MC68HC908AZ32ACFU MOTOROLA [Motorola, Inc], MC68HC908AZ32ACFU Datasheet - Page 406

• Manufacturer Part Number: MC68HC908AZ32ACFU
• Description: Microcontrollers
• Manufacturer: MOTOROLA [Motorola, Inc]

MSCAN Controller (MSCAN08)
24.8 Protocol Violation Protection
24.9 Low Power Modes
Advance Information
406
The MSCAN08 will protect the user from accidentally violating the CAN
protocol through programming errors. The protection logic implements
the following features:
In addition to normal mode, the MSCAN08 has three modes with
reduced power consumption: Sleep, Soft Reset and Power Down
modes. In Sleep and Soft Reset mode, power consumption is reduced
by stopping all clocks except those to access the registers. In Power
Down mode, all clocks are stopped and no power is consumed.
The WAIT and STOP instructions put the MCU in low power
consumption stand-by modes.
of MSCAN08 and CPU modes. A particular combination of modes is
entered for the given settings of the bits SLPAK and SFTRES. For all
modes, an MSCAN wake-up interrupt can occur only if
SLPAK=WUPIE=1.
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The receive and transmit error counters cannot be written or
otherwise manipulated.
All registers which control the configuration of the MSCAN08 can
not be modified while the MSCAN08 is on-line. The SFTRES bit in
the MSCAN08 module control register (see
Control Register 0
following registers:
– MSCAN08 module control register 1 (CMCR1)
– MSCAN08 bus timing register 0 and 1 (CBTR0 and CBTR1)
– MSCAN08 identifier acceptance control register (CIDAC)
– MSCAN08 identifier acceptance registers (CIDAR0–3)
– MSCAN08 identifier mask registers (CIDMR0–3)
The TxCAN pin is forced to recessive when the MSCAN08 is in
any of the Low Power Modes.
MSCAN Controller (MSCAN08)
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on page 424) serves as a lock to protect the
Table 24-2
summarizes the combinations
68HC908AZ32A — Rev 0.0
MSCAN08 Module
MOTOROLA