mc68hc912dg128 Freescale Semiconductor, Inc, mc68hc912dg128 Datasheet - Page 327

• Manufacturer Part Number: mc68hc912dg128
• Description: M68hc12 Microcontrollers
• Manufacturer: Freescale Semiconductor, Inc

17.8.2 msCAN12 SOFT_RESET Mode
MC68HC912DG128 — Rev 3.0
MOTOROLA
NOTE:
The MCU cannot clear the SLPRQ bit before the msCAN12 is in Sleep
Mode (SLPAK = 1).
After wake-up, the msCAN12 waits for 11 consecutive recessive bits to
synchronize to the bus. As a consequence, if the msCAN12 is woken-up
by a CAN frame, this frame is not received. The receive message buffers
(RxBG and RxFG) contain messages if they were received before sleep
mode was entered. All pending actions are executed upon wake-up:
copying of RxBG into RxFG, message aborts and message
transmissions. If the msCAN12 is still in bus-off state after leaving Sleep
Mode, it continues counting the 128*11 consecutive recessive bits.
In SOFT_RESET mode, the msCAN12 is stopped. Registers can still be
accessed. This mode is used to initialize the module configuration, bit
timing, and the CAN message filter. See
Register 0 (CMCR0)
mode.
Freescale Semiconductor, Inc.
For More Information On This Product,
or msCAN12
MCU
Figure 17-6. SLEEP Request / Acknowledge Cycle
msCAN12 Sleeping
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SLPRQ = 1
SLPAK = 1
MSCAN Controller
for a complete description of the SOFT_RESET
msCAN12 Running
SLPRQ = 0
msCAN12
SLPAK = 0
msCAN12 Module Control
SLEEP Request
SLPRQ = 1
SLPAK = 0
MCU
MSCAN Controller
Low Power Modes
Technical Data
327