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

If you want times that long, you will need to use a much coarser resolution for the interrupt, or get into 32 bit counters (two words). At 10us, a max counter value of $FFFF would only be .655 seconds -- pretty long for an RC circuit but not long enough for your purposes. You may want to try dropping the whole thing with a divider to slow down the RC counter, e.g.

INC rcDivider
IF rcDivider >= 100 THEN
   rcDivider = 0
   INC rcCounter
ENDIF

That would effecticly scale the count up by 100, so you'd have a max time count of around 65.5 seconds.

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