Datasheet

Freescale’s Scalable Controller Area Network (S12MSCANV3)
MC9S12G Family Reference Manual, Rev.1.23
Freescale Semiconductor 605
NOTE
Writing to this register when in special system operating modes can alter the
MSCAN functionality.
18.3.2.14 MSCAN Miscellaneous Register (CANMISC)
This register provides additional features.
18.3.2.15 MSCAN Receive Error Counter (CANRXERR)
This register reflects the status of the MSCAN receive error counter.
1
Read: Always reads zero in normal system operation modes
Write: Unimplemented in normal system operation modes
Module Base + 0x000D Access: User read/write
1
1
Read: Anytime
Write: Anytime; write of ‘1’ clears flag; write of ‘0’ ignored
76543210
R0000000
BOHOLD
W
Reset: 00000000
= Unimplemented
Figure 18-17. MSCAN Miscellaneous Register (CANMISC)
Table 18-21. 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 18.5.2, “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
Module Base + 0x000E Access: User read/write
1
1
Read: Only when in sleep mode (SLPRQ = 1 and SLPAK = 1) or initialization mode (INITRQ = 1 and INITAK = 1)
Write: Unimplemented
76543210
R RXERR7 RXERR6 RXERR5 RXERR4 RXERR3 RXERR2 RXERR1 RXERR0
W
Reset: 00000000
= Unimplemented
Figure 18-18. MSCAN Receive Error Counter (CANRXERR)