Datasheet

MSCAN Controller
Technical Data MC68HC912DT128A — Rev 4.0
338 MSCAN Controller MOTOROLA
18.8 Low Power Modes
The msCAN12 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.
The WAI and STOP instructions put the MCU in low power consumption
stand-by modes. Table 18-2 summarizes the combinations of msCAN12
and CPU modes. A particular combination of modes is entered for the
given settings of the bits CSWAI, SLPAK, and SFTRES. For all modes,
an msCAN wake-up interrupt can occur only if SLPAK=WUPIE=1. While
the CPU is in Wait Mode, the msCAN12 can be operated in Normal
Mode and emit interrupts (registers can be accessed via background
debug mode).
Table 18-2. msCAN12 vs. CPU operating modes
msCAN Mode
CPU Mode
STOP WAIT RUN
POWER_DOWN
CSWAI = X
(1)
SLPAK = X
SFTRES = X
1. X means don’t care.
CSWAI = 1
SLPAK = X
SFTRES = X
SLEEP
CSWAI = 0
SLPAK = 1
SFTRES = 0
CSWAI = X
SLPAK = 1
SFTRES = 0
SOFT_RESET
CSWAI = 0
SLPAK = 0
SFTRES = 1
CSWAI = X
SLPAK = 0
SFTRES = 1
Normal
CSWAI = 0
SLPAK = 0
SFTRES = 0
CSWAI = X
SLPAK = 0
SFTRES = 0
Frees
cale Semiconductor,
I
Freescale Semiconductor, Inc.
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