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guys correct me if i am wrong, from my experience maximum frequency of GPIO pin state changing is =( Fosc- total Instruction cycle frequency required for pin change) .But in some latest MCU's(like STM32F series ) having option for user defined Speed .
The maximum frequency of I/O state changes are typically dependent on several factors, largely device dependent and are usually stated in the specific device's datasheet:
Example Reference: dsPIC30F2010 Datasheet, Table: 22-19: CLKO AND I/O TIMING REQUIREMENTS, Page: 160
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