SH7709_PGDR
reg = _reg_read_1(SH7709_PGDR);
pgdr = _reg_read_1(SH7709_PGDR);
return _reg_read_1(SH7709_PGDR) & PGDR_MAIN_BATTERY_OUT;
data = _reg_read_1(SH7709_PGDR) | (_reg_read_1(SH7709_PHDR) << 8);