4.1
SPI Command Format
Commands are transferred from the SPI master to MMA68xx. Valid commands fall into two categories: register operations,
and acceleration data requests.
Table 29. SPI Command Message Summary
MSB
LSB
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
0
AX
A
OC
0
0
0
0
0
0
0
0
0
SD
AR
M
P
Command Type
Reference
AX= Axis Selection
0
1
X-Axis Acceleration Data
Y-Axis Acceleration Data
A = Acceleration Data Request
0
1
Register Operation
Acceleration Data
Request
OC = Offset Cancelled Data Request
0
1
Offset Cancelled Data Request
Raw Acceleration Data Request
SD = Signed Data Confirmation
Signed Data Enabled
Unsigned Data Enabled
0
1
ARM = ARM Function Status Confirmation
Disabled / PCM Output Enabled
Arming Function Enabled
0
1
P = Odd Parity
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
AX
0
0
0
0
0
0
0
0
1
1
1
1
1
1
1
1
A
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
OC
0
0
0
0
1
1
1
1
0
0
0
0
1
1
1
1
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
SD
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
AR
M
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
P
0
1
1
0
1
0
0
1
1
0
0
1
0
1
1
0
Accel Data
X-Axis OC, Signed Data, Disabled/PCM
X-Axis OC, Signed Data, ARM Enabled
X-Axis OC, Unsigned Data, Disabled/PCM
X-Axis OC, Unsigned Data, ARM Enabled
X-Axis Raw, Signed Data, Disabled/PCM
X-Axis Raw, Signed Data, ARM Enabled
X-Axis Raw, Unsigned Data, Disabled/
PCM
X-Axis Raw, Unsigned Data, ARM Enabled
Y-Axis OC, Signed Data, Disabled/PCM
Y-Axis OC, Signed Data, ARM Enabled
Y-Axis OC, Unsigned Data, Disabled/PCM
Y-Axis OC, Unsigned Data, ARM Enabled
Y-Axis Raw, Signed Data, Disabled/PCM
Y-Axis Raw, Signed Data, ARM Enabled
Y-Axis Raw, Unsigned Data, Disabled/
PCM
Y-Axis Raw, Unsigned Data, ARM Enabled
P
AX
A
D12
D11
D10
D9
D8
D7
D6
D5
D4
D3
D2
D1
D0
Command Type
Reference
A4
A3
A2
A1
A0
P
0
0
0
0
0
0
0
0
0
0
Register Read
Section 4.4
Register Address
A4
A3
A2
A1
A0
D7
D6
D5
D4
D3
D2
D1
D0
P
1
0
Register Write
Section 4.4
Register Address
Data to be Written to Register
P = Odd Parity
MMA68xx
Sensors
Freescale Semiconductor, Inc.
45
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