Cut and paste this URL to share the unmodified register and value:
https://regviz.com/r/stm32/stm32h7rs/STM32H7R/JPEG/JPEG_HUFFSYMB69#0x0
JPEG Huffman symbol
Data 276 Huffman symbol.
Data 277 Huffman symbol.
Data 278 Huffman symbol.
Data 279 Huffman symbol.
https://github.com/modm-io/cmsis-svd-stm32