68300

Sudha,

I think you are confused about interrupts and program control.  The SIM is 
one of many participants in the IACK cycle that the CPU32 initiates upon 
recognition of an interrupt.  For external interrupts and PIT interrupts, 
the SIM module responds to the IACK cycle so that the CPU32 can decide how 
to respond to the interrupt.  (Program flow never transfers to the SIM.)

The QSPI is separate and independent from the SIM.  The SIM's 
participation in an IACK cycle does not affect the QSPI.  The CPU32 
executing an ISR does not affect the QSPI.  Therefore, SCK continues 
normally upon an interrupt and during interrupt processing.  As long as 
you configure the QSPI as master, only your code can stop a QSPI 
transaction in the middle.  That characteristic is one of many that make 
the QSPI great.

Jeff





"sudha srinivasan" <sudha_sri@...>
09/01/2003 04:29 AM
Please respond to 68300

 
        To:     <68300@yahoogroups.com>
        cc: 
        Subject:        [68300] M68332


Dear all,
Please help me with the following info :

If QSPI is enabled and if an external interrupt or a timer interrupt 
occurs,
the program control is transferred to the SIM module.

In this context, will the QSPI operation be resumed ,after servicing the
ISR.(Please note that the QSPI is not in interrupt mode).
Will the SCK from QSPI to the serial device ,stop as soon as the interrupt
is encountered?



Thanks
Sudha



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