Freescale Semiconductor MK22FN256VDC12, Reference Manual

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Execute-only access register Program Flash IFR address A Program Flash IFR address B
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.
Address: 4002_0000h base + 18h (1d × i), where i=0d to 7d
Bit 7 6 5 4 3 2 1 0
Read XA
Write
Reset x* x* x* x* x* x* x* x*
* Notes:
x = Undefined at reset. •
FTFA_XACCn field descriptions
Field Description
7–0
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
29.33.8 Supervisor-only Access Registers (FTFA_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]
SACCH2 SA[47:40]
SACCH3 SA[39:32]
SACCL0 SA[31:24]
SACCL1 SA[23:16]
SACCL2 SA[15:8]
SACCL3 SA[7:0]
During the reset sequence, the SACC registers are loaded with the logical AND of
Program Flash IFR addresses A and B as indicated in the following table.
Chapter 29 Flash Memory Module (FTFA)
K22F Sub-Family Reference Manual , Rev. 3, 7/2014
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