(a) A trial following a mistrial must commence not later than the 90th day after the date a mistrial was declared in the previous trial, unless the later trial is continued as provided by Section 841.063.
(b) If an appellate court remands the case to the trial court for a new trial, the judge shall commence the retrial not later than the 90th day after the date the appellate court remanded the case. The retrial may be continued as provided by Section 841.063.