AT91SAM 32 bit ARM® RISC MCUs

ATSAM3S series includes 18 general-purpose Cortex®-M3 based Flash microcontrollers that improve impedance matching, simplify PCB design and save 50 percent power at 1 MHz operation with a consumption of only 2.3 mW.
At maximum operating frequency of 64 MHz the device consumes 1.45 mW / MHz.

The SAM3S is a member of Atmel's Flash microcontroller family based on the high-performance 32-bit ARM Cortex-M3 RISC processor. It provides processing power and features such as system control, sensor interfaces, 64k to 256 kByte (512K in spec.) Flash memory options, an optional external parallel bus interface, connectivity capabilities and user interface support. Additional features include On-Die Termination (ODT), USB Device, SDIO, Parallel PIO signal capture, 12-bit ADC and DAC, 4 UARTs, dual I2C, I2S, timers, unique chip ID, and power and reset management.
The SAM3S’s supply voltage ranges from 1.62 to 3.6V operation and package options from 48-pin QFP and QFN up to 100-pin QFP and BGA.

Atmel's SAM3S also expands market opportunities in applications including consumer, industrial control, metering, toys, medical, test and measurement, 802.15.4 wireless networking, PC, cell phone and gaming peripherals.

Pin-to-pin compatibility between SAM3S and SAM7S MCUs

The SAM3S series is the ideal Cortex-M3 upgrade path for the  SAM7S and SAM7SE, Atmel's best-selling ARM® Flash MCU. With the Cortex-M3 core running at a maximum clock rate of 64 MHz at 1.8V, 85°C, the SAM3S Flash MCU brings a 50 percent raw performance increase over the SAM7S series. In its 64-pin version, the SAM3S is pin-to-pin compatible with the SAM7S, enabling customers to upgrade performance while hardware remains unchanged to preserve investments previously made.

Free built-in Flash programmer:

All SAM7, SAM3 and SAM9 MCUs integrate the ability to program whole Flash and associated Security/Lockbits without any additional hardware tools via USB or UART.

You can get the free appropriate Windows® program SAM-BA from www.atmel.com.

Click to enlarge SAM3S-EK Evaluation Kit: SAM3S-Startup Bundle

System CPU ARM Cortex™-M3 rev2, 64 MHz, MPU Debug JTAG Memory Flash 64K/128K/256K SRAM 16K/32K/48K Ext. Bus. 8-bit (100pin only) Static, NAND DMA Up to 22 PDC Boot Flash, SAM-BA ROM Communication USB 1 USB2.0 FS device (8 EP) U(S)ART 2 +2 with DMA SPI 1 with DMA TWI (I²C) 2 with DMA (Master) SSC 1 with DMA Timer 16-bit 6 x with Cap/Com PWM 4 x 16-bit , DR, DMA RTT/RTC 1/1 [Battery] Systick In CM3 core Watchdog 1 Analog ADC Up to 16 ch 12-bit diff, DMA DAC Up to 2 x 12-bit Comparator 1 Temp.Sensor 1x(ADC) CRC CRCCU Unit Misc. QDEC 2 Quadrature Decoder I/O 79 max. AC97 6 Channel V2.2 System POR, BOD, LDO Security Flash+JTAG Security Bit Lock regions