Freescale’s Scalable Controller Area Network (S12MSCANV3)
MC9S12XHY-Family Reference Manual, Rev. 1.01
362
Freescale Semiconductor
NOTE
Writing to this register when in special system operating modes can alter the
MSCAN functionality.
11.3.2.14 MSCAN Miscellaneous Register (CANMISC)
This register provides additional features.
11.3.2.15 MSCAN Receive Error Counter (CANRXERR)
This register reflects the status of the MSCAN receive error counter.
Module Base + 0x000C to Module Base + 0x000D
Access: User read/write
(1)
1. Read: Always reads zero in normal system operation modes
Write: Unimplemented in normal system operation modes
7
6
5
4
3
2
1
0
R
0
0
0
0
0
0
0
0
W
Reset:
0
0
0
0
0
0
0
0
= Unimplemented
Figure 11-16. MSCAN Reserved Register
Module Base + 0x000D
Access: User read/write
(1)
1. Read: Anytime
Write: Anytime; write of ‘1’ clears flag; write of ‘0’ ignored
7
6
5
4
3
2
1
0
R
0
0
0
0
0
0
0
BOHOLD
W
Reset:
0
0
0
0
0
0
0
0
= Unimplemented
Figure 11-17. MSCAN Miscellaneous Register (CANMISC)
Table 11-21. CANMISC Register Field Descriptions
Field
Description
0
BOHOLD
Bus-off State Hold Until User Request — If BORM is set in MSCAN Control Register 1 (CANCTL1)
,
this bit
indicates whether the module has entered the bus-off state. Clearing this bit requests the recovery from bus-off.
Refer to
Section 11.5.2, “Bus-Off Recovery
,” for details.
0 Module is not bus-off or recovery has been requested by user in bus-off state
1 Module is bus-off and holds this state until user request
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