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I2C CC2650 byte order (specifically with MPU 9250)

Just a quick question (and possibly a stupid one) but in the data sheet for the MPU 9250 (as on the SensorTag), it says that the reset value to write to the PWR_MGMT_1 register is 0x01

However in the SensorTag firmware source code, the reset value written is 0x80 (which is exactly the reverse of the 0x01).

Say for example I am writing into the PWR_MGMT_1 register, and I want bit [7] to be 1 and [6:0] to be 0 - do I have to write basically the reverse of what I am thinking?