mcf51ac256a Freescale Semiconductor, Inc, mcf51ac256a Datasheet - Page 163

• Manufacturer Part Number: mcf51ac256a
• Description: Mcf51ac Flexis
• Manufacturer: Freescale Semiconductor, Inc

8.1.6
The ACMP has the following features:
8.1.7
This section defines the ACMP operation in wait, stop and background debug modes.
8.1.7.1
The ACMP continues to run in wait mode if enabled before executing the WAIT instruction. Therefore,
the ACMP can be used to bring the MCU out of wait mode if the ACMP interrupt, ACIE is enabled. For
lowest possible current consumption, the ACMP should be disabled by software if not required as an
interrupt source during wait mode.
8.1.7.2
8.1.7.2.1
The ACMP continues to operate in Stop3 mode if enabled and compare operation remains active. If
ACOPE is enabled, comparator output operates as 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.
8.1.7.2.2
During either Stop2 and Stop1 mode, the ACMP module will be fully powered down. Upon wake-up from
Stop2 or Stop1 mode, the ACMP module will be in the reset state.
8.1.7.3
When the microcontroller is in active background mode, the ACMP will continue to operate normally.
8.1.8
The block diagram for the Analog Comparator module is shown
Freescale Semiconductor
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Full rail to rail supply operation.
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.
Option to allow comparator output to be visible on a pin, ACMPxO.
Features
Modes of Operation
Block Diagram
ACMP in Wait Mode
ACMP in Stop Modes
ACMP in Active Background Mode
Stop3 Mode Operation
Stop2 and Stop1 Mode Operation
MCF51AC256 ColdFire Integrated Microcontroller Reference Manual, Rev. 5
Figure
8-1.
Analog Comparator (ACMPV3)
8-3