CG_AT__CG_L__SHIFT
reg = 0xffff << CG_AT__CG_R__SHIFT | 0 << CG_AT__CG_L__SHIFT;
a_t = 0xffff << CG_AT__CG_R__SHIFT | 0 << CG_AT__CG_L__SHIFT;
a_t = (0xffff) << CG_AT__CG_R__SHIFT | (t_h * high_bsp / 20000) << CG_AT__CG_L__SHIFT;