The Propeller 2 is a general-purpose 32-bit microcontroller with 8 symmetric processors called “cogs.” Each cog has 512 longs (2 KB) of memory from which it executes instructions. Each cog shares a 128-bit data bus to a central “hub” which has 126 KB of RAM and 2 KB of ROM. Most instructions execute in a single clock cycle, with certain math intensive operations taking up to 31 clock cycles to complete. The hub allows each cog round-robin access to the main hub RAM; depending on the hub’s access window relative to the cog, access to hub RAM can take up to 7 clocks (if the access window was just missed) or as little as 0 clocks (if the cog is next in line for the access window). Additionally, the developer has the ability to set a one-time settable encryption key in the chip to protect code downloaded to the chip. On system startup the chip will use this protected key decrypt the encrypted program that is stored externally in non-volatile EEPROM/FLASH. The encryption key is not accessible by any user code.
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Stop breadboarding and soldering – start making immediately! Adafruit’s Circuit Playground is jam-packed with LEDs, sensors, buttons, alligator clip pads and more. Build projects with Circuit Playground in a few minutes with the drag-and-drop MakeCode programming site, learn computer science using the CS Discoveries class on code.org, jump into CircuitPython to learn Python and hardware together, TinyGO, or even use the Arduino IDE. Circuit Playground Express is the newest and best Circuit Playground board, with support for CircuitPython, MakeCode, and Arduino. It has a powerful processor, 10 NeoPixels, mini speaker, InfraRed receive and transmit, two buttons, a switch, 14 alligator clip pads, and lots of sensors: capacitive touch, IR proximity, temperature, light, motion and sound. A whole wide world of electronics and coding is waiting for you, and it fits in the palm of your hand.