Divider result quotient
The result of DIVIDEND / DIVISOR (division). Contents undefined while CSR_READY is low.
For signed calculations, QUOTIENT is negative when the signs of DIVIDEND and DIVISOR differ.
This register can be written to directly, for context save/restore purposes. This halts any
in-progress calculation and sets the CSR_READY and CSR_DIRTY flags.
Reading from QUOTIENT clears the CSR_DIRTY flag, so should read results in the order
REMAINDER, QUOTIENT if CSR_DIRTY is used.