ATmega32U4 Atmel Corporation, ATmega32U4 Datasheet - Page 291
ATmega32U4
Manufacturer Part Number
ATmega32U4
Description
Manufacturer
Atmel Corporation
Specifications of ATmega32U4
Flash (kbytes)
32 Kbytes
Pin Count
44
Max. Operating Frequency
16 MHz
Cpu
8-bit AVR
# Of Touch Channels
14
Hardware Qtouch Acquisition
No
Max I/o Pins
26
Ext Interrupts
13
Usb Transceiver
1
Usb Speed
Full Speed
Usb Interface
Device
Spi
2
Twi (i2c)
1
Uart
1
Graphic Lcd
No
Video Decoder
No
Camera Interface
No
Adc Channels
12
Adc Resolution (bits)
10
Adc Speed (ksps)
15
Analog Comparators
1
Resistive Touch Screen
No
Temp. Sensor
Yes
Crypto Engine
No
Sram (kbytes)
3.3
Eeprom (bytes)
1024
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
12
Input Capture Channels
2
Pwm Channels
8
32khz Rtc
No
Calibrated Rc Oscillator
Yes
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23.1
23.1.1
7766F–AVR–11/10
Analog Comparator Multiplexed Input
Digital Input Disable Register 1 – DIDR1
It is possible to select any of the ADC13..0 pins to replace the negative input to the Analog Com-
parator. The ADC multiplexer is used to select this input, and consequently, the ADC must be
switched off to utilize this feature. If the Analog Comparator Multiplexer Enable bit (ACME in
ADCSRB) is set and the ADC is switched off (ADEN in ADCSRA is zero), and MUX2..0 in
ADMUX select the input pin to replace the negative input to the Analog Comparator, as shown in
Table
input to the Analog Comparator.
Table 23-2.
• Bit 0 – AIN0D: AIN0 Digital Input Disable
When this bit is written logic one, the digital input buffer on the AIN0 pin is disabled. The corre-
sponding PIN Register bit will always read as zero when this bit is set. When an analog signal is
applied to the AIN0 pin and the digital input from this pin is not needed, this bit should be written
logic one to reduce power consumption in the digital input buffer.
Bit
Read/Write
Initial Value
ACME
0
1
1
1
1
1
1
1
1
1
23-2. If ACME is cleared or ADEN is set, the Bandgap reference is applied to the negative
ADEN
7
–
R
0
Analog Comparator Multiplexed Input
x
1
0
0
0
0
0
0
0
0
6
–
R
0
MUX2..0
000
001
010
011
100
101
110
111
xxx
xxx
5
–
R
0
Analog Comparator Negative Input
Bandgap Ref.
Bandgap Ref.
ADC0
ADC1
N/A
ADC4
ADC5
ADC6
ADC7
4
–
R
0
3
–
R
0
2
–
R
0
1
–
R
0
ATmega16/32U4
0
AIN0D
R/W
0
DIDR1
291
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