MC68HC12 MOTOROLA [Motorola, Inc], MC68HC12 Datasheet - Page 337

• Manufacturer Part Number: MC68HC12
• Description: The MC68HC912DT128A microcontroller unit (MCU) is a 16-bit device composed of standard on-chip peripherals including a 16-bit central processing unit
• Manufacturer: MOTOROLA [Motorola, Inc]

18.7 Protocol Violation Protection
MC68HC912DT128A — Rev 4.0
MOTOROLA
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
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.
Function
Interrupts
Wake-Up
Transmit
Receive
Error
Table 18-1. msCAN12 Interrupt Vectors
MSCAN Controller
msCAN12 Module Control Register
RWRNIF
TWRNIF
RERRIF
TERRIF
BOFFIF
Source
WUPIF
OVRIF
TXE0
TXE1
TXE2
RXF
Local Mask
RWRNIE
TWRNIE
RERRIE
TERRIE
BOFFIE
TXEIE0
TXEIE1
TXEIE2
WUPIE
OVRIE
RXFIE
Protocol Violation Protection
Global Mask
MSCAN Controller
(CMCR0))
Technical Data
I Bit
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