In SX Microcontrollers, SX/B Compiler and SX-Key Tool, Beau Schwabe wrote:

All,

You must be in One-Shot mode when reading the High Resolution temperatures.  The reason is that there is more than one
register that you need to read from in order to determine a temperature in high resolution mode.  If you are free running, then
there is a likely chance that the register can be overwritten before you have had a chance to read all of the necessary register
values.  In that case, the temperature reading will not be accurate.

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