Freescale Semiconductor MPC5553 - Page 1001

MPC5553/MPC5554 Microcontroller Reference Manual, Rev. 5
22-16 Freescale Semiconductor
22.3.3.4.1 RX Global Mask (CANx_RXGMASK)
The RX global mask bits are applied to all RX identifiers excluding RX buffers 14–15, that have their
specific RX mask registers. Access to this register is unrestricted. Note that CANx_RXGMASK is
unaffected by soft reset (which occurs when CAN_MCR[SOFTRST] is asserted).
RX Msg in
6
1 0 1 1 1 1 1 1 0 0 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1
RX Msg in
7
0 1 1 1 1 1 1 1 0 0 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 14
1
Match for Extended Format (MB3).
2
Match for Standard Format. (MB2).
3
Mismatch for MB3 because of ID0.
4
Mismatch for MB2 because of ID28.
5
Mismatch for MB3 because of ID28, Match for MB14 (uses RX14MASK).
6
Mismatch for MB14 because of ID27 (uses RX14MASK).
7
Match for MB14 (uses RX14MASK).
0123456789101112131415
R 0 0 0 MI28 MI27 MI26 MI25 MI24 MI23 MI22 MI21 MI20 MI19 MI18 MI17 MI16
W
Reset
1
0001111111111111
Reg Addr Base + 0x0010 (CANx_RXGMASK), Base + 0x0014 (CANx_RX14MASK), Base + 0x0018 (CANx_RX15MASK)
16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31
R MI15 MI14 MI13 MI12 MI11 MI10 MI9 MI8 MI7 MI6 MI5 MI4 MI3 MI2 MI1 MI0
W
Reset
1
1111111111111111
Reg Addr Base + 0x0010 (CANx_RXGMASK), Base + 0x0014 (CANx_RX14MASK), Base + 0x0018 (CANx_RX15MASK)
1
CANx_RXGMASK is unaffected by soft reset (which occurs when CAN_MCR[SOFTRST] is asserted).
Figure 22-6. RX Global Mask Register (CANx_RXGMASK)
Table 22-10. CANx_RXGMASK Field Descriptions
Bits Names Description
0–2 — Reserved, should be cleared.
3–13 MIn Standard ID mask bits. These bits are the same mask bits for the standard and extended
formats.
14–31 MIn Extended ID mask bits. These bits are used to mask comparison only in extended format.
Table 22-9. Mask Examples for Standard/Extended Message Buffers (Continued)
Base ID
ID28.................ID18
IDE
Extended ID
ID17......................................ID0
Match