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Slave Port Interface
8.7
Interrupts
The slave port module can generate three different interrupts to the CPU:
? An interrupt to notify the CPU that the system master has updated information in the mailbox
registers
? Semaphore Time-out 1
? Semaphore Time-out 2
The slave port can also generate an interrupt to the host controller via the SP_OIC register.
8.7.1
Mailbox interrupt
The SP_SCR[WIE] register bit can be used to enable/disable the mailbox interrupt. SP_SCR[WWUP] can
be used to configure specific operation of the mailbox interrupt.
WWUP = 00 is the default operation. In this case, assertion of interrupts is possible only in RUN mode. If
the system master were to write to the mailbox registers during STOP, no action would be taken until STOP
mode was exited. At that point (assuming WIE=1), the interrupt would be issued and the CPU would
process the new data. This mode of operation will yield the most accurate results from the on-chip data
converters, at the price of additional latency (determined by the sample frame rate) in handling of any new
command/data from the system master.
WWUP = 01 includes the operation above. In addition, SP_MB31 now takes on a special role as a
“wake-up register.” A write by the master to this register will force the CPU into RUN mode if it is not
already there. This minimizes latency, at the possible cost of decreased accuracy on the affected set of data
conversions.
WWUP = 10 takes the “wake-up register” concept to the extreme. Any write to any of the mailbox registers
will result in an immediate wake-up interrupt assertion.
8.7.2
Semaphore interrupts
Each of the two semaphores has its own time-out control register and time-out interrupt. The semaphore
timers are intended to limit semaphore lockouts to one frame in length or less. Longer periods should be
enforced via software in the start of frame interrupt service routine.
8.8
Reset operation
This module is reset along with the rest of the chip. I 2 C and SPI communications are not possible during
reset (specifically sim_chip_resetb) assertion.
MMA955xL Intelligent, Motion-Sensing Platform Hardware Reference Manual, Rev. 1.0
152
Freescale Semiconductor, Inc.
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