MC68HC08AZ32A Datasheet, PDF (340/456 Pages) Motorola, Inc – HCMOS Microcontroller Unit

Freescale Semiconductor, Inc.
MSCAN08 Controller (MSCAN08)
MCU
or MSCAN08
MSCAN08 Running
SLPRQ = 0
SLPAK = 0
MCU
MSCAN08 Sleeping
SLPRQ = 1
SLPAK = 1
Sleep Request
SLPRQ = 1
SLPAK = 0
MSCAN08
Figure 20-6. Sleep Request/Acknowledge Cycle
NOTE: The MCU cannot clear the SLPRQ bit before the MSCAN08 is in Sleep
mode (SLPAK=1).
After wake-up, the MSCAN08 waits for 11 consecutive recessive bits to
synchronize to the bus. As a consequence, if the MSCAN08 is woken-
up by a CAN frame, this frame is not received. The receive message
buffers (RxFG and RxBG) 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 MSCAN08 is still in bus-off state after Sleep mode
was left, it continues counting the 128*11 consecutive recessive bits.
20.9.2 MSCAN08 Soft Reset Mode
In Soft Reset mode, the MSCAN08 is stopped. Registers can still be
accessed. This mode is used to initialize the module configuration, bit
timing and the CAN message filter. See MSCAN08 Module Control
Register 0 on page 355 for a complete description of the Soft Reset
mode.
Technical Data
340
MC68HC08AZ32A — Rev 1.0
MSCAN08 Controller (MSCAN08)
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