Canon XH A1S Instruction Manual page 45

In SD mode with the frame rate set to 24F, the frames value of the time code can be set only in
multiples of 5. When you change the frame rate from 60i/30F to 24F, the frames value of the time
code will automatically become a multiple of 5.
When you mix drop frame and non-drop frame time codes (including 24F frame rate in SD mode),
there might be a discontinuity in the time code at the point where the recording starts.
When recording over existing scenes: When a time code discontinuity occurred near the recording
start point, the time code at the point where the recording starts may be discontinuous as well.
As long as the built-in rechargeable lithium battery is charged, the free-run time code continues to
run even if you disconnect all other power sources.
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