The usual way is to connect the LSB bits to the available LSB, i.e. connect panel's R0+R1+R2+R3 to controller's (mcu's) R0 (observing pin loading), R4 to R1, R5 to R2, R6 to R3 and R7 to R4; other colors similarly.
The usual way is to connect the LSB bits to the available LSB, i.e. connect panel's R0+R1+R2+R3 to controller's (mcu's) R0 (observing pin loading), R4 to R1, R5 to R2, R6 to R3 and R7 to R4; other colors similarly.