Details

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BUY ATMEGA644PA-AUR https://www.utsource.net/itm/p/12605976.html

Parameter	Description	Value
Package	Package type	44-PDIP, 44-TQFP
Operating Voltage (Vcc)	Supply voltage range	2.7 - 5.5 V
Clock Speed	Maximum clock frequency	20 MHz
Flash Memory	Program memory size	64 KB
EEPROM	EEPROM size	2 KB
SRAM	SRAM size	4 KB
I/O Pins	Number of I/O pins	32
ADC Channels	Number of analog-to-digital converter channels	8
ADC Resolution	Resolution of the ADC	10 bits
PWM Channels	Number of PWM channels	6
Timers/Counters	Number of timers/counters	3 (1 x 16-bit, 2 x 8-bit)
Serial Communication	Supported serial communication protocols	SPI, UART, I2C
Watchdog Timer	Watchdog timer available	Yes
Interrupt Sources	Number of interrupt sources	21
Temperature Range	Operating temperature range	-40掳C to 85掳C
Programming Interface	Programming interface supported	ISP, JTAG
Power Consumption	Typical power consumption at 3.3V, 20MHz	15 mA

Instructions for Use

1. Power Supply:

   • Connect the Vcc pin to a stable power supply within the operating voltage range (2.7V to 5.5V).
   • Connect the GND pin to the ground.

2. Clock Configuration:

   • Use an external crystal or oscillator for the clock source if required.
   • Alternatively, configure the internal RC oscillator for lower precision applications.

3. Program Memory:

   • Use an ISP programmer to upload code to the Flash memory.
   • Ensure the programming voltage (Vpp) is applied correctly if using high-voltage programming.

4. I/O Configuration:

   • Configure the I/O pins as inputs or outputs using the DDRx registers.
   • Set the initial state of the pins using the PORTx registers.

5. Analog-to-Digital Conversion:

   • Initialize the ADC by setting the appropriate bits in the ADMUX and ADCSRA registers.
   • Start a conversion by writing to the ADCSRA register.

6. PWM Configuration:

   • Set up the PWM mode and prescaler in the TCCRnA and TCCRnB registers.
   • Configure the OCRnA and OCRnB registers to set the PWM duty cycle.

7. Timers/Counters:

   • Initialize the timers/counters by configuring the TCCRnA and TCCRnB registers.
   • Use the TCNTn register to read or write the timer value.
   • Enable interrupts if needed by setting the appropriate bits in the TIMSKn register.

8. Serial Communication:

   • Configure the USART, SPI, or I2C interfaces by setting the appropriate control and status registers.
   • Use the UDR, SPDR, or TWDR registers for data transmission and reception.

9. Watchdog Timer:

   • Enable the watchdog timer by setting the WDE bit in the WDTCSR register.
   • Reset the watchdog timer periodically to prevent a system reset.

10. Interrupts:

    • Enable global interrupts by setting the I bit in the SREG register.
    • Enable specific interrupts by setting the corresponding bits in the appropriate interrupt mask registers.

11. Low Power Modes:

    • Enter low power modes (idle, power-down, etc.) by setting the appropriate bits in the MCUCR register.
    • Wake up from low power modes using interrupts or external triggers.

12. Reset Handling:

    • Ensure proper reset handling by connecting a capacitor between the RESET pin and GND.
    • Use the MCUSR register to determine the cause of the last reset.

By following these instructions, you can effectively utilize the ATMEGA644PA-AUR microcontroller in your projects.

(For reference only)