Controller Area Network (FlexCAN)
MPC5510 Microcontroller Family Reference Manual, Rev. 1
Freescale Semiconductor
25-27
Preliminary
25.3.4.11 Rx Individual Mask Registers (CANx_RXIMR0
–
CANx_RXIMR63)
These registers are used as acceptance masks for ID filtering in Rx MBs and the FIFO. If the FIFO is not
enabled, one mask register is provided for each available message buffer, providing ID masking capability
Offset: Base + 0x0030
Access: User read/write
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
R BUF
31I
BUF
30I
BUF
29I
BUF
28I
BUF
27I
BUF
26I
BUF
25I
BUF
24I
BUF
23I
BUF
22I
BUF
21I
BUF
20I
BUF
19I
BUF
18I
BUF
17I
BUF
16I
W
Reset
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
R BUF
15I
BUF
14I
BUF
13I
BUF
12I
BUF
11I
BUF
10I
BUF
9I
BUF
8I
BUF
7I
BUF
6I
BUF
5I
BUF
4I
BUF
3I
BUF
2I
BUF
1I
BUF
0I
W
Reset
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
Figure 25-14. Interrupt Flag 1 Register (CANx_IFLAG1)
Table 25-15. CANx_IFLAG1 Field Descriptions
Field
Description
BUF31I–
BUF8I
Message Buffer n Interrupt. Each bit represents the respective FlexCAN message buffer (MB31 to MB8)
interrupt. Write 1 to clear.
0 No such occurrence
1 The corresponding buffer has successfully completed transmission or reception.
BUF7I
Buffer MB7 Interrupt or “FIFO Overflow”
If the FIFO is not enabled, this bit flags the interrupt for MB7. If the FIFO is enabled, this flag indicates an
overflow condition in the FIFO (frame lost because FIFO is full).
0 No such occurrence
1 MB7 completed transmission/reception or FIFO overflow
BUF6I
Buffer MB6 Interrupt or “FIFO Warning”
If the FIFO is not enabled, this bit flags the interrupt for MB6. If the FIFO is enabled, this flag indicates that 4
out of 6 buffers of the FIFO are already occupied (FIFO almost full).
0 No such occurrence
1 MB6 completed transmission/reception or FIFO almost full
BUF5I
Buffer MB5 Interruptor “Frames Available in FIFO”
If the FIFO is not enabled, this bit flags the interrupt for MB5. If the FIFO is enabled, this flag indicates that
at least one frame is available to be read from the FIFO.
0 No such occurrence
1 MB5 completed transmission/reception or frames available in the FIFO
BUF4I–
BUF0I
Buffer MBn Interrupt or “Reserved”
If the FIFO is not enabled, these bits flag the interrupts for MB0 to MB4. If the FIFO is enabled, these flags
are not used and must be considered as reserved locations.
0 No such occurrence
1 Corresponding MB completed transmission/reception