MC68HC912DG128 Datasheet, PDF (325/452 Pages) Motorola, Inc – Microcontrollers

Freescale Semiconductor, Inc.
MSCAN Controller
Low Power Modes
17.8 Low Power Modes
In addition to normal mode, the msCAN12 has three modes with
reduced power consumption: SLEEP, SOFT_RESET and
POWER_DOWN. In SLEEP and SOFT_RESET modes, 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 17-2 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 generate interrupts (registers can be accessed via
background debug mode).
Table 17-2. msCAN12 vs. CPU operating modes
msCAN Mode
POWER_DOWN
STOP
CSWAI = X⁽¹⁾
SLPAK = X
SFTRES = X
SLEEP
SOFT_RESET
Normal
CPU Mode
WAIT
CSWAI = 1
SLPAK = X
SFTRES = X
CSWAI = 0
SLPAK = 1
SFTRES = 0
CSWAI = 0
SLPAK = 0
SFTRES = 1
CSWAI = 0
SLPAK = 0
SFTRES = 0
RUN
CSWAI = X
SLPAK = 1
SFTRES = 0
CSWAI = X
SLPAK = 0
SFTRES = 1
CSWAI = X
SLPAK = 0
SFTRES = 0
1. X means don’t care.
MC68HC912DG128 — Rev 3.0
MOTOROLA
MSCAN Controller
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Go to: www.freescale.com
Technical Data
325