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AT91 ARM Thumb Microcontroller Atmel's AT91 series of ARM Thumb-based microcontrollers have been specially designed to meet 32-bit performance and aggressive low-power targets at 16-bit system costs. Powerful, Flexible Architecture  The AT91 microcontrollers are based on the industry-leading
ARM7TDMI™ processor. This processor has a high-performance 32-bit RISC architecture with a
high-density 16-bit instruction set and very low power consumption. It is a market leader in terms
of MIPS/Watt.The AT91 family enhances the capacity of the ARM processor core with a powerful and flexible set of memory blocks, peripherals and external interfaces. On-chip memories include SRAM, Flash and ROM. The fully programmable External Bus Interface (EBI) provides a direct connection to off-chip memory as fast as one clock cycle for a read or write operation. A Multi-Processor Interface enables high-speed connections to external processors or DSPs. An eight-level priority vectored interrupt controller in conjunction with the Peripheral Data Controller (PDC) significantly improves the real-time performance of the devices. The PDC permits data transfers between memory and serial peripherals such as the USART with minimal processor intervention. Other peripherals include Timers, Serial Peripheral Interfaces, Real-Time Clocks, Watchdog Timers and high-bandwidth ADCs and DACs. The AT91 series is manufactured using Atmel's high-density CMOS technology. Development Tools Atmel's AT91 series microcontrollers are completely supported by state-of-the-art development tools, including C-compilers, Assemblers, Real-Time Operating Systems and software debug tools. A low-cost evaluation kit, the AT91EB01, is a convenient means to evaluate the features of the devices. Atmel works closely with a number of third-party suppliers, prominent amongst whom is Green Hills, to ensure that customers receive full support in all aspects of their application development on the AT91. Applications Target applications for the AT91 series include hand-held devices such as portable telephones, GPS, payphones, point of sales terminals and networking.
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