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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
individually programmed for each axis via the ARMT_Xx and ARMT_Yx 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 thresh-
old, the sample counter is reset to zero.
The sample rate for each axis is determined by the SPI acceleration data sample rate. At the rising edge of CS for an accel-
eration data SPI request, a new sample for the associated axis 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 2.6 .
A sample count limit is programmable via the AWS_Xx[1:0] and AWS_Yx[1:0] bits in the ARMCFGX and ARMCFGY registers.
If the sample count reaches the programmable sample count limit, an arming condition is indicated, the ARM_X or ARM_Y output
is asserted for the associated axis, and the pulse stretch counter is set as described in Section 3.8.10.4 .
The ARM_X or ARM_Y output is de-asserted only when the pulse stretch counter expires. Figure 28 shows the arming output
operation for different SPI conditions.
AWS_xP[1:0]
ARMT_xP[7:0]
Offset Cancellation
1-4 Sample
OffCanc_ARM_x[10:0]
Counter
Pulse Stretch
Gating
I/O
ARM_x
ARMT_xN[7:0]
APS_x[1:0]
Figure 27. Arming Function Block Diagram - Count Mode
SCLK
CS
MOSI
Request X-Axis
Y-Axis Response
Request Y-Axis
X-Axis Response
Request X-Axis
Y-Axis Response
Request Y-Axis
X-Axis Response
MISO
ARM_X
ARM_Y
Y-Axis Arm Condition
Not Present
X-Axis Data
Latched for
Arm & SPI
t ARM
X-Axis Arm Condition
Present
Y-Axis Data
Latched for
Arm & SPI
Y-Axis Arm Condition
Present
X-Axis Data
Latched for
Arm & SPI
X-Axis Arm Condition
Not Present
Y-Axis Pulse Stretch
X-Axis Pulse Stretch
Figure 28. X and Y Axis Arming Conditions, Moving Average and Count Mode
MMA65xx
Sensor
38
Freescale Semiconductor, Inc.
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