MCU clock configuration and external crystal oscillator selection
Configuring the clock source for a microcontroller ( MCU ) is a critical step in embedded system design, as it directly impacts the performance, power consumption, and reliability of the system. The clock source can be internal (e.g., an RC oscillator) or external (e.g., a crystal oscillator). Below is a detailed guide on MCU clock configuration and external crystal oscillator selection : 1. Clock Sources for MCUs MCUs typically support multiple clock sources, which can be categorized as: Internal Clock Sources RC Oscillator : Low-cost and integrated into the MCU. Lower accuracy (±1% to ±10%). Suitable for applications where precise timing is not critical. PLL (Phase-Locked Loop) : Multiplies the frequency of an internal or external clock. Provides higher frequencies for high-performance applications. External Clock Sources Crystal Oscillator : High accuracy (±10 ppm to ±100 ppm). Requires external crystal and load capacitors. Ideal for applications requirin...