Silicon Laboratories C8051F505-IM QFN(48) 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 7FFFhcan be set through Device Configure menu and programmed with Secure command.In order to program Write/Read Lock Byte please enable Secure.The Lock Byte number is stored in FLASH address 7FFFh in ones complement’ form that is a 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 locked then the FLASH page containing the LockByte 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 containing the Lock Byte addresses [7E00h to 7FFEh].The only way to remove the protection is executing a Chip Erase operation. ‘