MC68HC08AZ60 Datasheet, PDF (318/452 Pages) Motorola, Inc – Advance Information

Freescale Semiconductor, Inc.
MSCAN Controller (MSCAN08)
Interrupts
The MSCAN08 supports four interrupt vectors mapped onto eleven
different interrupt sources, any of which can be individually masked (for
details see MSCAN08 Receiver Flag Register (CRFLG) on page 342,
to MSCAN08 Transmitter Control Register on page 348).
• Transmit Interrupt: At least one of the three transmit buffers is
empty (not scheduled) and can be loaded to schedule a message
for transmission. The TXE flags of the empty message buffers are
set.
• Receive Interrupt: A message has been received successfully and
loaded into the foreground receive buffer. This interrupt will be
emitted immediately after receiving the EOF symbol. The RXF flag
is set.
• Wakeup Interrupt: An activity on the CAN bus occurred during
MSCAN08 internal sleep mode.
• Error Interrupt: An overrun, error, or warning condition occurred.
The receiver flag register (CRFLG) will indicate one of the
following conditions:
– Overrun: An overrun condition as described in Receive
Structures on page 310, has occurred.
– Receiver Warning: The receive error counter has reached the
CPU Warning limit of 96.
– Transmitter Warning: The transmit error counter has reached
the CPU Warning limit of 96.
– Receiver Error Passive: The receive error counter has
exceeded the error passive limit of 127 and MSCAN08 has
gone to error passive state.
– Transmitter Error Passive: The transmit error counter has
exceeded the error passive limit of 127 and MSCAN08 has
gone to error passive state.
– Bus Off: The transmit error counter has exceeded 255 and
MSCAN08 has gone to bus off state.
MC68HC08AZ60 — Rev 1.0
318
MSCAN Controller (MSCAN08)
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14-mscan
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