Bit
Name
Reset
Access Description
2
LTVDDDIV2
Setting when the input will always be less than ACMPVDD/2.
17:16
Reserved
To ensure compatibility with future devices, always write bits to 0. More information in
15
ACCURACY
0
RW
ACMP Accuracy Mode
Select between low and high accuracy mode of the comparator. Note, high frequency changes can cause the ACMP per-
formance to degrade. For such uses, such as quickly scanning through multiple channels or setting the ACMP to oscillate
for capacitive sense, this bit should be set to 1.
Value
Mode
Description
0
LOW
ACMP operates in low-accuracy mode but consumes less current.
1
HIGH
ACMP operates in high-accuracy mode but consumes more current.
14:12
PWRSEL
0x0
RW
Power Select
Selects the power source for the ACMP(ACMPVDD). NOTE, this field should only be changed when the block is disabled
(EN=0).
Value
Mode
Description
0
AVDD
AVDD supply
1
DVDD
DVDD supply
2
IOVDD0
IOVDD/IOVDD0 supply
4
IOVDD1
IOVDD1 supply (if part has two I/O voltages)
11
Reserved
To ensure compatibility with future devices, always write bits to 0. More information in
10
APORTVMASTER-
DIS
0
RW
APORT Bus Master Disable for Bus Selected By VASEL
Determines if the ACMP will request the X or Y APORT bus selected by VASEL. This bit allows multiple APORT connected
devices to monitor the same APORT bus simultaneously by allowing the ACMP to not master the selected bus. When 1,
the determination is expected to be from another peripheral, and the ACMP only passively looks at the bus. When 1, the
selection of channel for a selected bus is ignored (the bus is not), and is whatever selection the external device mastering
the bus has configured for the APORT bus.
Value
Description
0
Bus mastering enabled
1
Bus mastering disabled
9
APORTYMASTER-
DIS
0
RW
APORT Bus Y Master Disable
Determines if the ACMP will request the APORT Y bus selected by POSSEL or NEGSEL. This bit allows multiple APORT
connected devices to monitor the same APORT bus simultaneously by allowing the ACMP to not master the selected bus.
When 1, the determination is expected to be from another peripheral, and the ACMP only passively looks at the bus. When
1, the selection of channel for a selected bus is ignored (the bus is not), and is whatever selection the external device mas-
tering the bus has configured for the APORT bus.
Value
Description
0
Bus mastering enabled
1
Bus mastering disabled
Reference Manual
ACMP - Analog Comparator
silabs.com
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