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ADS1298R与msp430F6638的连接问题

Other Parts Discussed in Thread: MSP430F6638, ADS1298R, ADS1298

我用msp430F6638来控制ADS1298R,1298R的sclk、din和dou等t直接连接到430相应SPI的管脚。 我在观察430的spi输出数据时发现,逻辑正确,但是高电平被拉到1V左右。而不与1298R连接的430的io管脚输出的高电平为3.3V左右(430的电源为3.3V),请问为什么1298R会拉低单片机的输出电平?   我想在这两个芯片连接的管脚加上拉是否可行