ATmega64A Atmel Corporation, ATmega64A Datasheet - Page 231

• Manufacturer Part Number: ATmega64A
• Manufacturer: Atmel Corporation

Specifications of ATmega64A

• Flash (kbytes): 64 Kbytes
• Pin Count: 64
• Max. Operating Frequency: 16 MHz
• Cpu: 8-bit AVR
• # Of Touch Channels: 16
• Hardware Qtouch Acquisition: No
• Max I/o Pins: 53
• Ext Interrupts: 8
• Usb Speed: No
• Usb Interface: No
• Spi: 1
• Twi (i2c): 1
• Uart: 2
• Graphic Lcd: No
• Video Decoder: No
• Camera Interface: No
• Adc Channels: 8
• Adc Resolution (bits): 10
• Adc Speed (ksps): 15
• Analog Comparators: 1
• Resistive Touch Screen: No
• Temp. Sensor: No
• Crypto Engine: No
• Sram (kbytes): 4
• Eeprom (bytes): 2048
• Self Program Memory: YES
• Dram Memory: No
• Nand Interface: No
• Picopower: No
• Temp. Range (deg C): -40 to 85
• I/o Supply Class: 2.7 to 5.5
• Operating Voltage (vcc): 2.7 to 5.5
• Fpu: No
• Mpu / Mmu: no / no
• Timers: 4
• Output Compare Channels: 8
• Input Capture Channels: 2
• Pwm Channels: 7
• 32khz Rtc: Yes
• Calibrated Rc Oscillator: Yes

22.2
22.2.1
22.2.2
8160C–AVR–07/09
Register Description
SFIOR – Special Function IO Register
ACSR – Analog Comparator Control and Status Register
Table 22-1.
• 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 6 – ACBG: Analog Comparator Bandgap Select
When this bit is set, a fixed 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 Compar-
ator.
Bit
0x20
(0x40)
Read/Write
Initial Value
Bit
0x08 (0x28)
Read/Write
Initial Value
ACME
See “Internal Voltage Reference” on page 55.
0
1
1
1
1
1
1
1
1
1
TSM
R/W
Analog Comparator Multiplexed Input
7
0
ACD
R/W
7
0
ADEN
x
1
0
0
0
0
0
0
0
0
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
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
ATmega64A
230.
ACIS0
R/W
PSR10
R/W
0
0
0
0
ACSR
SFIOR
231