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ADuC841 alternate SPI pins

Is just setting CFG841.1 (MSPI) enough to use the alternate SPI pins ?  The datasheet is a bit unclear about this, it reads like the I2C needs to be enabled (and correctly set up ?) of that to work too ?  I'm trying to use SPI at P3.3-P3.5 without any use of I2C currently.

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