18.4.2 Analog Comparator Control and Status Register 0

Name: ACSRB
Offset: 0x1E
Reset: 0x00

Bit 76543210 
       ACOEACPMUX 
Access R/WR/W 
Reset 00 

Bit 1 – ACOE Analog Comparator Output Enable

When this bit is set, the analog comparator output is connected to the ACO pin.

Bit 0 – ACPMUX Analog Comparator Positive Input Multiplexer

When this bit is set, a fixed bandgap reference voltage replaces the positive input to the Analog Comparator. When this bit is cleared, AIN0 is applied to the positive input of the Analog Comparator. When the bandgap reference is used as input to the Analog Comparator, it will take a certain time for the voltage to stabilize. If not stabilized, the first conversion may give a wrong value.