Atmel ARM-based processors: Difference between revisions

Revision as of 17:17, 22 August 2009

Revision as of 03:21, 26 August 2009

Line 1:

'''AT91SAM''' ('''AT91SAM Smart ARM-based Microcontrollers''') are a family of [[Atmel]] chips based on the [[32-bit]] [[reduced instruction set computer|RISC]] microprocessors from [[ARM architecture|ARM]]<ref>[http://www.atmel.com/products/at91/ Atmel product website]</ref>. Some are targetted as applications processors, with external memory busses used to access RAM (SDRAM or DDR2) and flash, and large sets of integrated peripherals. When targetted as [[microcontroller]]s they include embedded [[flash memory|Flash]] and [[static random access memory|SRAM]] [[computer data storage|memories]] together with a number of [[peripheral]]s and standard communications and [[computer networking|networking]] [[bus (computing)|interface]]s. This qualifies them as [[system-on-a-chip]] devices.

The AT91SAM comes in [[ARM7TDMI|ARM7]], [[ARM9E|ARM9]] and [[ARM Cortex|Cortex M3]] versions.

External interfaces include [[Universal Serial Bus|USB]], [[controller-area network|CAN]], [[Ethernet]], [[Serial Peripheral Interface Bus|SPI]], [[USART]] and [[analog-to-digital converter|ADC]]. A [[direct memory access|DMA]] controller provides direct communication channels between external interfaces and memories, increasing [[data]] throughput with minimal [[central processing unit|processor]] intervention.