Atmel is now sampling its SAM-L21 ultra-low power microcontrollers. The devices, originally announced in November use the Cortex M0+ core in an architecture that supports multiple low-power modes and peripherals that can co-operate without CPU intervention. The devices also incorporate as much as 256 Kbytes of Flash and 32 Kbytes of SRAM, making it capable of handling full networking protocol stacks.
SAM-L21 devices are designed to provide developers with multiple power-saving options. The MCU is organized to have five different power domains, allowing developers to gate power as well as clocks to peripherals. Further, those peripherals that remain active during low-power modes are capable of taking action without the need to wake the CPU or utilize system memory. An event system control block permits developers, for instance, to chain the operation of peripherals in an “if this then that” sequence so that an event occurring on one peripheral can trigger an action on another peripheral.
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