ATmega645 Atmel Corporation, ATmega645 Datasheet - Page 197
![no-image](/images/manufacturer_photos/0/0/79/atmel_corporation_sml.jpg)
ATmega645
Manufacturer Part Number
ATmega645
Description
Manufacturer
Atmel Corporation
Specifications of ATmega645
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
54
Ext Interrupts
17
Usb Speed
No
Usb Interface
No
Spi
2
Twi (i2c)
1
Uart
1
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
1.8 to 5.5
Operating Voltage (vcc)
1.8 to 5.5
Fpu
No
Mpu / Mmu
no / no
Timers
3
Output Compare Channels
4
Input Capture Channels
1
Pwm Channels
4
32khz Rtc
Yes
Calibrated Rc Oscillator
Yes
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Part Number:
ATmega645-16AU
Manufacturer:
ATMEL/爱特梅尔
Quantity:
20 000
Company:
Part Number:
ATmega645-16MU
Manufacturer:
ATECH
Quantity:
729
Part Number:
ATmega645-16MU
Manufacturer:
ATMEL/爱特梅尔
Quantity:
20 000
Part Number:
ATmega6450-16AU
Manufacturer:
ATMEL/爱特梅尔
Quantity:
20 000
Company:
Part Number:
ATmega6450P-AU
Manufacturer:
Atmel
Quantity:
360
Company:
Part Number:
ATmega6450P-AUR
Manufacturer:
Atmel
Quantity:
1 500
Part Number:
ATmega6450V-8AI
Manufacturer:
ATMEL/爱特梅尔
Quantity:
20 000
Part Number:
ATmega6450V-8AU
Manufacturer:
ATMEL/爱特梅尔
Quantity:
20 000
22. Analog Comparator
2570N–AVR–05/11
The Analog Comparator compares the input values on the positive pin AIN0 and negative pin
AIN1. When the voltage on the positive pin AIN0 is higher than the voltage on the negative pin
AIN1, the Analog Comparator output, ACO, is set. The comparator’s output can be set to trigger
the Timer/Counter1 Input Capture function. In addition, the comparator can trigger a separate
interrupt, exclusive to the Analog Comparator. The user can select Interrupt triggering on com-
parator output rise, fall or toggle. A block diagram of the comparator and its surrounding logic is
shown in
The Power Reduction ADC bit, PRADC, in
abled by writing a logical zero to be able to use the ADC module.
Figure 22-1. Analog Comparator Block Diagram
Notes:
ADC MULTIPLEXER
1. See
2. Refer to
Figure
REFERENCE
ACME
ADEN
BANDGAP
OUTPUT
page 72
Table 22-1 on page
(1)
22-1.
ACBG
Figure 1-1 on page
for Analog Comparator pin placement.
198.
2,
Figure 1-2 on page
“Power Reduction Register” on page 37
ATmega325/3250/645/6450
(2)
3, and
“Alternate Functions of Port E” on
must be dis-
197