Details

---

BUY AT91SAM7S256D-AU https://www.utsource.net/itm/p/11249119.html

Parameter	Description	Value
Part Number	Full Part Number	AT91SAM7S256D-AU
Package	Package Type	100-pin LQFP (LH)
Operating Voltage	Supply Voltage Range	3.0V to 3.6V
Operating Temperature	Temperature Range	-40°C to +85°C
Microcontroller Core	ARM7TDMI-S Core	32-bit RISC processor
Clock Speed	Maximum Clock Frequency	72 MHz
Flash Memory	On-chip Flash Memory	256 KB
SRAM	On-chip SRAM	64 KB
Data EEPROM	On-chip Data EEPROM	4 KB
Programmable Watchdog Timer	WDT	Yes
Real-Time Clock	RTC	Yes
Timers	Number of Timers	4 x 32-bit Timer/Counters
Serial Interfaces	UARTs	2 x USART (Universal Synchronous/Asynchronous Receiver/Transmitter)
SPI	SPI Interfaces	1 x SPI (Serial Peripheral Interface)
I2C	I2C Interfaces	1 x TWI (Two-Wire Interface)
USB	USB Interface	1 x Full-Speed USB Device Port
Analog-to-Digital Converter (ADC)	ADC Channels	10-bit, 8 channels
Digital-to-Analog Converter (DAC)	DAC Channels	1 x 8-bit DAC
General Purpose I/O (GPIO)	Number of GPIO Pins	74
Interrupt Controller	Nested Vectored Interrupt Controller (NVIC)	Yes
Power Management	Low-Power Modes	Sleep, Wait, Backup
Debug Interface	JTAG/SWD	Yes
Programming Interface	In-System Programming (ISP)	Yes
Package Dimensions	Length x Width x Height	14 mm x 14 mm x 1.4 mm

Instructions for Use:

1. Power Supply:

   • Ensure the supply voltage is within the specified range (3.0V to 3.6V).
   • Use decoupling capacitors close to the power pins to minimize noise.

2. Clock Configuration:

   • Configure the internal RC oscillator or external crystal oscillator as per the application requirements.
   • The maximum clock frequency is 72 MHz.

3. Flash Memory:

   • Program the on-chip flash memory using the ISP interface or through the USB port.
   • Use the provided software tools for programming and debugging.

4. GPIO Configuration:

   • Configure the GPIO pins as inputs or outputs based on the application needs.
   • Use pull-up or pull-down resistors if necessary.

5. Serial Communication:

   • Initialize the UART, SPI, and I2C interfaces according to the communication protocol requirements.
   • Configure baud rates, data formats, and other settings as needed.

6. ADC and DAC:

   • Configure the ADC to sample analog signals from the input channels.
   • Use the DAC to generate analog output signals.

7. Interrupt Handling:

   • Set up interrupt vectors and priorities in the NVIC.
   • Write interrupt service routines (ISRs) to handle specific events.

8. Low-Power Modes:

   • Implement sleep, wait, or backup modes to reduce power consumption when the microcontroller is idle.
   • Use the real-time clock (RTC) to wake up the microcontroller at regular intervals.

9. Debugging:

   • Connect the JTAG/SWD interface to a debugger for code development and testing.
   • Use the provided development tools for debugging and profiling.

10. USB Configuration:

    • Initialize the USB device port for communication with a host.
    • Implement USB device class drivers as required by the application.

11. Watchdog Timer:

    • Configure the watchdog timer to reset the microcontroller if the software hangs.
    • Ensure the watchdog timer is periodically reset during normal operation.

12. Data EEPROM:

    • Use the on-chip data EEPROM to store non-volatile data.
    • Follow the write cycle limits and endurance specifications to avoid premature wear-out.

For detailed information and specific register configurations, refer to the AT91SAM7S256D-AU datasheet and user manual.

(For reference only)