Flash memory register programming mode of operation

FreescaleIn-chipFlashThe programming operations are divided into: erase and write. Erasure is the use of the contents of a memory unit by binary0become1, while the write operation is the opposite, is made up of the contents of the storage cell1become0。 Wipe, write operations are all through setting or clearingFlashControlling a bit in the accumulator is done.

FlashInside the slice, it is organized on a page-by-page basis. The size of the page and row varies with the wholeFlashThe size varies, and the page is always twice the size of the row. Newly launchedMC68HC908LD64Will be in-chipFlashThere are two regions, each of which defines the size of the page differently. RightFlash's erase operations are page-based, while write operations are row- or page-based.

1、  Flash becomes a register

andFlashThere are two registers related to programming operations:FlashControl registers and FlashBlock protection registers.

2、  Flash programming steps

RightFlashWhen performing erase or write-like operations, certain timing and procedures need to be followed. aboutMC68GC908Series microcontroller, these steps are the same, but the timing requirements may be slightly different, users refer to the corresponding chip manual according to the specific situation.