MC9S12G FREESCALE [Freescale Semiconductor, Inc], MC9S12G Datasheet - Page 533

• Manufacturer Part Number: MC9S12G
• Description: Ignores external trigger. Performs one conversion sequence and stops.
• Manufacturer: FREESCALE [Freescale Semiconductor, Inc]

16.5
16.5.1
The procedure to initially start up the MSCAN module out of reset is as follows:
If the configuration of registers which are only writable in initialization mode shall be changed:
16.5.2
The bus-off recovery is user configurable. The bus-off state can either be left automatically or on user
request.
For reasons of backwards compatibility, the MSCAN defaults to automatic recovery after reset. In this
case, the MSCAN will become error active again after counting 128 occurrences of 11 consecutive
recessive bits on the CAN bus (see the Bosch CAN 2.0 A/B specification for details).
If the MSCAN is configured for user request (BORM set in
recovery from bus-off starts after both independent events have become true:
These two events may occur in any order.
Freescale Semiconductor
1. Assert CANE
2. Write to the configuration registers in initialization mode
3. Clear INITRQ to leave initialization mode
1. Bring the module into sleep mode by setting SLPRQ and awaiting SLPAK to assert after the CAN
2. Enter initialization mode: assert INITRQ and await INITAK
3. Write to the configuration registers in initialization mode
4. Clear INITRQ to leave initialization mode and continue
•
•
This document is valid for the S12G96 and the S12G128 device. All information related to other devices is preliminary.
bus becomes idle.
128 occurrences of 11 consecutive recessive bits on the CAN bus have been monitored
BOHOLD in
Initialization/Application Information
MSCAN initialization
Bus-Off Recovery
MSCAN Miscellaneous Register (CANMISC)
MC9S12G Family Reference Manual, Rev.1.01
Freescale’s Scalable Controller Area Network (S12MSCANV3)
MSCAN Control Register 1
has been cleared by the user
(CANCTL1)), the
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