AT91SAM9260B-QU Overview

AT91SAM9260B-QU is a high-performance microprocessor in the Atmel® | SMART family. It is based on the ARM926EJ-S™ core and integrates fast ROM, RAM, and many peripheral resources. It is suitable for embedded systems that need strong processing power and rich interface options.

The chip includes many interfaces, such as an Ethernet MAC, a USB Device port, and a USB Host controller. It also provides standard peripherals like USART, SPI, TWI, timers, a Synchronous Serial Controller (SSC), an ADC, and a Multimedia Card interface. These features make it easy to handle different data communication and peripheral control tasks.

In addition, AT91SAM9260B-QU uses a 6-layer matrix architecture that supports up to six 32-bit buses running in parallel. The built-in External Bus Interface (EBI) supports many types of external memory. This helps the system expand program and data storage and improves overall flexibility.

AT91SAM9260B-QU Specifications

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AT91SAM9260B-QU Highlights

80 MHz ARM926EJ-S™ ARM® Thumb® Processor

̶ 8 Kbytes Data Cache, 8 Kbytes Instruction Cache, MMU

Memories

̶ 32-bit External Bus Interface supporting 4-bank SDRAM/LPSDR, Static

Memories, CompactFlash, SLC NAND

Flash with ECC

̶ Two 4-Kbyte internal SRAM, single-cycle access at system speed

̶ One 32-Kbyte internal ROM, embedding bootstrap routine

Peripherals

̶ ITU-R BT. 601/656 Image Sensor Interface (ISI)

̶ USB Device and USB Host with dedicated On-Chip Transceiver

̶ 10/100 Mbps Ethernet MAC Controller (EMAC)

̶ One High Speed Memory Card Host

̶ Two Master/Slave Serial Peripheral Interfaces (SPI)

̶ Two 3-channel 32-bit Timer/Counters (TC)

̶ One Synchronous Serial Controller (SSC)

̶ One Two-wire Interface (TWI)

̶ Four USARTs

̶ Two UARTs

̶ 4-channel 10-bit ADC

System

̶ 90 MHz six 32-bit layer AHB Bus Matrix

̶ 22 Peripheral DMA Channels

̶ Boot from NAND Flash, DataFlash or serial DataFlash

̶ Reset Controller (RSTC) with On-Chip Power-on Reset

̶ Selectable 32.768 kHz Low-Power and 3–20 MHz Main Oscillator

̶ Internal Low-Power 32 kHz RC Oscillator

̶ One PLL for the system and one PLL optimized for USB

̶ Two Programmable External Clock Signals

̶ Advanced Interrupt Controller (AIC)

̶ Debug Unit (DBGU)

̶ Periodic Interval Timer (PIT)

̶ Watchdog Timer (WDT)

̶ Real-time Timer (RTT)

I/O

̶ Three 32-bit Parallel Input/Output Controllers

̶ 96 Programmable I/O Lines Multiplexed with up to Two Peripheral I/Os

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AT91SAM9260B-QU Block Diagram

Core Processing Unit and Memory Structure

The AT91SAM9260B-QU is based on the ARM926EJ-S core and serves as the main processor, responsible for overall system data processing and control. The processor integrates an instruction cache (I-Cache) and a data cache (D-Cache) to enhance instruction execution and data access efficiency. Connected to it are on-chip ROM (32 KB) and fast SRAM (two blocks of 16 KB each), providing fundamental storage support for program storage and rapid data exchange.

Peripheral Interfaces and Data Acquisition Capabilities

The chip features a rich set of peripheral interfaces, including Ethernet MAC, image sensor interface, USB 2.0 OTG controller, SPI, TWI, USART, PWM, and more, supporting a wide range of applications. Through the DMA (Direct Memory Access) module, these peripherals can transfer data efficiently without occupying the CPU, improving overall system performance. The chip also integrates a 4-channel, 10-bit ADC for analog signal acquisition and conversion.

System Management and Expansion Capabilities

The AT91SAM9260B-QU provides extensive system control modules, including a Power Management Controller (PMC), Real-Time Clock (RTC), Watchdog Timer (WDT), and Reset Controller (RSTC), ensuring stable system operation and power management. For external memory expansion, the chip supports SDRAM, CompactFlash, NAND Flash, and other memories, connected via the External Bus Interface (EBI), meeting large-capacity data storage requirements.

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Where to Use AT91SAM9260B-QU?

The AT91SAM9260B-QU features a rich set of peripheral interfaces, powerful data processing capabilities, and flexible memory expansion options, making it suitable for a wide range of embedded systems and industrial applications. It can be widely used in industrial control, communication terminals, data acquisition devices, and more. The main application areas are detailed below:

1. Embedded Systems

l  Used in embedded platforms such as smart home devices, IoT equipment, and automotive systems.

l  Supports multiple peripheral interfaces, including SPI, USART, TWI, and PWM, which can connect sensors, display modules, and controllers to implement complex data processing and control logic.

l  Built-in high-speed SRAM and ROM provide stable program execution and fast data exchange, ensuring real-time responsiveness of embedded devices.

2. Industrial Control

l  Suitable for industrial automation control systems, such as PLC controllers, robotic control terminals, and production line monitoring systems.

l  The integrated DMA module and 10-bit ADC enable high-speed data acquisition and real-time control without heavily occupying CPU resources.

l  System stability and reliability are ensured through the Power Management Controller (PMC), Watchdog Timer (WDT), and Reset Controller (RSTC).

3. Communication Terminals

l  Can be used in Ethernet terminals, network routers, smart gateways, and other communication devices.

l  Built-in Ethernet MAC and USB OTG controller support high-speed data transfer and multitasking communication processing.

l  Supports multiple protocol interfaces such as SPI and USART, enabling connection to external communication modules for flexible network expansion.

4. Data Acquisition and Processing Devices

l  Suitable for environmental monitoring, industrial testing, laboratory instruments, and other data acquisition systems.

l  The integrated 4-channel 10-bit ADC performs analog signal acquisition and conversion.

l  Combined with external memory expansion such as SDRAM, NAND Flash, or CompactFlash, it supports large-capacity data storage and fast processing.

5. Other Embedded Applications

l  Applicable to image processing, video capture, intelligent control terminals, and other scenarios requiring high-performance computing and rich peripheral support.

l  On-chip caches (I-Cache and D-Cache) optimize instruction execution efficiency and data access speed.

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How to Use AT91SAM9260B-QU?

The AT91SAM9260B-QU is a 32-bit embedded microprocessor based on the ARM926EJ-S core. Before use, hardware and software environments need to be set up:

Hardware

PQFP208 package, following SMT installation standards.

Power supply 1.65V–1.95V; connect Ethernet, I²C, USB, and other peripherals.

Observe ESD precautions.

Software

Install the ARM GNU toolchain; Eclipse + OpenOCD or MDK IDE can also be used.

Configure compiler and target device; example projects can be used for quick start.

Development & Debugging

Write applications in C/C++ (e.g., UART, Ethernet).

Compile to binaries and program via JTAG or SAM-BA; for debugging, programs can run in SDRAM.

Use DNW, serial terminal, or GDB for remote debugging.

Boot sequence checks DataFlash first; if no program is found, internal ROM runs, helping to troubleshoot startup issues.

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