 The MCUs also integrate internal voltage regulators for simplified, more compact system designs.In addition to CPU and clock rate flexibility for specific applications, the EFM32 portfolio offers a broad range of memory resource options, for application storage (Flash), application execution (RAM), and other needs such as RTOS implementation.Devices include internal Flash memory as low as 4 kB and as high as 1024 kB, and RAM as low as 2 kB and as high as 128 kB.