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求助大虾!ADS7843E 设置MODE采集精度为8bit后获取到的数据最大值只能到数字113

ADS7843E 设置MODE采集精度为8bit后获取到的数据最大值只能到数字113,按ADS7843E提供是数据表格我将VREF设置为电源VCC,按正常情况按压4线电阻触摸屏最大值应该是能达到255但是读取ADS7843E始终是获取不到数值。请高手赐教谢谢!