ACMP - Analog Comparator

Description

Analog comparator (ACMP) Peripheral API.

The Analog Comparator is used to compare voltage of two analog inputs with a digital output indicating which input voltage is higher. Inputs can either be one of the selectable internal references or from external pins. Response time and current consumption can be configured by altering the current supply to the comparator.

ACMP is available down to EM3 and is able to wake up the system when input signals pass a certain threshold. Use ACMP_IntEnable() to enable an edge interrupt to use this functionality.

This example shows how to use the em_acmp.h API for comparing an input pin to an internal 2.5 V reference voltage.

/* Initialize with default settings. */
ACMP_Init_TypeDef init = ACMP_INIT_DEFAULT ;
ACMP_Init (ACMP0, &init);
/* In this example we want to compare an analog input to the 2.5 V
* internal reference. The default settings resets the divider for
* acmpInputVREFDIV2V5, which we can use as a 2.5 V reference. */
/* Now we select the two inputs to compare. Here we compare the acmpInputPD2
* input to the internal 2.5V reference. When acmpInputPD2 is lower than
* 2.5 V then the ACMP output is 0 and when acmpInputPD2 is is higher than
* 2.5 V then the ACMP output is 1. */
ACMP_ChannelSet (ACMP0, acmpInputVREFDIV2V5 , acmpInputPD2 );
/* Allocate CDEVEN0 to ACMP0 to be able to use the input. */
GPIO->CDBUSALLOC = GPIO_CDBUSALLOC_CDEVEN0_ACMP0;
/* To be able to probe the output we can send the ACMP output to a pin.
* The second argument to this function is the pin location which is
* device dependent. */
ACMP_GPIOSetup (ACMP0, gpioPortD , 1, true , false );
Note
ACMP can also be used to compare two separate input pins.

ACMP also contains specialized hardware for capacitive sensing. This module contains the ACMP_CapsenseInit() function to initialize ACMP for capacitive sensing and the ACMP_CapsenseChannelSet() function to select the current capsense channel.

For applications that require capacitive sensing it is recommended to use a library, such as cslib, which is provided by Silicon Labs.

Data Structures

struct ACMP_CapsenseInit_TypeDef
Capsense initialization structure.
struct ACMP_Init_TypeDef
ACMP initialization structure.

Functions

void ACMP_CapsenseInit (ACMP_TypeDef *acmp, const ACMP_CapsenseInit_TypeDef *init)
Set up ACMP for use in capacitive sense applications.
void ACMP_CapsenseChannelSet (ACMP_TypeDef *acmp, ACMP_Channel_TypeDef channel)
Set the ACMP channel used for capacitive sensing.
void ACMP_ChannelSet (ACMP_TypeDef *acmp, ACMP_Channel_TypeDef negSel, ACMP_Channel_TypeDef posSel)
Set which channels should be used in ACMP comparisons.
void ACMP_Disable (ACMP_TypeDef *acmp)
Disable ACMP.
void ACMP_Enable (ACMP_TypeDef *acmp)
Enable ACMP.
void ACMP_GPIOSetup (ACMP_TypeDef *acmp, GPIO_Port_TypeDef port, unsigned int pin, bool enable, bool invert)
Sets up GPIO output from the ACMP.
void ACMP_Init (ACMP_TypeDef *acmp, const ACMP_Init_TypeDef *init)
Initialize ACMP.
void ACMP_Reset (ACMP_TypeDef *acmp)
Reset ACMP to the same state that it was in after a hardware reset.
void ACMP_IntClear (ACMP_TypeDef *acmp, uint32_t flags)
Clear one or more pending ACMP interrupts.
void ACMP_IntDisable (ACMP_TypeDef *acmp, uint32_t flags)
Disable one or more ACMP interrupts.
void ACMP_IntEnable (ACMP_TypeDef *acmp, uint32_t flags)
Enable one or more ACMP interrupts.
uint32_t ACMP_IntGet (ACMP_TypeDef *acmp)
Get pending ACMP interrupt flags.
uint32_t ACMP_IntGetEnabled (ACMP_TypeDef *acmp)
Get enabled and pending ACMP interrupt flags.
void ACMP_IntSet (ACMP_TypeDef *acmp, uint32_t flags)
Set one or more pending ACMP interrupts from software.
ACMP_Channel_TypeDef ACMP_PortPinToInput ( GPIO_Port_TypeDef port, uint8_t pin)
Convert GPIO port/pin to ACMP input selection.

Macros

#define ACMP_CAPSENSE_INIT_DEFAULT
A default configuration for capacitive sense mode initialization.
#define ACMP_INIT_DEFAULT
Default configuration for ACMP regular initialization.

Enumerations

enum ACMP_CapsenseResistor_TypeDef {
acmpResistor0 = _ACMP_INPUTCTRL_CSRESSEL_RES0,
acmpResistor1 = _ACMP_INPUTCTRL_CSRESSEL_RES1,
acmpResistor2 = _ACMP_INPUTCTRL_CSRESSEL_RES2,
acmpResistor3 = _ACMP_INPUTCTRL_CSRESSEL_RES3,
acmpResistor4 = _ACMP_INPUTCTRL_CSRESSEL_RES4,
acmpResistor5 = _ACMP_INPUTCTRL_CSRESSEL_RES5,
acmpResistor6 = _ACMP_INPUTCTRL_CSRESSEL_RES6
}
Resistor values used for the internal capacative sense resistor.
enum ACMP_HysteresisLevel_TypeDef {
acmpHysteresisDisabled = _ACMP_CFG_HYST_DISABLED,
acmpHysteresis10Sym = _ACMP_CFG_HYST_SYM10MV,
acmpHysteresis20Sym = _ACMP_CFG_HYST_SYM20MV,
acmpHysteresis30Sym = _ACMP_CFG_HYST_SYM30MV,
acmpHysteresis10Pos = _ACMP_CFG_HYST_POS10MV,
acmpHysteresis20Pos = _ACMP_CFG_HYST_POS20MV,
acmpHysteresis30Pos = _ACMP_CFG_HYST_POS30MV,
acmpHysteresis10Neg = _ACMP_CFG_HYST_NEG10MV,
acmpHysteresis20Neg = _ACMP_CFG_HYST_NEG20MV,
acmpHysteresis30Neg = _ACMP_CFG_HYST_NEG30MV
}
Hysteresis level.
enum ACMP_InputRange_TypeDef {
acmpInputRangeFull = _ACMP_CFG_INPUTRANGE_FULL,
acmpInputRangeReduced = _ACMP_CFG_INPUTRANGE_REDUCED
}
Adjust ACMP performance for a given input voltage range.
enum ACMP_Accuracy_TypeDef {
acmpAccuracyLow = _ACMP_CFG_ACCURACY_LOW,
acmpAccuracyHigh = _ACMP_CFG_ACCURACY_HIGH
}
ACMP accuracy mode.
enum ACMP_Channel_TypeDef {
acmpInputVSS = _ACMP_INPUTCTRL_POSSEL_VSS,
acmpInputVREFDIVAVDD = _ACMP_INPUTCTRL_POSSEL_VREFDIVAVDD,
acmpInputVREFDIVAVDDLP = _ACMP_INPUTCTRL_POSSEL_VREFDIVAVDDLP,
acmpInputVREFDIV1V25 = _ACMP_INPUTCTRL_POSSEL_VREFDIV1V25,
acmpInputVREFDIV1V25LP = _ACMP_INPUTCTRL_POSSEL_VREFDIV1V25LP,
acmpInputVREFDIV2V5 = _ACMP_INPUTCTRL_POSSEL_VREFDIV2V5,
acmpInputVREFDIV2V5LP = _ACMP_INPUTCTRL_POSSEL_VREFDIV2V5LP,
acmpInputVSENSE01DIV4 = _ACMP_INPUTCTRL_POSSEL_VSENSE01DIV4,
acmpInputVSENSE01DIV4LP = _ACMP_INPUTCTRL_POSSEL_VSENSE01DIV4LP,
acmpInputVSENSE11DIV4 = _ACMP_INPUTCTRL_POSSEL_VSENSE11DIV4,
acmpInputVSENSE11DIV4LP = _ACMP_INPUTCTRL_POSSEL_VSENSE11DIV4LP,
acmpInputCAPSENSE = _ACMP_INPUTCTRL_NEGSEL_CAPSENSE,
acmpInputVDACOUT0 = _ACMP_INPUTCTRL_POSSEL_VDACOUT0,
acmpInputVDACOUT1 = _ACMP_INPUTCTRL_POSSEL_VDACOUT1,
acmpInputPA0 = _ACMP_INPUTCTRL_POSSEL_PA0,
acmpInputPA1 = _ACMP_INPUTCTRL_POSSEL_PA1,
acmpInputPA2 = _ACMP_INPUTCTRL_POSSEL_PA2,
acmpInputPA3 = _ACMP_INPUTCTRL_POSSEL_PA3,
acmpInputPA4 = _ACMP_INPUTCTRL_POSSEL_PA4,
acmpInputPA5 = _ACMP_INPUTCTRL_POSSEL_PA5,
acmpInputPA6 = _ACMP_INPUTCTRL_POSSEL_PA6,
acmpInputPA7 = _ACMP_INPUTCTRL_POSSEL_PA7,
acmpInputPA8 = _ACMP_INPUTCTRL_POSSEL_PA8,
acmpInputPA9 = _ACMP_INPUTCTRL_POSSEL_PA9,
acmpInputPA10 = _ACMP_INPUTCTRL_POSSEL_PA10,
acmpInputPA11 = _ACMP_INPUTCTRL_POSSEL_PA11,
acmpInputPA12 = _ACMP_INPUTCTRL_POSSEL_PA12,
acmpInputPA13 = _ACMP_INPUTCTRL_POSSEL_PA13,
acmpInputPA14 = _ACMP_INPUTCTRL_POSSEL_PA14,
acmpInputPA15 = _ACMP_INPUTCTRL_POSSEL_PA15,
acmpInputPB0 = _ACMP_INPUTCTRL_POSSEL_PB0,
acmpInputPB1 = _ACMP_INPUTCTRL_POSSEL_PB1,
acmpInputPB2 = _ACMP_INPUTCTRL_POSSEL_PB2,
acmpInputPB3 = _ACMP_INPUTCTRL_POSSEL_PB3,
acmpInputPB4 = _ACMP_INPUTCTRL_POSSEL_PB4,
acmpInputPB5 = _ACMP_INPUTCTRL_POSSEL_PB5,
acmpInputPB6 = _ACMP_INPUTCTRL_POSSEL_PB6,
acmpInputPB7 = _ACMP_INPUTCTRL_POSSEL_PB7,
acmpInputPB8 = _ACMP_INPUTCTRL_POSSEL_PB8,
acmpInputPB9 = _ACMP_INPUTCTRL_POSSEL_PB9,
acmpInputPB10 = _ACMP_INPUTCTRL_POSSEL_PB10,
acmpInputPB11 = _ACMP_INPUTCTRL_POSSEL_PB11,
acmpInputPB12 = _ACMP_INPUTCTRL_POSSEL_PB12,
acmpInputPB13 = _ACMP_INPUTCTRL_POSSEL_PB13,
acmpInputPB14 = _ACMP_INPUTCTRL_POSSEL_PB14,
acmpInputPB15 = _ACMP_INPUTCTRL_POSSEL_PB15,
acmpInputPC0 = _ACMP_INPUTCTRL_POSSEL_PC0,
acmpInputPC1 = _ACMP_INPUTCTRL_POSSEL_PC1,
acmpInputPC2 = _ACMP_INPUTCTRL_POSSEL_PC2,
acmpInputPC3 = _ACMP_INPUTCTRL_POSSEL_PC3,
acmpInputPC4 = _ACMP_INPUTCTRL_POSSEL_PC4,
acmpInputPC5 = _ACMP_INPUTCTRL_POSSEL_PC5,
acmpInputPC6 = _ACMP_INPUTCTRL_POSSEL_PC6,
acmpInputPC7 = _ACMP_INPUTCTRL_POSSEL_PC7,
acmpInputPC8 = _ACMP_INPUTCTRL_POSSEL_PC8,
acmpInputPC9 = _ACMP_INPUTCTRL_POSSEL_PC9,
acmpInputPC10 = _ACMP_INPUTCTRL_POSSEL_PC10,
acmpInputPC11 = _ACMP_INPUTCTRL_POSSEL_PC11,
acmpInputPC12 = _ACMP_INPUTCTRL_POSSEL_PC12,
acmpInputPC13 = _ACMP_INPUTCTRL_POSSEL_PC13,
acmpInputPC14 = _ACMP_INPUTCTRL_POSSEL_PC14,
acmpInputPC15 = _ACMP_INPUTCTRL_POSSEL_PC15,
acmpInputPD0 = _ACMP_INPUTCTRL_POSSEL_PD0,
acmpInputPD1 = _ACMP_INPUTCTRL_POSSEL_PD1,
acmpInputPD2 = _ACMP_INPUTCTRL_POSSEL_PD2,
acmpInputPD3 = _ACMP_INPUTCTRL_POSSEL_PD3,
acmpInputPD4 = _ACMP_INPUTCTRL_POSSEL_PD4,
acmpInputPD5 = _ACMP_INPUTCTRL_POSSEL_PD5,
acmpInputPD6 = _ACMP_INPUTCTRL_POSSEL_PD6,
acmpInputPD7 = _ACMP_INPUTCTRL_POSSEL_PD7,
acmpInputPD8 = _ACMP_INPUTCTRL_POSSEL_PD8,
acmpInputPD9 = _ACMP_INPUTCTRL_POSSEL_PD9,
acmpInputPD10 = _ACMP_INPUTCTRL_POSSEL_PD10,
acmpInputPD11 = _ACMP_INPUTCTRL_POSSEL_PD11,
acmpInputPD12 = _ACMP_INPUTCTRL_POSSEL_PD12,
acmpInputPD13 = _ACMP_INPUTCTRL_POSSEL_PD13,
acmpInputPD14 = _ACMP_INPUTCTRL_POSSEL_PD14,
acmpInputPD15 = _ACMP_INPUTCTRL_POSSEL_PD15
}
ACMP Input Selection.

Function Documentation

◆ ACMP_CapsenseInit()

void ACMP_CapsenseInit ( ACMP_TypeDef * acmp,
const ACMP_CapsenseInit_TypeDef * init
)

Set up ACMP for use in capacitive sense applications.

This function sets up ACMP for use in capacitive sense applications. To use the capacitive sense functionality in the ACMP, use the PRS output of the ACMP module to count the number of oscillations in the capacitive sense circuit (possibly using a TIMER).

Note
A basic example of capacitive sensing can be found in the STK BSP (capsense demo).
A call to ACMP_CapsenseInit will enable and disable the ACMP peripheral, which can cause side effects if it was previously set up.
Parameters
[in] acmp A pointer to the ACMP peripheral register block.
[in] init A pointer to the initialization structure used to configure ACMP for capacitive sensing operation.

◆ ACMP_CapsenseChannelSet()

void ACMP_CapsenseChannelSet ( ACMP_TypeDef * acmp,
ACMP_Channel_TypeDef channel
)

Set the ACMP channel used for capacitive sensing.

Note
A basic example of capacitive sensing can be found in the STK BSP (capsense demo).
Can only be called when the peripheral is enabled.
Parameters
[in] acmp A pointer to the ACMP peripheral register block.
[in] channel The ACMP channel to use for capacitive sensing (Possel).

◆ ACMP_ChannelSet()

void ACMP_ChannelSet ( ACMP_TypeDef * acmp,
ACMP_Channel_TypeDef negSel,
ACMP_Channel_TypeDef posSel
)

Set which channels should be used in ACMP comparisons.

Note
Can only be called when the peripheral is enabled.
If GPIO is used for both posSel and negSel, they cannot both use even or odd pins.
Parameters
[in] acmp A pointer to the ACMP peripheral register block.
negSel A channel to use on the negative input to the ACMP.
posSel A channel to use on the positive input to the ACMP.

◆ ACMP_Disable()

void ACMP_Disable ( ACMP_TypeDef * acmp )

Disable ACMP.

Parameters
[in] acmp A pointer to the ACMP peripheral register block.

◆ ACMP_Enable()

void ACMP_Enable ( ACMP_TypeDef * acmp )

Enable ACMP.

Parameters
[in] acmp A pointer to the ACMP peripheral register block.

◆ ACMP_GPIOSetup()

void ACMP_GPIOSetup ( ACMP_TypeDef * acmp,
GPIO_Port_TypeDef port,
unsigned int pin,
bool enable,
bool invert
)

Sets up GPIO output from the ACMP.

Note
GPIO must be enabled in the CMU before this function call, i.e. 
CMU_ClockEnable(cmuClock_GPIO, true);
Parameters
[in] acmp Pointer to the ACMP peripheral register block.
port The GPIO port to use.
pin The GPIO pin to use.
enable Enable or disable pin output.
invert Invert output.

◆ ACMP_Init()

void ACMP_Init ( ACMP_TypeDef * acmp,
const ACMP_Init_TypeDef * init
)

Initialize ACMP.

Note
A call to ACMP_Init can cause side effects since it can enable/disable the peripheral.
Parameters
[in] acmp A pointer to the ACMP peripheral register block.
[in] init A pointer to the initialization structure used to configure ACMP.

◆ ACMP_Reset()

void ACMP_Reset ( ACMP_TypeDef * acmp )

Reset ACMP to the same state that it was in after a hardware reset.

Note
The GPIO ACMP ROUTE register is NOT reset by this function to allow for centralized setup of this feature.
The peripheral may be enabled and disabled during reset.
Parameters
[in] acmp A pointer to the ACMP peripheral register block.

◆ ACMP_IntClear()

void ACMP_IntClear ( ACMP_TypeDef * acmp,
uint32_t flags
)
inline

Clear one or more pending ACMP interrupts.

Parameters
[in] acmp A pointer to the ACMP peripheral register block.
[in] flags Pending ACMP interrupt source to clear. Use a bitwise logic OR combination of valid interrupt flags for the ACMP module. The flags can be, for instance, ACMP_IFC_EDGE or ACMP_IFC_WARMUP.

◆ ACMP_IntDisable()

void ACMP_IntDisable ( ACMP_TypeDef * acmp,
uint32_t flags
)
inline

Disable one or more ACMP interrupts.

Parameters
[in] acmp A pointer to the ACMP peripheral register block.
[in] flags ACMP interrupt sources to disable. Use a bitwise logic OR combination of valid interrupt flags for the ACMP module. The flags can be, for instance, ACMP_IEN_EDGE or ACMP_IEN_WARMUP.

◆ ACMP_IntEnable()

void ACMP_IntEnable ( ACMP_TypeDef * acmp,
uint32_t flags
)
inline

Enable one or more ACMP interrupts.

Note
Depending on the use, a pending interrupt may already be set prior to enabling the interrupt. Consider using ACMP_IntClear() prior to enabling if a pending interrupt should be ignored.
Parameters
[in] acmp A pointer to the ACMP peripheral register block.
[in] flags ACMP interrupt sources to enable. Use a bitwise logic OR combination of valid interrupt flags for the ACMP module. The flags can be, for instance, ACMP_IEN_EDGE or ACMP_IEN_WARMUP.

◆ ACMP_IntGet()

uint32_t ACMP_IntGet ( ACMP_TypeDef * acmp )
inline

Get pending ACMP interrupt flags.

Note
This function does not clear event bits.
Parameters
[in] acmp A pointer to the ACMP peripheral register block.
Returns
Pending ACMP interrupt sources. A bitwise logic OR combination of valid interrupt flags for the ACMP module. The pending interrupt sources can be, for instance, ACMP_IF_EDGE or ACMP_IF_WARMUP.

◆ ACMP_IntGetEnabled()

uint32_t ACMP_IntGetEnabled ( ACMP_TypeDef * acmp )
inline

Get enabled and pending ACMP interrupt flags.

Useful for handling more interrupt sources in the same interrupt handler.

Parameters
[in] acmp A pointer to the ACMP peripheral register block.
Note
This function does not clear interrupt flags.
Returns
Pending and enabled ACMP interrupt sources. The return value is the bitwise AND combination of
  • the OR combination of enabled interrupt sources in ACMPx_IEN_nnn register (ACMPx_IEN_nnn) and
  • the OR combination of valid interrupt flags of the ACMP module (ACMPx_IF_nnn).

◆ ACMP_IntSet()

void ACMP_IntSet ( ACMP_TypeDef * acmp,
uint32_t flags
)
inline

Set one or more pending ACMP interrupts from software.

Parameters
[in] acmp A pointer to the ACMP peripheral register block.
[in] flags ACMP interrupt sources to set as pending. Use a bitwise logic OR combination of valid interrupt flags for the ACMP module. The flags can be, for instance, ACMP_IFS_EDGE or ACMP_IFS_WARMUP.

◆ ACMP_PortPinToInput()

ACMP_Channel_TypeDef ACMP_PortPinToInput ( GPIO_Port_TypeDef port,
uint8_t pin
)
inline

Convert GPIO port/pin to ACMP input selection.

Parameters
[in] port GPIO port
[in] pin GPIO pin
Returns
ACMP input selection

Macro Definition Documentation

◆ ACMP_CAPSENSE_INIT_DEFAULT

#define ACMP_CAPSENSE_INIT_DEFAULT
Value:
{ \
_ACMP_CFG_BIAS_DEFAULT, /* Using biasProg default value. */ \
acmpHysteresisDisabled, /* Disable hysteresis. */ \
acmpResistor5, /* Use internal resistor value 5. */ \
0x3F, /* Set VREFDIV to maximum to disable divide. */ \
true /* Enable after init. */ \
}

A default configuration for capacitive sense mode initialization.

◆ ACMP_INIT_DEFAULT

#define ACMP_INIT_DEFAULT
Value:
{ \
_ACMP_CFG_BIAS_DEFAULT, /* Using biasProg default value. */ \
acmpInputRangeFull, /* Input range from 0 to Vdd. */ \
acmpAccuracyLow, /* Low accuracy, less current usage. */ \
acmpHysteresisDisabled, /* Disable hysteresis. */ \
false, /* Output 0 when ACMP is inactive. */ \
0x3F, /* Set VREFDIV to maximum to disable divide. */ \
true /* Enable after init. */ \
}

Default configuration for ACMP regular initialization.

Enumeration Type Documentation

◆ ACMP_CapsenseResistor_TypeDef

enum ACMP_CapsenseResistor_TypeDef

Resistor values used for the internal capacative sense resistor.

See data sheet for your device for details on each resistor value.

Enumerator
acmpResistor0

Resistor value 0.

acmpResistor1

Resistor value 1.

acmpResistor2

Resistor value 2.

acmpResistor3

Resistor value 3.

acmpResistor4

Resistor value 4.

acmpResistor5

Resistor value 5.

acmpResistor6

Resistor value 6.

◆ ACMP_HysteresisLevel_TypeDef

enum ACMP_HysteresisLevel_TypeDef

Hysteresis level.

See data sheet for your device for details on each level.

Enumerator
acmpHysteresisDisabled

Mode DISABLED for ACMP_CFG.

acmpHysteresis10Sym

Mode HYST10SYM for ACMP_CFG.

acmpHysteresis20Sym

Mode HYST20SYM for ACMP_CFG.

acmpHysteresis30Sym

Mode HYST30SYM for ACMP_CFG.

acmpHysteresis10Pos

Mode HYST10POS for ACMP_CFG.

acmpHysteresis20Pos

Mode HYST20POS for ACMP_CFG.

acmpHysteresis30Pos

Mode HYST30POS for ACMP_CFG.

acmpHysteresis10Neg

Mode HYST10NEG for ACMP_CFG.

acmpHysteresis20Neg

Mode HYST20NEG for ACMP_CFG.

acmpHysteresis30Neg

Mode HYST30NEG for ACMP_CFG.

◆ ACMP_InputRange_TypeDef

enum ACMP_InputRange_TypeDef

Adjust ACMP performance for a given input voltage range.

Enumerator
acmpInputRangeFull

Input can be from 0 to VDD.

acmpInputRangeReduced

Input can be from 0 to VDD-0.7 V.

◆ ACMP_Accuracy_TypeDef

enum ACMP_Accuracy_TypeDef

ACMP accuracy mode.

Enumerator
acmpAccuracyLow

Low-accuracy mode which consumes less current.

acmpAccuracyHigh

High-accuracy mode which consumes more current.

◆ ACMP_Channel_TypeDef

enum ACMP_Channel_TypeDef

ACMP Input Selection.

Enumerator
acmpInputVSS

Select VSS.

acmpInputVREFDIVAVDD

Select Divided AVDD.

acmpInputVREFDIVAVDDLP

Select Low-Power Divided AVDD.

acmpInputVREFDIV1V25

Select Divided 1V25 reference.

acmpInputVREFDIV1V25LP

Select Low-power Divided 1V25 reference.

acmpInputVREFDIV2V5

Select Divided 2V5 reference.

acmpInputVREFDIV2V5LP

Select Low-power Divided 2V5 reference.

acmpInputVSENSE01DIV4

Select VSENSE0 divided by 4.

acmpInputVSENSE01DIV4LP

Select Low-power VSENSE0 divided by 4.

acmpInputVSENSE11DIV4

VSENSE1 divided by 4.

acmpInputVSENSE11DIV4LP

Low-power VSENSE1 divided by 4.

acmpInputCAPSENSE

Select Low-Power Divided AVDD.

acmpInputVDACOUT0

Select VDAC0 channel 0 output.

acmpInputVDACOUT1

Select VDAC0 channel 1 output.

acmpInputPA0

Select Port A Pin0.

acmpInputPA1

Select Port A Pin1.

acmpInputPA2

Select Port A Pin2.

acmpInputPA3

Select Port A Pin3.

acmpInputPA4

Select Port A Pin4.

acmpInputPA5

Select Port A Pin5.

acmpInputPA6

Select Port A Pin6.

acmpInputPA7

Select Port A Pin7.

acmpInputPA8

Select Port A Pin8.

acmpInputPA9

Select Port A Pin9.

acmpInputPA10

Select Port A Pin10.

acmpInputPA11

Select Port A Pin11.

acmpInputPA12

Select Port A Pin12.

acmpInputPA13

Select Port A Pin13.

acmpInputPA14

Select Port A Pin14.

acmpInputPA15

Select Port A Pin15.

acmpInputPB0

Select Port B Pin0.

acmpInputPB1

Select Port B Pin1.

acmpInputPB2

Select Port B Pin2.

acmpInputPB3

Select Port B Pin3.

acmpInputPB4

Select Port B Pin4.

acmpInputPB5

Select Port B Pin5.

acmpInputPB6

Select Port B Pin6.

acmpInputPB7

Select Port B Pin7.

acmpInputPB8

Select Port B Pin8.

acmpInputPB9

Select Port B Pin9.

acmpInputPB10

Select Port B Pin10.

acmpInputPB11

Select Port B Pin11.

acmpInputPB12

Select Port B Pin12.

acmpInputPB13

Select Port B Pin13.

acmpInputPB14

Select Port B Pin14.

acmpInputPB15

Select Port B Pin15.

acmpInputPC0

Select Port C Pin0.

acmpInputPC1

Select Port C Pin1.

acmpInputPC2

Select Port C Pin2.

acmpInputPC3

Select Port C Pin3.

acmpInputPC4

Select Port C Pin4.

acmpInputPC5

Select Port C Pin5.

acmpInputPC6

Select Port C Pin6.

acmpInputPC7

Select Port C Pin7.

acmpInputPC8

Select Port C Pin8.

acmpInputPC9

Select Port C Pin9.

acmpInputPC10

Select Port C Pin10.

acmpInputPC11

Select Port C Pin11.

acmpInputPC12

Select Port C Pin12.

acmpInputPC13

Select Port C Pin13.

acmpInputPC14

Select Port C Pin14.

acmpInputPC15

Select Port C Pin15.

acmpInputPD0

Select Port D Pin0.

acmpInputPD1

Select Port D Pin1.

acmpInputPD2

Select Port D Pin2.

acmpInputPD3

Select Port D Pin3.

acmpInputPD4

Select Port D Pin4.

acmpInputPD5

Select Port D Pin5.

acmpInputPD6

Select Port D Pin6.

acmpInputPD7

Select Port D Pin7.

acmpInputPD8

Select Port D Pin8.

acmpInputPD9

Select Port D Pin9.

acmpInputPD10

Select Port D Pin10.

acmpInputPD11

Select Port D Pin11.

acmpInputPD12

Select Port D Pin12.

acmpInputPD13

Select Port D Pin13.

acmpInputPD14

Select Port D Pin14.

acmpInputPD15

Select Port D Pin15.