Datasheet

 2018 Microchip Technology Inc. Data Sheet Complete DS40002060A-page 89
ATtiny4/5/9/10
13. Analog Comparator
The Analog Comparator compares the input values on the positive pin AIN0 and negative pin AIN1. When the voltage on
the positive pin AIN0 is higher than the voltage on the negative pin AIN1, the Analog Comparator output, ACO, is set. The
comparator can trigger a separate interrupt, exclusive to the Analog Comparator. The user can select Interrupt triggering
on comparator output rise, fall or toggle. A block diagram of the comparator and its surrounding logic is shown in Figure 13-
1.
Figure 13-1. Analog Comparator Block Diagram.
See Figure 1-1 on page 8 for pin use of analog comparator, and Table 11-4 on page 59 and Table 11-5 on page 60 for
alternate pin usage.
13.1 Register Description
13.1.1 ACSR – Analog Comparator Control and Status Register
• Bit 7 – ACD: Analog Comparator Disable
When this bit is written logic one, the power to the analog comparator is switched off. This bit can be set at any time to turn
off the analog comparator, thus reducing power consumption in Active and Idle mode. When changing the ACD bit, the
analog comparator Interrupt must be disabled by clearing the ACIE bit in ACSR. Otherwise an interrupt can occur when the
bit is changed.
• Bits 6 – Res: Reserved Bit
This bit is reserved and will always read zero.
• Bit 5 – ACO: Analog Comparator Output
Enables output of analog comparator. The output of the analog comparator is synchronized and then directly connected to
ACO. The synchronization introduces a delay of 1 - 2 clock cycles.
Bit 76543210
0x1F ACD
– ACO ACI ACIE ACIC ACIS1 ACIS0 ACSR
Read/Write R/W R R R/W R/W R/W R/W R/W
Initial Value 0 0 0 0 0 0 0 0