MC9S12HY64 Datasheet, PDF (328/792 Pages) Freescale Semiconductor, Inc – S12 Microcontrollers

Freescale’s Scalable Controller Area Network (S12MSCANV3)
Module Base + 0x000C to Module Base + 0x000D
Access: User read/write⁽¹⁾
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 9-16. MSCAN Reserved Register
1. Read: Always reads zero in normal system operation modes
Write: Unimplemented in normal system operation modes
NOTE
Writing to this register when in special systm operating modes can alter the
MSCAN functionality.
9.3.2.14 MSCAN Miscellaneous Register (CANMISC)
This register provides additional features.
Module Base + 0x000D
Access: User read/write⁽¹⁾
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 9-17. MSCAN Miscellaneous Register (CANMISC)
1. Read: Anytime
Write: Anytime; write of ‘1’ clears flag; write of ‘0’ ignored
Table 9-21. 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 9.5.2, “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
9.3.2.15 MSCAN Receive Error Counter (CANRXERR)
This register reflects the status of the MSCAN receive error counter.
MC9S12HY/HA-Family Reference Manual, Rev. 1.04
328
Freescale Semiconductor