MC68HC08AZ0 Datasheet, PDF (369/444 Pages) Motorola, Inc – Advance Information

Freescale Semiconductor, Inc.
msCAN08 Controller (msCAN08)
Low power modes
Low power modes
The msCAN08 has three modes with reduced power consumption
compared to Normal Mode. 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.
WAIT and STOP instruction put the MCU in low power consumption
stand-by mode. Table 2 summarizes the combinations of msCAN08 and
CPU modes. A particular combination of modes is entered for the given
settings of the bits SLPAK and SFTRES. In Sleep and Soft Reset Mode,
power consumption of the msCAN module is lower than in Normal Mode.
In Power Down Mode, no power is consumed in the module and no
registers can be accessed. For all modes, an msCAN wake-up interrupt
can occur only if SLPAK = WUPIE = 1. While the CPU is in Wait Mode,
the msCAN08 is operated as in Normal Mode.
Table 2. msCAN08 vs CPU operating modes
msCAN Mode
Power Down
CPU Mode
STOP
SLPAK = X⁽¹⁾
SFTRES = X
WAIT or RUN
Sleep
SLPAK = 1
SFTRES = 0
Soft Reset
SLPAK = 0
SFTRES = 1
Normal
SLPAK = 0
SFTRES = 0
1. ‘X’ means don’t care.
17-can
MOTOROLA
msCAN08 Controller (msCAN08)
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MC68HC08AZ0
367