This function must return the elapsed time in microseconds
since the simulation model reset.
The read_clock entry in the ARMul_MemInterface structure
is a pointer to an armul_ReadClock() function.
ARMTime armul_ReadClock(void *handle)
where:
handleis the value of interf->handle set
in MemInit.
This function returns an ARMTime value
representing the elapsed time in microseconds. The default type
of ARMTime is unsigned long. ARMTime is
defined in armul_types.h.
A model can supply NULL if it does not
support this functionality.
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