Nuvoton Technology Corporation

Wen-Shuo Chang

An electronic device includes an immutable memory, a counter, and a processor. The immutable memory stores a first public key and a second public key in advance, and the first public key and the second public key are unmodifiable. The counter has an anti-rollback protection and counts a counting value. When the counting value is a first value, the processor selects a first public key corresponding to the first value. When the counting value is a second value, the processor selects the second public key corresponding to the second value. When the counting value is a third value, the processor selects the first public key and the second public key. The first value and the second value are in a first state, and the third value is in a second state, where the first state and the second state are different.

Electronic device and public key replacement method thereof

A method for driving in-system programming is provided. The method includes receiving a set of driving codes; setting an in-system-programming flag according to the set of driving codes; executing a system reset after the in-system-programming flag is set; detecting whether there is an in-system-programming flag after the system reset is finished; and executing an in-system-programming procedure when an in-system-programming flag is detected.

Growing community of inventors

Hsinchu, Taiwan

Wen-Shuo Chang