attiny24v ATMEL Corporation, attiny24v Datasheet - Page 130
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attiny24v
Manufacturer Part Number
attiny24v
Description
8-bit Avr Microcontroller With 2/4/8k Bytes Insystem Programmable Flash
Manufacturer
ATMEL Corporation
Datasheet
1.ATTINY24V.pdf
(236 pages)
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15.2
15.2.1
130
Register Description
ATtiny24/44/84
ACSR – Analog Comparator Control and Status Register
Table 15-1.
• 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. This will reduce 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.
• Bit 6 – ACBG: Analog Comparator Bandgap Select
When this bit is set, a fixed, internal 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.
• Bit 5 – ACO: Analog Comparator Output
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 4 – ACI: Analog Comparator Interrupt Flag
This bit is set by hardware when a comparator output event triggers the interrupt mode defined
by ACIS1 and ACIS0. The Analog Comparator interrupt routine is executed if the ACIE bit is set
and the I-bit in SREG is set. ACI is cleared by hardware when executing the corresponding inter-
rupt handling vector. Alternatively, ACI is cleared by writing a logic one to the flag.
• Bit 3 – ACIE: Analog Comparator Interrupt Enable
When the ACIE bit is written logic one and the I-bit in the Status Register is set, the Analog Com-
parator interrupt is activated. When written logic zero, the interrupt is disabled.
• Bit 2 – ACIC: Analog Comparator Input Capture Enable
When written logic one, this bit enables the input capture function in Timer/Counter1 to be trig-
gered by the Analog Comparator. The comparator output is in this case directly connected to the
input capture front-end logic, making the comparator utilize the noise canceler and edge select
features of the Timer/Counter1 Input Capture interrupt. When written logic zero, no connection
Bit
0x08 (0x28)
Read/Write
Initial Value
ACME
1
1
1
1
Analog Comparator Multiplexed Input (Continued)
ACD
R/W
ADEN
7
0
0
0
0
0
ACBG
R/W
6
0
MUX4..0
00100
00101
00110
00111
ACO
N/A
5
R
Analog Comparator Negative Input
ADC4
ADC5
ADC6
ADC7
R/W
ACI
4
0
ACIE
R/W
3
0
ACIC
R/W
2
0
ACIS1
R/W
1
0
ACIS0
R/W
0
0
8006H–AVR–10/09
ACSR
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