--- title: "Introduction to Microcontrollers" url: https://daily.dev/posts/introduction-to-microcontrollers-rdkeutnre source_url: https://www.embeddedrelated.com/showarticle/485.php type: article source: "EmbeddedRelated" published: 2026-05-31T07:48:29.300Z updated: 2026-06-04T02:17:03.549Z tags: ["embedded", "stm32"] reading_time: 27 upvotes: 0 comments: 0 language: en --- > ## Documentation Index > Fetch the complete documentation index at: https://daily.dev/llms.txt > Use this file to discover all available pages before exploring further. # Introduction to Microcontrollers **[EmbeddedRelated](https://daily.dev/sources/embeddedrelated)** · 27 min read · 0 upvotes · 0 comments ## Summary Part 9 of a microcontroller tutorial series covering how to simulate parallel task execution on a single-core MCU using a single hardware timer. Explains a millisecond-tick ISR approach where each task is assigned a deadline, and a cyclic executive main loop checks those deadlines each iteration. Covers safe deadline comparison using 2s complement signed arithmetic to handle timer rollover, ISR race conditions on 8-bit devices requiring atomic access, and the SysTick timer on STM32. Includes a complete STM32 LCD driver using atomic GPIO BSRR/BRR registers, a timer-based ms_delay(), and a working demo with two counters, an LCD display, and button-driven resets. Also discusses an optimization-level bug where clearing an interrupt flag too late caused double-firing of the ISR. ## Full article daily.dev links to this article rather than hosting it. Read it at the original source: --- Tags: [#embedded](https://daily.dev/tags/embedded), [#stm32](https://daily.dev/tags/stm32) [View this post on daily.dev](https://daily.dev/posts/introduction-to-microcontrollers-rdkeutnre)