SFIOR – Analog Comparator Control and Status Register

When using the I/O specific commands IN and OUT, the I/O addresses 0x00 - 0x3F must be used. When addressing I/O Registers as data space using LD and ST instructions, 0x20 must be added to these offset addresses.

Name:
SFIOR
Offset:
0x30
Reset:
0x02
Access:
When addressing I/O Registers as data space the offset address is 0x50
Bit76543210
ACME
AccessR/W
Reset0

Bit 3 – ACME: Analog Comparator Multiplexer Enable

Analog Comparator Multiplexer Enable

When this bit is written logic one and the ADC is switched off (ADEN in ADCSRA is zero), the ADC multiplexer selects the negative input to the Analog Comparator. When this bit is written logic zero, AIN1 is applied to the negative input of the Analog Comparator. For a detailed description of this bit, see Analog Comparator Multiplexed Input table.