mc68hc912d60c Freescale Semiconductor, Inc, mc68hc912d60c Datasheet - Page 317

• Manufacturer Part Number: mc68hc912d60c
• Description: Hc12 Microcontrollers
• Manufacturer: Freescale Semiconductor, Inc

17.8.1 msCAN12 SLEEP Mode
MC68HC912D60A — Rev. 3.1
Freescale Semiconductor
NOTE:
Mode and generate interrupts (registers can be accessed via
background debug mode).
The CPU can request the msCAN12 to enter this low-power mode by
asserting the SLPRQ bit in the Module Configuration Register (see
Figure
on its activity:
The application software must avoid setting up a transmission (by
clearing one or more TXE flag(s)) and immediately request Sleep Mode
(by setting SLPRQ). It then depends on the exact sequence of
•
•
•
If there are one or more message buffers are scheduled for
transmission (TXEx = 0), the msCAN will continue to transmit until
all transmit message buffers are empty (TXEx = 1, transmitted
successfully or aborted) and then goes into Sleep Mode.
If it is receiving, it continues to receive and goes into Sleep Mode
as soon as the CAN bus next becomes idle.
If it is neither transmitting nor receiving, it immediately goes into
Sleep Mode.
17-6). The time when the msCAN12 enters Sleep Mode depends
POWER_DOWN
1. X means don’t care.
SOFT_RESET
msCAN Mode
Table 17-2. msCAN12 vs. CPU operating modes
SLEEP
Normal
MSCAN Controller
CSWAI = X
SFTRES = X
SLPAK = X
STOP
(1)
SFTRES = X
SFTRES = 0
SFTRES = 1
SFTRES = 0
CPU Mode
CSWAI = 1
CSWAI = 0
CSWAI = 0
CSWAI = 0
SLPAK = X
SLPAK = 1
SLPAK = 0
SLPAK = 0
WAIT
SFTRES = 0
SFTRES = 1
SFTRES = 0
CSWAI = X
CSWAI = X
CSWAI = X
SLPAK = 1
SLPAK = 0
SLPAK = 0
RUN
MSCAN Controller
Low Power Modes
Technical Data
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