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BQ76930: I can set ADC_EN adn TEMP_SEL, but not CC_Oneshot.

Part Number: BQ76930

During the configuration of my BQ76930 I make a write to register SYS_CTRL1 of 0x18, and a write to SYS_CTRL2 of 0x20.

When I subsequently read them back, I see 0x18 and 0x00 respectively. It seems as if the "ADC_EN" and "TEMP_SEL" bits have been set, but the "CC_Oneshot" isn't.

These writes are part of an initialisation routine from power-up, and both flags CC_EN and CC_READY are 0. 

Here is the I2C:

What am I doing wrong? Any help at all would be appreciated.