Cut and paste this URL to share the unmodified register and value:
https://regviz.com/r/stm32/stm32f7/STM32F767/JPEG/JPEG_CONFR6#0x0
JPEG codec configuration register 6
Huffman DC
Huffman AC
Quantization Table
Number of Block
Vertical Sampling Factor
Horizontal Sampling Factor
https://github.com/modm-io/cmsis-svd-stm32