17.4.4.9 Execute-only Access Registers (FTFE_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
0x03A3
0x03AB
XACCH1
0x03A2
0x03AA
XACCH2
0x03A1
0x03A9
XACCH3
0x03A0
0x03A8
XACCL0
0x03A7
0x03AF
XACCL1
0x03A6
0x03AE
XACCL2
0x03A5
0x03AD
XACCL3
0x03A4
0x03AC
Use the Program Once command to program the execute-only access control fields that
are loaded during the reset sequence.
Address: 4002_0000h base + 18h (1d × i), where i=0d to 7d
Bit
7
6
5
4
3
2
1
0
Read
Write
Reset
* Notes:
x = Undefined at reset.
•
Memory map and registers
Kinetis KE1xF Sub-Family Reference Manual, Rev. 4, 06/2019
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NXP Semiconductors
Содержание KE1xF Series
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