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FTFA_FPROTn field descriptions (continued)
Field
Description
Each bit in the 32-bit protection register represents 1/32 of the total program flash except for memory
configurations with less than 64 KB of program flash where each assigned bit protects 2 KB .
0
Program flash region is protected.
1
Program flash region is not protected
24.3.4.7 Execute-only Access Registers (FTFA_XACCn)
The XACC registers define which program flash segments are restricted to data read or
execute only or both data and instruction fetches.
The eight XACC registers allow up to 64 restricted segments of equal memory size.
Execute-only access register
Program flash execute-only access bits
XACCH0
XA[63:56]
XACCH1
XA[55:48]
XACCH2
XA[47:40]
XACCH3
XA[39:32]
XACCL0
XA[31:24]
XACCL1
XA[23:16]
XACCL2
XA[15:8]
XACCL3
XA[7:0]
During the reset sequence, the XACC registers are loaded with the logical AND of
Program Flash IFR addresses A and B as indicated in the following table.
Execute-only access register
Program Flash IFR address A
Program Flash IFR address B
XACCH0
0xA3
0xAB
XACCH1
0xA2
0xAA
XACCH2
0xA1
0xA9
XACCH3
0xA0
0xA8
XACCL0
0xA7
0xAF
XACCL1
0xA6
0xAE
XACCL2
0xA5
0xAD
XACCL3
0xA4
0xAC
Use the Program Once command to program the execute-only access control fields that
are loaded during the reset sequence.
Chapter 24 Flash Memory Module (FTFA)
K32 L2A Reference Manual, Rev. 2, 01/2020
NXP Semiconductors
619
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