Cut and paste this URL to share the unmodified register and value:
https://regviz.com/r/stm32/stm32n6/STM32N645/JPEG/JPEG_HUFFENC_AC1_9#0x0
JPEG Huffman encoder AC1
Huffman code 18
Huffman length 18
Huffman code 19
Huffman length 19
https://github.com/modm-io/cmsis-svd-stm32