Macros

The MCU_* macros identify the target device and allow conditional inclusion and configuration. Metadata constants and enums are otherwise preferred.

• MCU_ATMEGA2560 — target identifier.
• MCU_HAS_* — peripheral feature flags; see Config.h for the complete list.
• MCU_PACKAGE_TQFP100, MCU_PACKAGE_CBGA100 — select one.
• MCU_GRADE_INDUSTRIAL_85C, MCU_GRADE_LOW_VOLTAGE — select one.
• MCU_REQUIRE_PACKAGE, MCU_REQUIRE_GRADE — require explicit package and grade selection at compile time.
• MCU_CLOCK_HZ — project-defined clock value, not a device header default.

A package or grade is never silently selected by this library.