Silicon Laboratories C8051F34A-GQ QFP(32) Device

Adapters for Automated Programmers

Adapters for Manual Programmers

Adapters for Engineering Programmers

Last Updated: 05/18/2023

IMPORTANT: Microcontroller with Flash Program Memory. The Write/Read Lock Byte at FLASH address FBFFhcan be set through Device Configure menu and programmed with Secure command.Device address [FC00h-FFFFh] are reserved and not mapped into buffer.In order to program Write/Read Lock Byte please enable Secure.The Lock Byte number is stored in FLASH address FBFFh in ones complement’ form that isa number whose ‘0’ bits have been replaced with ‘1’s and whose ‘1’ bits have been replacedwith ‘0’s. The FLASH pages are locked starting with page 0 whichcontains FLASH addresses [0000h to 01FFh] and are locked consecutivelyfrom there. Thus it is not possible to lock the second page of FLASHwithout also locking the first page of FLASH. If any FLASH pages are lockedthen the page [FA00h to FBFEh] containing the Lock Byte is also locked.For example: To lock the first 3 pages of FLASH addresses [0000h to 05FFh]the one complement of ‘00000011b’ is ‘11111100b’ or FCh.thus write FCh to the Lock Byte address. This would alsoautomatically protect the page [FA00h to FBFEh] containing the Lock Byte.The only way to remove the protection is executing a Chip Erase operation. ‘