Details

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BUY AT89C51RD2-SLSUM https://www.utsource.net/itm/p/11249048.html

Parameter	Description	Value/Range
Device Type	8-bit Microcontroller with Flash Memory	AT89C51RD2
Package	Plastic Thin Quad Flat Pack (TQFP)	44-Pin
Operating Voltage (VCC)	Supply Voltage for the Device	2.7 V to 6.0 V
Clock Frequency	System Clock Input	0 Hz to 33 MHz
Flash Memory	On-chip Program Memory	64 KB
EEPROM	On-chip Data Memory	1 KB
RAM	On-chip Internal RAM	2.5 KB
I/O Ports	General Purpose Input/Output Ports	32
Timers/Counters	On-chip Timers/Counters	3
Serial Communication	UART, SPI, I2C	Yes
Watchdog Timer	On-chip Watchdog Timer	Yes
Power Management	Low Power Modes	Idle, Power Down
Interrupts	Number of Interrupt Sources	14
Programming Interface	In-System Programming (ISP) and In-Application Programming (IAP)	Yes
Temperature Range	Operating Temperature Range	-40°C to +85°C
Package Marking	Device Marking on Package	AT89C51RD2-SLSUM

Instructions for Use

1. Power Supply:

   • Connect the VCC pin to a power supply within the range of 2.7 V to 6.0 V.
   • Connect the GND pin to the ground.

2. Clock Configuration:

   • Connect an external crystal oscillator or clock source to the XTAL1 and XTAL2 pins for system clock generation.
   • The maximum clock frequency is 33 MHz.

3. Program Memory:

   • Use the ISP or IAP methods to program the 64 KB Flash memory.
   • Ensure that the programming voltage (VPP) is applied correctly if using an external programmer.

4. Data Memory:

   • The 1 KB EEPROM can be used for non-volatile data storage.
   • Access the 2.5 KB internal RAM for temporary data storage.

5. I/O Ports:

   • Configure the 32 I/O ports as input or output using the appropriate register settings.
   • Use pull-up resistors for open-drain outputs if necessary.

6. Timers/Counters:

   • Initialize and configure the three timers/counters using the TCON and TMOD registers.
   • Use the timers for delay generation, PWM, or event counting.

7. Serial Communication:

   • Enable and configure the UART, SPI, and I2C interfaces for serial communication.
   • Set the baud rate and other parameters as required.

8. Watchdog Timer:

   • Enable the watchdog timer to reset the microcontroller if it hangs.
   • Clear the watchdog timer periodically to prevent a reset.

9. Low Power Modes:

   • Enter idle mode to reduce power consumption while keeping the CPU active.
   • Enter power-down mode to minimize power consumption by stopping the CPU and peripherals.

10. Interrupt Handling:

    • Set up interrupt vectors and enable interrupts using the IE and IP registers.
    • Write interrupt service routines (ISRs) to handle specific events.

11. Reset:

    • Apply a high-level signal to the RST pin to reset the microcontroller.
    • Ensure that the reset pulse is at least 100 ms long for reliable operation.

12. Thermal Considerations:

    • Ensure adequate heat dissipation for the device, especially under heavy load conditions.
    • Use a heatsink if necessary.

13. Storage and Handling:

    • Store the device in a dry, static-free environment.
    • Handle the device with ESD protection to avoid damage.

For detailed programming and application notes, refer to the AT89C51RD2 datasheet and application manuals provided by Atmel.

(For reference only)