SIZE register
| FLASH_SIZE | Maximum valid address for flash memory: 
 | 
| RAM_SIZE | RAM memory size selection: 
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| FLASH_SECURE | Flash memory protection (0: no key present, 1: key present) | 
| SWD_DISABLE | Flash+SWD protection: 0: No SWD protection (refer to FLASH_SECURE) 1: Flash and SWD protected |