mcf51ac256a Freescale Semiconductor, Inc, mcf51ac256a Datasheet - Page 334

• Manufacturer Part Number: mcf51ac256a
• Description: Mcf51ac Flexis
• Manufacturer: Freescale Semiconductor, Inc

Freescale’s Controller Area Network (MSCANV1)
Read: Anytime
Write: Anytime; write of ‘1’ clears flag; write of ‘0’ ignored
15.3.13 MSCAN Receive Error Counter (CANRXERR)
This register reflects the status of the MSCAN receive error counter.
Read: Only when in sleep mode (SLPRQ = 1 and SLPAK = 1) or initialization mode (INITRQ = 1 and
INITAK = 1)
Write: Unimplemented
15.3.14 MSCAN Transmit Error Counter (CANTXERR)
This register reflects the status of the MSCAN transmit error counter.
15-18
BOHOLD
Field
0
Reset:
Reset:
W
W
R
R
Bus-off State Hold Until User Request — If BORM is set in
(CANCTL1),
recovery from bus-off. Refer to
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
RXERR7
TXERR7
Reading this register when in any other mode other than sleep or
initialization mode may return an incorrect value. For MCUs with dual
CPUs, this may result in a CPU fault condition.
Writing to this register when in special modes can alter the MSCAN
functionality.
0
0
7
7
MCF51AC256 ColdFire Integrated Microcontroller Reference Manual, Rev. 5
this bit indicates whether the module has entered the bus-off state. Clearing this bit requests the
Figure 15-17. MSCAN Transmit Error Counter (CANTXERR)
Figure 15-16. MSCAN Receive Error Counter (CANRXERR)
RXERR6
TXERR6
= Unimplemented
= Unimplemented
Table 15-19. CANMISC Register Field Descriptions
6
0
6
0
RXERR5
TXERR5
Section 15.6.2, “Bus-Off
0
0
5
5
RXERR4
TXERR4
NOTE
4
0
4
0
Description
Recovery,” for details.
RXERR3
TXERR3
0
0
Section 15.3.2, “MSCAN Control Register 1
3
3
RXERR2
TXERR2
2
0
2
0
RXERR1
TXERR1
Freescale Semiconductor
0
0
1
1
RXERR0
TXERR0
0
0
0
0