Motorola MCF5281 用户手册
MOTOROLA
Chapter 25. FlexCAN
25-27
Programmer’s Model
25.5.7.1 Receive Mask Registers (RXGMASK, RX14MASK, RX15MASK)
The Rx global mask register (RXGMASK) is composed of 4 bytes. The mask bits are
applied to all Rx-Identifiers excluding Rx-buffers 14-15, that have their specific Rx-mask
registers (RX14MASK and RX15MASK).
applied to all Rx-Identifiers excluding Rx-buffers 14-15, that have their specific Rx-mask
registers (RX14MASK and RX15MASK).
MB14-Id
1 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
Rx_Global_Mas
k
1 1 1 1 1 1 1 1 1 1 0
1 1 1 1 1 1 1 0 0 0 0 0 0 0 0 0 0 1
Rx_Msg in
1 1 1 1 1 1 1 1 0 0 1
1
0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1
3
1
Rx_Msg in
1 1 1 1 1 1 1 1 0 0 1
0
2
2
Rx_Msg in
1 1 1 1 1 1 1 1 0 0 1
1
0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 0
3
Rx_Msg in
0 1 1 1 1 1 1 1 0 0 0
0
4
Rx_Msg in
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
5
Rx_14_Mask
0 1 1 1 1 1 1 1 1 1 1
1 1 1 1 1 1 1 0 0 0 0 0 0 0 0 0 0 0
Rx_Msg in
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
6
Rx_Msg in
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
7
1
Match for Extended Format (MB3).
2
Match for Standard Format. (MB2).
3
Un-Match for MB3 because of ID0.
4
Un-Match for MB2 because of ID28.
5
Un-Match for MB3 because of ID28, Match for MB14.
6
Un-Match for MB14 because of ID27.
7
Match for MB14.
31
21
20
19
18
17
16
Field
MID[28:18]
—
MID[17:15]
Reset
1111_1111_1110_1111
R/W
R/W
15
1
0
Field
MID[14:0]
—
Reset
1111_1111_1111_1110
R/W
R/W
Address
IPSBAR + 0x1C_0010 (RXGMASK), 0x1C_0014 (RX14MASK), 0x1C_0018 (RX15MASK)
Figure 25-12. Rx Mask Registers (RXGMASK, RX14MASK, and RX15MASK)
Table 25-15. Mask examples for Normal/Extended Messages (continued)
Base ID
ID28.................ID18
I
D
E
E
Extended ID
ID17......................................ID0
Match