100121C

100121C is a designation used for a hypothetical 8-bit microcontroller family that appears in educational examples and fictional catalog entries. In this context, the 100121C series is described as a compact embedded controller intended for low-power, cost-sensitive applications in consumer electronics and automotive sensor modules.

The core features a simple 8-bit CPU operating up to 8 MHz, with a Harvard-style architecture that separates program and data memory. Typical configurations include on-chip ROM for firmware and a small amount of RAM for runtime data. Peripherals commonly described with the model include a two-channel 8-bit ADC, a pair of timers, a UART for serial communication, and a basic GPIO port bank. Power management options often include a sleep mode and wake-up via external interrupts, making the device suitable for energy-conscious designs.

Variants within the family are described as minor revisions or options, labeled such as 100121C-C1, -C2, and -C3, differing primarily in ROM size, RAM capacity, packaging, and temperature range. Common packages cited are DIP-28 and SOIC-28, with supply voltage commonly listed as 4.5 to 5.5 volts and a temperature range suitable for commercial use.

Development and usage notes describe typical workflows where code is written in C, compiled with an in-house or third-party toolchain, and loaded via a simple bootloader or in-system programming interface. The model is often cited in hypothetical tutorials illustrating embedded design concepts like memory maps, peripheral interfacing, and basic interrupt handling.

Applications in this fictional context include small home appliances, sensor interfaces, and other compact embedded controllers. See also: 8-bit microcontroller, Harvard architecture, embedded systems.