ATmega644A Atmel Corporation, ATmega644A Datasheet - Page 137
ATmega644A
Manufacturer Part Number
ATmega644A
Description
Manufacturer
Atmel Corporation
Specifications of ATmega644A
Flash (kbytes)
64 Kbytes
Pin Count
44
Max. Operating Frequency
20 MHz
Cpu
8-bit AVR
# Of Touch Channels
16
Hardware Qtouch Acquisition
No
Max I/o Pins
32
Ext Interrupts
32
Usb Speed
No
Usb Interface
No
Spi
3
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
1.8 to 5.5
Operating Voltage (vcc)
1.8 to 5.5
Fpu
No
Mpu / Mmu
no / no
Timers
3
Output Compare Channels
6
Input Capture Channels
1
Pwm Channels
6
32khz Rtc
Yes
Calibrated Rc Oscillator
Yes
Available stocks
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Manufacturer
Quantity
Price
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Part Number:
ATmega644A-AU
Manufacturer:
Atmel
Quantity:
135
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16.11.7
16.11.8
16.11.9
16.11.10 ICR1H and ICR1L – Input Capture Register 1
8272C–AVR–06/11
OCR1BH and OCR1BL – Output Compare Register1 B
OCR3AH and OCR3AL – Output Compare Register3 A
OCR3BH and OCR3BL – Output Compare Register3 B
The Output Compare Registers contain a 16-bit value that is continuously compared with the
counter value (TCNT1). A match can be used to generate an Output Compare interrupt, or to
generate a waveform output on the OCnx pin.
The Output Compare Registers are 16-bit in size. To ensure that both the high and low bytes are
written simultaneously when the CPU writes to these registers, the access is performed using an
8-bit temporary High Byte Register (TEMP). This temporary register is shared by all the other
16-bit registers. See “Accessing 16-bit Registers” on page 113.
The Output Compare Registers contain a 16-bit value that is continuously compared with the
counter value (TCNT3). A match can be used to generate an Output Compare interrupt, or to
generate a waveform output on the OCnx pin.
The Output Compare Registers are 16-bit in size. To ensure that both the high and low bytes are
written simultaneously when the CPU writes to these registers, the access is performed using an
8-bit temporary High Byte Register (TEMP). This temporary register is shared by all the other
16-bit registers. See “Accessing 16-bit Registers” on page 113.
The Input Capture is updated with the counter (TCNT1) value each time an event occurs on the
ICPn pin (or optionally on the Analog Comparator output for Timer/Counter1). The Input Capture
can be used for defining the counter TOP value.
The Input Capture Register is 16-bit in size. To ensure that both the high and low bytes are read
simultaneously when the CPU accesses these registers, the access is performed using an 8-bit
Bit
(0x8B)
(0x8A)
Read/Write
Initial Value
Bit
(0x99)
(0x98)
Read/Write
Initial Value
Bit
(0x9B)
(0x9A)
Read/Write
Initial Value
Bit
(0x87)
(0x86)
Read/Write
Initial Value
ATmega164A/PA/324A/PA/644A/PA/1284/P
R/W
R/W
R/W
R/W
7
0
7
0
7
0
7
0
R/W
R/W
R/W
R/W
6
0
6
0
6
0
6
0
R/W
R/W
R/W
R/W
5
0
5
0
5
0
5
0
R/W
R/W
R/W
R/W
4
OCR1B[15:8]
0
4
OCR3A[15:8]
0
4
OCR3B[15:8]
0
4
0
OCR1B[7:0]
OCR3A[7:0]
OCR3B[7:0]
ICR1[15:8]
ICR1[7:0]
R/W
R/W
R/W
R/W
3
0
3
0
3
0
3
0
R/W
R/W
R/W
R/W
2
0
2
0
2
0
2
0
R/W
R/W
R/W
R/W
1
0
1
0
1
0
1
0
R/W
R/W
R/W
R/W
0
0
0
0
0
0
0
0
OCR1BH
OCR3AH
OCR3BH
OCR1BL
OCR3AL
OCR3BL
ICR1H
ICR1L
137
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