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3.1.8
Arming Configuration Registers (ARMCFG)
The arming configuration register contains configuration information for the arming function. The values in this register are only
relevant if the arming function is operating in moving average mode, or count mode.
This register can be written during initialization but is locked once the ENDINIT bit is set. Refer to Section 3.1.6.3 . This register
is included in the writable register CRC check. Refer to Section 3.2.2 for details.
Table 12. Arming Configuration Register
Location
Bit
Address
$0E
Register
ARMCFG
7
Reserved
6
Reserved
5
APS[1]
4
APS[0]
3
AWS_N[1]
2
AWS_N[0]
1
AWS_P[1]
0
AWS_P[0]
Reset Value
0
0
0
0
1
1
1
1
3.1.9
Reserved Bits (Reserved)
Bits 7 through 6 of the ARMCFG register are reserved. A write to the reserved bits must always be logic ‘0’ for normal device
operation and performance.
3.1.9.1 Arming Pulse Stretch (APS[1:0])
The APS[1:0] bit sets the programmable pulse stretch time for the arming outputs. Refer to Section 3.8.10 for more details
regarding the arming function. Pulse stretch times are derived from the internal oscillator, so the tolerance on this oscillator ap-
plies.
Table 13. Arming Pulse Stretch Definitions
APS[1]
0
0
1
1
APS[0]
0
1
0
1
Pulse Stretch Time (Typical Oscillator)
0 ms
16.256 ms - 16.384 ms
65.408 ms - 65.536 ms
261.888 ms - 262.016 ms
3.1.9.2 Arming Window Size (AWS_x[1:0])
The AWS_x[1:0] bits have different functions depending on the state of the A_CFG bits in the DEVCFG register. If the arming
function is set to moving average mode, the AWS bits set the number of acceleration samples used for the arming function mov-
ing average. The number of samples is set independently for each axis and polarity. If the arming function is set to count mode,
the AWS bits set the sample count limit for the arming function. The sample count limit is set independently for each axis. Refer
to Section 3.8.10 for more details regarding the arming function.
Table 14. Positive Arming Window Size Definitions (Moving Average Mode)
AWS_P[1]
0
0
1
1
AWS_P[0]
0
1
0
1
Positive Window Size
2
4
8
16
Table 15. Negative Arming Window Size Definitions (Moving Average Mode)
AWS_N[1]
0
0
1
1
AWS_N[0]
0
1
0
1
Negative Window Size
2
4
8
16
MMA655x
Sensor
Freescale Semiconductor, Inc.
17
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