datasheet:

UBC[7:0] User boot code area

0x00: no UBC, no write-protection

0x01: Page 0 to 1 defined as UBC, memory write-protected

0x02: Page 0 to 3 defined as UBC, memory write-protected

0x03: Page 0 to 4 defined as UBC, memory write-protected

...

0x3E: Pages 0 to 63 defined as UBC, memory write-protected

Other values: Reserved

Note: Refer to the family reference manual (RM0016) section on

Flash write protection for more details.

我的bootload為4K即為4096/128=32頁，那么opt1=32-2=30，但是當opt1為此值時發現0x9000處不能寫，后用stvp實驗發現當opt1=6時恰好前4k寫保護。

有關stm8s的UBC參數問題的問與答：

問：芯片的具體型號？
答：stm8s105c6

問：對于STM8S105C6而言，Flash的每頁是512字節。
答：1page=4blocks!!

問：錯，應該是：1page = 512bytes
答：也不對，看pm手冊。

好的，現在我們粘出PM手冊供大家參考：



好了，我們討論到這里，相信你也懂了，歡迎大家繼續在此處留言討論，帶所有人都懂得stm8s的UBC參數問題。