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3.8.10.2 Arming Function: Count Mode
In count mode, the arming function compares each offset cancelled sample against positive and negative thresholds that are
programmed via the ARMT_x registers. Reference Section 3.1.10 for register details. If the sample equals or exceeds either
threshold, a sample counter is incremented. If the sample does not exceed either threshold, the sample counter is reset to zero.
The sample rate is determined by the SPI acceleration data sample rate. At the rising edge of CS for an acceleration data SPI
request, a new sample is compared against the thresholds. Reference Figure 28 . The SPI acceleration data sample rate must
meet the minimum time between requests (t ACC_REQ_x ) specified in Section 2.5 .
A sample count limit is programmable via the AWS_x[1:0] bits in the ARMCFG register. If the sample count reaches the pro-
grammable sample count limit, an arming condition is indicated, the ARM output is asserted for the associated axis, and the pulse
stretch counter is set as described in Section 3.8.10.4 .
The ARM output is de-asserted only when the pulse stretch counter expires. Figure 28 shows the arming output operation for
different SPI conditions.
AWS_P[1:0]
ARMT_P[7:0]
Offset Cancellation
1-4 Sample
OffCanc_ARM[10:0]
Counter
Pulse Stretch
Gating
I/O
ARM
ARMT_N[7:0]
APS[1:0]
Figure 27. Arming Function Block Diagram - Count Mode
SCLK
CS
MOSI
Request X-Axis
X-Axis Response
Request X-Axis
X-Axis Response
Request X-Axis
X-Axis Response
Request X-Axis
X-Axis Response
MISO
ARM
X-Axis Arm Condition
Not Present
X-Axis Arm Condition
Present
X-Axis Arm Condition
Not Present
X-Axis Arm Condition
Not Present
Data
Latched for
Arm & SPI
t ARM
Pulse Stretch Time
Figure 28. Arming Condition, Moving Average and Count Mode
MMA655x
Sensor
Freescale Semiconductor, Inc.
37
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