SIZE register
| FLASH_SIZE | Maximum valid address for flash memory: 
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| RAM_SIZE | RAM memory size selection: 
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| FLASH_SECURE | Flash memory protection (0: no key present, 1: key present) | 
| JTAG_DISABLE | Flash+JTAG protection (0: no JTAG protection - see FLASH_SECURE, 1: Flash and JTAG protected) | 
| PACKAGE_SIZE | Package selection: 
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