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DCAN Control Registers
1481
SPNU563A–March 2018
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Controller Area Network (DCAN) Module
27.17.24 IF1/IF2 Mask Registers (DCAN IF1MSK, DCAN IF2MSK)
The bits of the IF1/IF2 Mask Registers mirror the mask bits of a message object. The function of the
relevant message objects bits is described in Section 27.5.1.
NOTE: While Busy bit of IF1/IF2 Command Register is one, IF1/IF2 Register Set is write protected.
Figure 27-59. IF1 Mask Register (DCAN IF1MSK) [offset = 104h]
31 30 29 28 16
MXtd MDir Rsvd Msk[28:16]
R/WP-1 R/WP-1 R-1 R/WP-1FFFh
15 0
Msk[15:0]
R/WP-FFFFh
LEGEND: R/W = Read/Write; R = Read; WP = Protected Write (protected by Busy bit); -n = value after reset
Figure 27-60. IF2 Mask Register (DCAN IF2MSK) [offset = 124h]
31 30 29 28 16
MXtd MDir Rsvd Msk[28:16]
R/WP-1 R/WP-1 R-1 R/WP-1FFFh
15 0
Msk[15:0]
R/WP-FFFFh
LEGEND: R/W = Read/Write; R = Read; WP = Protected Write (protected by Busy bit); -n = value after reset
Table 27-26. IF1/IF2 Mask Register Field Descriptions
Bit Field Value Description
31 MXtd Mask extended identifier.
0 The extended identifier bit (IDE) has no effect on the acceptance filtering.
1 The extended identifier bit (IDE) is used for acceptance filtering.
When 11-bit ("standard") identifiers are used for a message object, the identifiers of received Data
Frames are written into bits ID[28:18]. For acceptance filtering, only these bits with mask bits
Msk[28:18] are considered.
30 MDir Mask message direction.
0 The message direction bit (Dir) has no effect on the acceptance filtering.
1 The message direction bit (Dir) is used for acceptance filtering.
29 Reserved 0 These bits are always read as 1. Writes have no effect.
28-0 Msk[n] Identifier mask.
0 The corresponding bit in the identifier of the message object is not used for acceptance filtering
(don't care).
1 The corresponding bit in the identifier of the message object is used for acceptance filtering.
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