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6
SPI Diagnostic and Programming Mode
SPI Diagnostic and Programming Mode allows for the following functions:
? Programming of the OTP array
? Reading of memory registers
SPI transfers follow CPOL = 0, CPHA = 0, MSB first convention. Figure 7 shows the SPI transfer timing, and Figure 45 shows
the SPI transfer protocol.
BIT
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
SCLK
CS
D IN
D OUT
D15
D15
D14
D14
D13
D13
D12
D12
D11
D11
D10
D10
D9
D9
D8
D8
D7
D7
D6
D6
D5
D5
D4
D4
D3
D3
D2
D2
D1
D1
D0
D0
Figure 45. SPI Transfer Protocol
The following operations are supported in DPM:
? Register pointer write
? Register pointer read
? Register data write
? Register data read
? Acceleration data read
6.1
6.1.1
Communication Error Detection
Data Input Parity Detection
All commands except for the DPM Entry command employ odd parity to ensure data integrity. For Read commands, the parity
bit is located in bit D10, and the parity is calculated using bits D15 through D11. For Write commands, the parity bit is located in
bit D9, and the parity is calculated using bits D15 through D0. If a parity error is detected, both the current and subsequent com-
mands are ignored, and the parity fault response is transmitted during the subsequent SPI transfer.
6.1.2
Data Output Parity
All responses except for the DPM entry response employ odd parity to ensure data integrity. Parity is calculated using the entire
16-bit message.
6.2
DPM Entry
DPM can be activated at any time during the operation of the device, provided the SPI DPM Entry command is the first com-
mand transmitted. If an incorrect DPM Entry command is received, DPM is locked out, and cannot be activated until the device
is reset.
The device responds to the DPM Entry command with the logical complement of the received data as confirmation that it has
been received correctly. Upon completion of a successful transfer DPM is activated. Once activated, the device will remain in
DPM until a reset condition occurs.
Following successful transmission of the DPM Entry command, DPM operations may be completed in any order.
MMA52xxKW
Sensors
54
Freescale Semiconductor, Inc.
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