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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.
•
FTFE_XACCn field descriptions
Field
Description
XA
Execute-only access control
0
Associated segment is accessible in execute mode only (as an instruction fetch)
1
Associated segment is accessible as data or in execute mode
16.4.4.10 Supervisor-only Access Registers (FTFE_SACCn)
The SACC registers define which program flash segments are restricted to supervisor
only or user and supervisor access.
The eight SACC registers allow up to 64 restricted segments of equal memory size.
Supervisor-only access register
Program flash supervisor-only access bits
SACCH0
SA[63:56]
SACCH1
SA[55:48]
Table continues on the next page...
Memory map and registers
Kinetis KE1xZ256 Sub-Family Reference Manual, Rev. 3, 07/2018
306
NXP Semiconductors
Summary of Contents for Kinetis KE1xZ256
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