????W25QXX SPI Flash?????
?????EEPROM?????SPI Flash??洢????????????????????硣??W25Q16?????16Mb?????2MB??????AT24C08о???1KB????2048?????????????????????SPI???????????????д????W25Qxx??SPI????????80MHz??????IIC????????????????????????????STM32???????IIC??????????????????????????????????????????IIC????STM32??SPI???????????SPI Flash????????????????????????Nand flash??????Nor flash??????Flash?洢?????????????д???????????в?????????????STM32???????????Flash?????б?????????????????????д???????SPI Flash?????????д??????????????EEPROM??????????????????????д???д?????????W25Qxx??е?Flash??????????????20????AT24Cxx??е?EEPROM?????????????100?????????????????????????100?????????????EEPROM??FLASH????????????????????????????????????????Flash?????????????????
??????????????????SPI Flash????EEPROM???????????????????W25Q16?????????Flash?????????·??????????????
W25Qxx??У?W25Q80, W25Q16 andW25Q32????Flash????????Page??Sector??Block??????????????Page?256??Byte?????Sector?16??Page?????4KB?????Block?16??Sector?????64KB??
?????????????????????д??????????????????????????????????????????W25Qxx??е?Flash??SPI????????????
1????????????
2??SPIд??????
3??SPI??/д????
4????????????
5???????????
?????????????Sector???λ???????Block???λ??????Sector???????????0x20?????????????24λ??洢?????д???24λ???????????12λ????????????????????????????????Block??64KB?????????????0xD8????????????24λ??????о?????????????16λ????????????о??????????????0xFF??????Flash?????????????????????????????????????????Flash?洢??????????д??λ1??????д??λ0???????д????????????????????????????0xFF???д??????????????bit 1???????????????bit 0?д??0???ɡ?????????Flash????д??????????в????????????W25Q16?????????????????????????Sector???????д?????????????д??????д????????????д????????0????????е???λ??1???????????д???1??????????????ж??λ??0??????????????Flash??????????????????????????????0xFF?????????????????д???κ?????????????????д???κ??????
????д????????????Page??д???????????д256???????????????????д????????????????????д????????д?????????????????????????????????????????????????????????????????????10.2.14????????????д?????????0x02??β??24λ??????
????????????????о???ID???W25Qxx???Flash?ж??ID???Manufacturer ID??Device ID??Unique ID??JEDEC ID??W25Q16???????Manufacturer ID?0xEF??Device ID?0x14??Unique ID?????????JEDEC ID??????......????????Unique ID????????????????ID?????????????????????????????STM32???Ψ????ID??д??FLASH?????????????????
???????????4???????????????????SPI Flash???????????????????????ò????
????simon ?????????2019-09-04
