MC68HC12 Datasheet, PDF (337/478 Pages) Motorola, Inc – The MC68HC912DT128A microcontroller unit (MCU) is a 16-bit device composed of standard on-chip peripherals including a 16-bit central processing unit

MSCAN Controller
Protocol Violation Protection
Table 18-1. msCAN12 Interrupt Vectors
Function
Wake-Up
Error
Interrupts
Receive
Transmit
Source
WUPIF
RWRNIF
TWRNIF
RERRIF
TERRIF
BOFFIF
OVRIF
RXF
TXE0
TXE1
TXE2
Local Mask
WUPIE
RWRNIE
TWRNIE
RERRIE
TERRIE
BOFFIE
OVRIE
RXFIE
TXEIE0
TXEIE1
TXEIE2
Global Mask
I Bit
18.7 Protocol Violation Protection
The msCAN12 will protect the user from accidentally violating the CAN
protocol through programming errors. The protection logic implements
the following features:
• The receive and transmit error counters cannot be written or
otherwise manipulated.
• All registers which control the configuration of the msCAN12 can
not be modified while the msCAN12 is on-line. The SFTRES bit in
CMCR0 (see msCAN12 Module Control Register (CMCR0))
serves as a lock to protect the following registers:
– msCAN12 module control register 1 (CMCR1)
– msCAN12 bus timing register 0 and 1 (CBTR0, CBTR1)
– msCAN12 identifier acceptance control register (CIDAC)
– msCAN12 identifier acceptance registers (CIDAR0–7)
– msCAN12 identifier mask registers (CIDMR0–7)
• The TxCAN pin is forced to recessive when the msCAN12 is in any
of the low power modes.
MC68HC912DT128A — Rev 4.0
MOTOROLA
MSCAN Controller
Technical Data
337