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CC2530 OTA升级读写 SPI Flash数据异常

Other Parts Discussed in Thread: CC2530

CC2530 OTA升级读写 SPI Flash,型号是 ST M25PE20,读取到的数据都是0。后面在数据输入端芯片引脚增加上拉电阻,才可以读取正常。

请问一下这个是什么问题?数据口是否必须上拉?有什么改善方法?

盼回复,谢谢……