input voltage to an internal reference voltage. The comparator circuit is designed to
operate across the full range of the supply voltage (rail-to-rail operation).
All MC9S08DZ60 Series MCUs have two full function ACMPs in a 64-pin package. MCUs in the 48-pin
package have two ACMPs, but the output of ACMP2 is not accessible. MCUs in the 32-pin package
contain one full function ACMP.
NOTE
MC9S08DZ60 Series devices operate at a higher voltage range (2.7 V to
5.5 V) and do not include stop1 mode. Please ignore references to stop1.
9.1.1 ACMP Configuration Information
When using the bandgap reference voltage for input to ACMP+, the user must enable the bandgap buffer
by setting BGBE =1 in SPMSC1 see Section 5.8.7, “System Power Management Status and Control 1
Register (SPMSC1).” For value of bandgap voltage reference see Section A.6, “DC Characteristics.”
MC9S08DZ60 Series Data Sheet, Rev. 4
Freescale Semiconductor
167