16.5.11.10 Read Once Command
The Read Once command provides read access to a reserved 96-byte field located in the
program flash IFR (see
). Access to the
Program Once field is via 12 records, each 8 bytes long. The Program Once field is
programmed using the Program Once command described in
Table 16-30. Read Once Command FCCOB Requirements
FCCOB Number
FCCOB Contents [7:0]
0
0x41 (RDONCE)
1
Program Once record index (0x00 - 0x0B)
Returned Values
4
Program Once byte 0 value
5
Program Once byte 1 value
6
Program Once byte 2 value
7
Program Once byte 3 value
8
Program Once byte 4 value
9
Program Once byte 5 value
A
Program Once byte 6 value
B
Program Once byte 7 value
After clearing CCIF to launch the Read Once command, an 8-byte Program Once record
is read from the program flash IFR and stored in the FCCOB register. The CCIF flag is
set after the Read Once operation completes. Valid record index values for the Read
Once command range from 0x00 to 0x0B. During execution of the Read Once command,
any attempt to read addresses within the program flash block containing this 96-byte field
returns invalid data. The Read Once command can be executed any number of times.
Table 16-31. Read Once Command Error Handling
Error Condition
Error Bit
Command not available in current mode/security
FSTAT[ACCERR]
An invalid record index is supplied
FSTAT[ACCERR]
16.5.11.11 Program Once command
The Program Once command enables programming to a reserved 96-byte field in the
program flash IFR (see
). Access to the
Program Once field is via 12 records, each 8 bytes long. The Program Once field can be
Chapter 16 Flash Memory Module (FTFE)
Kinetis KE1xZ256 Sub-Family Reference Manual, Rev. 3, 07/2018
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