ATMEGA128A-MU Atmel, ATMEGA128A-MU Datasheet - Page 231

• Manufacturer Part Number: ATMEGA128A-MU
• Description: MCU 8BIT 128K ISP FLASH 64-QFN
• Manufacturer: Atmel
• Series: AVR® ATmegar

Specifications of ATMEGA128A-MU

• Core Processor: AVR
• Core Size: 8-Bit
• Speed: 16MHz
• Connectivity: EBI/EMI, I²C, SPI, UART/USART
• Peripherals: Brown-out Detect/Reset, POR, PWM, WDT
• Number Of I /o: 53
• Program Memory Size: 128KB (64K x 16)
• Program Memory Type: FLASH
• Eeprom Size: 4K x 8
• Ram Size: 4K 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: 64-MLF®, 64-QFN
• Processor Series: ATMEGA128x
• Core: AVR8
• 3rd Party Development Tools: EWAVR, EWAVR-BL
• Development Tools By Supplier: ATAVRDRAGON, ATSTK500, ATSTK600, ATAVRISP2, ATAVRONEKIT
• Controller Family/series: AVR MEGA
• No. Of I/o's: 53
• Eeprom Memory Size: 4KB
• Ram Memory Size: 4KB
• Cpu Speed: 16MHz
• Rohs Compliant: Yes
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

22.3
22.3.1
22.3.2
8151H–AVR–02/11
Register Description
SFIOR - Special Function IO Register
ACSR - Analog Comparator Control and Status Register
If ACME is cleared or ADEN is set, AIN1 is applied to the negative input to the Analog
Comparator.
Table 2. Analog Comparator Multiplexed Input
• 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
TSM
R/W
ADEN
7
0
ACD
R/W
1
0
0
0
0
0
0
0
0
x
7
0
ACBG
R
R/W
6
–
0
“Analog Comparator Multiplexed Input” on page
6
0
MUX2:0
000
001
010
011
100
101
110
111
xxx
xxx
ACO
N/A
R
R
5
–
0
5
Analog Comparator Negative Input
AIN1
AIN1
ADC0
ADC1
ADC2
ADC3
ADC4
ADC5
ADC6
ADC7
R/W
ACI
4
0
R
4
–
0
ACIE
R/W
ACME
3
0
R/W
3
0
ACIC
R/W
PUD
2
0
R/W
2
0
ACIS1
ATmega128A
R/W
PSR0
R/W
1
0
1
0
230.
ACIS0
PSR321
R/W
R/W
0
0
0
0
ACSR
SFIOR
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