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Specifications
SKU: 1551862
AT91 ARM THUMB-BASED MICROCONTROLLERS
| Parameter | Description | Value |
|---|---|---|
| Part Number | Device Identifier | AT91SAM7S256-AU |
| Package Type | Package Style | 100-pin LQFP (Quad Flat Package) |
| Operating Voltage (VDD) | Supply Voltage Range | 3.0 V to 3.6 V |
| Core | Processor Core | ARM7TDMI |
| Clock Speed | Maximum Clock Frequency | 72 MHz |
| Flash Memory | On-Chip Flash Memory Size | 256 KB |
| SRAM | On-Chip SRAM Size | 64 KB |
| Data Width | Data Bus Width | 32-bit |
| Temperature Range | Operating Temperature Range | -40°C to +85°C |
| I/O Pins | Number of I/O Pins | 64 |
| Timers | Number of Timers | 4 (32-bit) |
| USARTs | Universal Synchronous/Asynchronous Receiver-Transmitter | 3 |
| SPIs | Serial Peripheral Interface | 1 |
| TWIs | Two-Wire Interface (I2C) | 1 |
| PWM Channels | Pulse Width Modulation Channels | 4 |
| ADC | Analog-to-Digital Converter | 10-bit, 8 channels |
| DAC | Digital-to-Analog Converter | 10-bit, 1 channel |
| Watchdog Timer | Watchdog Timer | 1 |
| Real-Time Clock (RTC) | Real-Time Clock | 1 |
| Interrupt Controller | Nested Vectored Interrupt Controller (NVIC) | Yes |
| Power Management | Low Power Modes | Sleep, Wait, Backup |
| JTAG Support | Joint Test Action Group (JTAG) | Yes |
| Debug Interface | Debug Communication Channel (DCC) | Yes |
| Programming Interface | In-System Programming (ISP) | Yes |
| Package Dimensions | Physical Size | 14 mm x 14 mm x 1.4 mm |
Instructions for Use
Power Supply:
- Ensure the supply voltage (VDD) is within the range of 3.0 V to 3.6 V.
- Connect the ground (GND) pin to a stable ground reference.
Clock Configuration:
- The device supports both internal and external clock sources. For external clocks, connect an oscillator or crystal to the appropriate pins (XIN and XOUT).
- Configure the clock source and prescaler settings via the system control register.
Reset:
- Apply a reset signal to the NRST pin to initialize the device.
- Ensure the reset signal is held low for at least 100 ns.
Programming:
- Use the JTAG interface for programming and debugging.
- Alternatively, use the ISP (In-System Programming) method via the USART or SPI interfaces.
Low Power Modes:
- Enter low power modes (Sleep, Wait, Backup) by configuring the power management registers.
- Use the watchdog timer to ensure reliable operation in low power modes.
Peripherals:
- Configure the peripherals (USARTs, SPI, TWI, ADC, DAC, etc.) using the corresponding control registers.
- Refer to the device datasheet for detailed register maps and configuration examples.
Interrupt Handling:
- Set up interrupt vectors and priorities using the NVIC (Nested Vectored Interrupt Controller).
- Write interrupt service routines (ISRs) to handle specific events.
Debugging:
- Use the DCC (Debug Communication Channel) for real-time data exchange between the debugger and the target device.
- Utilize breakpoints and watchpoints for efficient debugging.
Environmental Considerations:
- Operate the device within the specified temperature range (-40°C to +85°C) to ensure reliable performance.
- Ensure proper heat dissipation if operating at high frequencies or under heavy loads.
For more detailed information, refer to the AT91SAM7S256-AU datasheet and application notes provided by Atmel.
(For reference only)Inquiry - AT91SAM7S256-AU
