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Analog Comparator (S08ACMPVLPV1)
MCF51QE128 MCU Series Reference Manual, Rev. 3
Freescale Semiconductor 211
10.1.5 Features
The ACMP has the following features:
• Full rail-to-rail supply operation
• Less than 40 mV of input offset
• Less than 15 mV of hysteresis
• Selectable interrupt on rising edge, falling edge, or either rising or falling edges of comparator
output
• Option to compare to fixed internal bandgap reference voltage
10.1.6 Modes of Operation
10.1.6.1 Wait Mode Operation
During wait mode the ACMP, if enabled, continues to operate normally. Also, if enabled, the interrupt can
wake the MCU.
10.1.6.2 Stop3 Mode Operation
If enabled, the ACMP continues to operate in stop3 mode and compare operation remains active. If
ACOPE is enabled, comparator output operates in the normal operating mode and comparator output is
placed onto the external pin. The MCU is brought out of stop when a compare event occurs and ACIE is
enabled; ACF flag sets accordingly.
If stop is exited with a reset, the ACMP will be put into its reset state.
10.1.6.3 Stop2 Mode Operation
During stop2 mode, the ACMP module is fully powered down. Upon wakeup from stop2 mode, the ACMP
module is in the reset state.
10.1.6.4 Active Background Mode Operation
When the microcontroller is in active background mode, the ACMP continues to operate normally.
10.1.7 Block Diagram
The block diagram for the ACMP module follows.