ATMEGA8A-MUR Atmel, ATMEGA8A-MUR Datasheet - Page 196
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ATMEGA8A-MUR
Manufacturer Part Number
ATMEGA8A-MUR
Description
MCU AVR 8KB FLASH 16MHZ 32QFN
Manufacturer
Atmel
Series
AVR® ATmegar
Datasheet
1.ATMEGA8A-MU.pdf
(308 pages)
Specifications of ATMEGA8A-MUR
Core Processor
AVR
Core Size
8-Bit
Speed
16MHz
Connectivity
I²C, SPI, UART/USART
Peripherals
Brown-out Detect/Reset, POR, PWM, WDT
Number Of I /o
23
Program Memory Size
8KB (4K x 16)
Program Memory Type
FLASH
Eeprom Size
512 x 8
Ram Size
1K x 8
Voltage - Supply (vcc/vdd)
2.7 V ~ 5.5 V
Data Converters
A/D 8x10b
Oscillator Type
Internal
Operating Temperature
-40°C ~ 85°C
Package / Case
*
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
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21.3
21.3.1
21.3.2
8159D–AVR–02/11
Register Description
SFIOR – Special Function IO Register
ACSR – Analog Comparator Control and Status Register
21-1. If ACME is cleared or ADEN is set, AIN1 is applied to the negative input to the Analog
Comparator.
Table 21-1.
Note:
• Bit 3 – 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
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
Read/Write
Initial Value
Bit
Read/Write
Initial Value
ACME
0
1
1
1
1
1
1
1
1
1
1. ADC7:6 are only available in TQFP and QFN/MLF Package.
Analog Comparator Multiplexed Input
R
7
–
0
ACD
R/W
7
0
ADEN
1
0
0
0
0
0
0
0
0
x
ACBG
R/W
R
6
–
0
6
0
“Analog Comparator Multiplexed Input” on page
MUX2:0
000
001
010
011
100
101
110
111
xxx
xxx
ACO
N/A
R
5
R
5
–
0
R/W
ACI
Analog Comparator Negative Input
AIN1
AIN1
ADC0
ADC1
ADC2
ADC3
ADC4
ADC5
ADC6
ADC7
4
0
R
4
–
0
ACIE
R/W
(1)
ACME
3
0
R/W
3
0
ACIC
R/W
2
0
PUD
R/W
2
0
ACIS1
R/W
PSR2
1
0
R/W
1
0
195.
ATmega8A
ACIS0
R/W
PSR10
R/W
0
0
0
0
ACSR
SFIOR
196
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