The AT91M40400 is a member of the Atmel AT91 16/32-bit Microcontroller family which is based on the ARM7TDMI embedded processor. This processor has a highperformance 32-bit RISC architecture with a high-density 16-bit instruction set and very low power consumption. In addition, a large number of internally banked registers result in very fast exception handling, making the device ideal for real-time control applications. The AT91 ARM-based MCU family also features Atmel's high-density, nonvolatile memory technology. The on-chip Flash program memory is in-system programmable.
The AT91M40400 has a direct connection to off-chip memory, including Flash, through the External Bus Interface.
The device is manufactured using Atmel's high-density CMOS technology. By combining the ARM7TDMI microcon-troller core with an on-chip RAM and a wide range of peripheral functions on a monolithic chip, the Atmel AT91M-40400 is a powerful microcontroller that provides a flexible, costeffective solution to many computeintensive embedded control applications.
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• Incorporates the ARM7TDMI ™ ARM Thumb processor High-performance 32-bit RISC architecture High-density 16-bit instruction set Leader in MIPS/Watt Embedded ICE In Circuit Emulation• 4K bytes internal RAM• Fully programmable External Bus Interface (EBI) Maximum external address space of 64M bytes Up to eight chip selects Software programmable 8/16-bit external databus• Eight-level priority, individually maskable, vectored interrupt controller Four External interrupts, including a high priority low latency interrupt request• 32 Programmable I/O lines• Three-channel 16-bit timer/counter Three external clock inputs Two multi-purpose I/O pins per channel• Two USARTs Two dedicated Peripheral Data Controller (PDC) channels per USART• Programmable watchdog timer• Low-power idle and power-down modes• Fully static operation: 0 Hz to 33 MHz• 2.7V to 3.6V operating range• Available in a 100-lead TQFP package
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