39.6.9.3 Vertical Scaler

The YMEMSIZE field of the LCDC_HEOCFG4 register indicates the vertical size minus one of the image in the system memory. The YSIZE field of the LCDC_HEOCFG3 register contains the vertical size minus one of the window. The SCALEN bit of the LCDC_HEOCFG13 register is set to one. The scaling factor is programmed in the YFACTOR field of the LCDC_HEOCFG13 register.

YFACTO R_{1 st} = floor (\frac{8 \times 256 \times YMEMSIZE - 256 \times YPHIDEF}{YSIZE})

YFACTO R_{1 st} = YFACTO R_{1 st} + 1

YME {MSIZE}_{\max} = floor (\frac{YFACTO R_{1 st} \times YSIZE + 256 \times YPHIDEF}{2048})

\{\begin{matrix} YFACTOR = YFACTO R_{1 st} - 1 when (YME {MSIZE}_{\max} > YMEMSIZE) \\ YFACTOR = YFACTO R_{1 st} otherwise \end{matrix}