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Operational Phases and Modes of Operation
4.3.2
Additional timing parameters
Additional terms that occasionally factor into the discussions include:
F osc-high
F osc-low
P osc-high
P osc-low
4.3.3
The high-speed frequency of the on-chip oscillator. This is nominally 8 MHz.
The low-speed frequency of the on-chip oscillator. This is nominally F osc-high /128.
The length of time required for one cycle of the oscillator clock in high-speed
mode (= 1/F osc-high ).
The length of time required for one cycle of the oscillator clock in low-speed mode
(= 1/F osc-low = 128/F osc-high ).
Phase triggers
Figure 11-1 on page 190 illustrates some of the major interactions between modules in this device:
? The “start-of-frame” signal is generated by the frame interval counter.
? SIM hardware is responsible for generating phase triggers for ? A and ? D .
? The “End ? A ” signal is generated by the AFE.
? In sample frames, “Start ? A ” results from the start-of-frame from the CLKGEN module. In this
case, “Start ? D ” results from the “End ? A ” signal.
? For non-sample frames, the “start-of-frame” results in “start ? D ”.
? “ ? A started” and “ ? D started” signals (not shown) can be slightly delayed from “start ? A ” and
“start ? D ”. In the event that the system clock is switching from off (or low speed) to high speed,
these signals are not asserted until the oscillator actually switches. The difference in the two sets
of triggers is any latency associated with interrupt assertion and/or CLKGEN-mode switching.
Figure 4-4 illustrates sequencing of the “Start ? A “and “Start ? ” hardware triggers. Figure 4-5 on page 39
shows that a STOP instruction (with STOPCR[SC] = 1) is required to transition into the idle phase. (See
the SIM register map.)
First sample frame
Second sample frame
Third sample frame
? A
Start ? A
Start ? D
? D
? I
Start ? A
? A
Start ? D
? D
? I
Start ? A
? A
Start ? D
? D
Figure 4-4. Phase triggers required in hardware
MMA955xL Intelligent, Motion-Sensing Platform Hardware Reference Manual, Rev. 1.0
38
Freescale Semiconductor, Inc.
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