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7.5.9
CI_PROTECT and CI_UNPROTECT
These complementary functions are used for toggling the state of the FOPT[PROTB] control bit. Flash
programing/erase checks the status of this bit prior to undertaking any changes to the flash array. If
FOPT[PROTB] = 0, the device is considered in a “protected” state and (except for BDM-initiated
mass-erase) the flash memory will not be modified. Any calls to CI_READ_WRITE or CI_ERASE to
modify the flash memory should be preceded by a call to CI_UNPROTECT and followed by a call to
CI_PROTECT.
7.5.9.1
CI_PROTECT command-packet format
The five-bit command code for the CI_PROTECT command is 0x07 The extension bits are 0.
Table 7-36. CI_PROTECT command-packet format at mailbox level
Mailbox #
0
1
Description
Command byte
Parameter byte
Bit 7
0
0
Bit 6
0
0
Bit 5
1
0
Bit 4
1
0
Bit 3
1
0
Bit 2
0
0
Bit 1
0
0
Bit 0
0
0
2-31
7.5.9.2
NOT USED
CI_UNPROTECT command-packet format
NOT USED
The five-bit command code for the CI_UNPROTECT command is 0x08. The extension bits are 0.
Table 7-37. CI_PROTECT Command Packet Format at Mailbox Level
Mailbox #
0
1
Description
Command byte
Parameter byte
Bit 7
0
0
Bit 6
1
0
Bit 5
0
0
Bit 4
0
0
Bit 3
0
0
Bit 2
0
0
Bit 1
0
0
Bit 0
0
0
2-31
NOT USED
NOT USED
7.5.9.3
CI_PROTECT and CI_UNPROTECT response-packets format
The first byte of the response packet contains the command packet previously sent.
The second byte is a general status byte. COCO is set to 1 when the command response is complete.
7.5.9.4
CI_PROTECT and CI_UNPROTECT access/security policies
Table 7-38. Access/Security Policies for CI Return Device Info Command
Security enabled
Available
Security disabled
Available
MMA955xL Intelligent, Motion-Sensing Platform Hardware Reference Manual, Rev. 1.0
Freescale Semiconductor, Inc.
99
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