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Cortex-M3 Processor Registers
2.7.2.19 MASK3 Register (Offset = 54h) [reset = X]
MASK3 is shown in
and described in
Mask 3 Use the DWT Mask Registers 3 to apply a mask to data addresses when matching against
COMP3.
COMP3.
Figure 2-59. MASK3 Register
31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 16 15 14 13 12 11 10
9
8
7
6
5
4
3
2
1
0
RESERVED
MASK
R/W-X
R/W-0h
Table 2-83. MASK3 Register Field Descriptions
Bit
Field
Type
Reset
Description
31-4
RESERVED
R/W
X
Software should not rely on the value of a reserved. Writing any
other value than the reset value may result in undefined behavior.
other value than the reset value may result in undefined behavior.
3-0
MASK
R/W
0h
Mask on data address when matching against COMP3. This is the
size of the ignore mask. That is, DWT matching is performed
as:(ADDR ANDed with (0xFFFF left bit-shifted by MASK)) ==
COMP3. However, the actual comparison is slightly more complex to
enable matching an address wherever it appears on a bus. So, if
COMP3 is 3, this matches a word access of 0, because 3 would be
within the word.
size of the ignore mask. That is, DWT matching is performed
as:(ADDR ANDed with (0xFFFF left bit-shifted by MASK)) ==
COMP3. However, the actual comparison is slightly more complex to
enable matching an address wherever it appears on a bus. So, if
COMP3 is 3, this matches a word access of 0, because 3 would be
within the word.
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SWCU117A – February 2015 – Revised March 2015
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