Embedded Flash memory interface RM0401
46/771 RM0401 Rev 3
3.3 Embedded Flash memory
The Flash memory has the following main features:
• Capacity up to 128 Kbytes
• 128 bits wide data read
• Byte, half-word, word and double word write
• Sector and mass erase
• Memory organization
The Flash memory is organized as follows:
– A main memory block divided into 4 sectors of 16 Kbytes plus 1 sector of
64 Kbytes.
– System memory from which the device boots in System memory boot mode
– 512 OTP (one-time programmable) bytes for user data
The OTP area contains 16 additional bytes used to lock the corresponding OTP
data block.
– Option bytes to configure read and write protection, BOR level, watchdog
software/hardware and reset when the device is in Standby or Stop mode.
• Low-power modes (for details refer to the Power control (PWR) section of the reference
manual)
Table 5. Flash module organization
Block Name Block base addresses Size
Main memory
Sector 0 0x0800 0000 - 0x0800 3FFF 16 Kbytes
Sector 1 0x0800 4000 - 0x0800 7FFF 16 Kbytes
Sector 2 0x0800 8000 - 0x0800 BFFF 16 Kbytes
Sector 3 0x0800 C000 - 0x0800 FFFF 16 Kbytes
Sector 4 0x0801 1000 - 0x0801 FFFF 64 Kbytes
System memory 0x1FFF 0000 - 0x1FFF 77FF 30 Kbytes
OTP area 0x1FFF 7800 - 0x1FFF 7A0F 528 bytes
Option bytes 0x1FFF C000 - 0x1FFF C00F 16 bytes
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