SD Card Protocol Complete Guide: Evolution from SD 1.0 to SD 8.0, Bus Modes and Speed Classes (2026 Practical Guide)
Comprehensive overview of 30 years of SD card protocol evolution, deep dive into SPI/1-bit/4-bit/UHS bus modes, CMD instruction set, speed classes (Class/UHS/Video), and SDSC/SDHC/SDXC/SDUC capacity differences, with embedded development practical points.