Wrong Flash Size on STM32F103C8T6

[christophkeiner9]

Posted on July 05, 2018 at 16:37

I'm just confused by a Board called Blue-Pill in the Community. It has a STM32F103C8T6 installed, but the Flash-Size Readout is 0x20000 and not 0x10000 for 64k as expected. It is also possible to use this Flash.

Here is the complete marking:

STM32

F103C8T6

GH21N 93

CHN 801

Revision Code: X

[Tesla DeLorean]

Posted on July 05, 2018 at 16:44

ST has been known to use different F1 die depending on availability. You should perhaps read the DEV_ID and the 16-bit word describing the size of the FLASH tested during final test and recorded in the ROM/OTP space.

There are several F1 die with different FLASH, RAM and peripheral combinations. Lower cost parts being a subset of higher functioning parts.