MC912DG128ACPVE Datasheet, PDF (336/478 Pages) Freescale Semiconductor, Inc – Upward compatible with M68HC11 instruction set

Freescale Semiconductor, Inc.
MSCAN Controller
– Receiver error passive: the receive error counter has
exceeded the error passive limit of 127 and msCAN12 has
gone to error passive state.
– Transmitter error passive: the transmit error counter has
exceeded the error passive limit of 127 and msCAN12 has
gone to error passive state.
– Bus off: the transmit error counter has exceeded 255 and
msCAN12 has gone to BUSOFF state.
18.6.1 Interrupt Acknowledge
Interrupts are directly associated with one or more status flags in either
the msCAN12 receiver flag register (CRFLG) or the msCAN12
transmitter flag register (CTFLG). Interrupts are pending as long as one
of the corresponding flags is set. The flags in above registers must be
reset within the interrupt handler in order to handshake the interrupt. The
flags are reset through writing a 1 to the corresponding bit position. A flag
can not be cleared if the respective condition still prevails.
NOTE: Bit manipulation instructions (BSET) shall not be used to clear interrupt
flags.
18.6.2 Interrupt Vectors
The msCAN12 supports four interrupt vectors as shown in Table 18-1.
The vector addresses and the relative interrupt priority are dependent on
the chip integration and to be defined.
Technical Data
336
MC68HC912DT128A — Rev 4.0
MSCAN Controller
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