Canon XL H1A Instruction Manual page 59

In 24F (in SD) mode, the "frames" value of the time code is set 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),
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the time code at the point where the recording starts may be discontinuous.
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 long as the built-in rechargeable lithium battery is charged, the free-run time code continues to
run even if you disconnect the battery pack.
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