AT90USB1286-16MU ATMEL [ATMEL Corporation], AT90USB1286-16MU Datasheet - Page 313

• Manufacturer Part Number: AT90USB1286-16MU
• Description: Microcontroller with 64/128K Bytes of ISP Flash and USB Controller
• Manufacturer: ATMEL [ATMEL Corporation]

24. Analog Comparator
24.0.1
24.0.2
7593A–AVR–02/06
ADC Control and Status Register B – ADCSRB
Analog Comparator Control and Status Register – ACSR
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’s output can be set to trigger
the Timer/Counter1 Input Capture function. In addition, the comparator can trigger a separate
interrupt, exclusive to the Analog Comparator. The user can select Interrupt triggering on com-
parator output rise, fall or toggle. A block diagram of the comparator and its surrounding logic is
shown in
The Power Reduction ADC bit, PRADC, in
must be disabled by writing a logical zero to be able to use the ADC input MUX.
Figure 24-1. Analog Comparator Block Diagram
Notes:
• Bit 6 – ACME: 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
• Bit 7 – ACD: Analog Comparator Disable
Bit
Read/Write
Initial Value
Bit
Read/Write
Initial Value
ADC MULTIPLEXER
1. See
2. Refer to
Figure
REFERENCE
ACME
ADEN
OUTPUT
BANDGAP
placement.
7
–
R
0
7
ACD
R/W
0
Table 24-2 on page
(1)
24-1.
ACBG
Figure 1-1 on page 3
6
ACBG
R/W
0
6
ACME
R/W
0
“Analog Comparator Multiplexed Input” on page
5
ACO
R
N/A
5
–
R
0
315.
4
ACI
R/W
0
4
–
R
0
and
Table 10-6 on page 81
“Power Reduction Register 0 - PRR0” on page 55
3
ACIE
R/W
0
3
-
R
0
(2)
2
ACIC
R/W
0
2
ADTS2
R/W
0
1
ACIS1
R/W
0
1
ADTS1
R/W
0
for Analog Comparator pin
AT90USB64/128
0
ACIS0
R/W
0
0
ADTS0
R/W
0
315.
ACSR
ADCSRB
313