mc68hc08az60 Freescale Semiconductor, Inc, mc68hc08az60 Datasheet - Page 322

• Manufacturer Part Number: mc68hc08az60
• Description: M68hc08 Family Of 8-bit Microcontroller Units Mcus
• Manufacturer: Freescale Semiconductor, Inc

MSCAN Controller (MSCAN08)
MC68HC08AZ60 — Rev 1.0
322
NOTE:
MSCAN08 is in buss-off state, it stops counting the 128*11 consecutive
recessive bits due to the stopped clocks. The TxCAN pin stays in
recessive state. If RXF=1, the message can be read and RXF can be
cleared. Copying of RxGB into RxFG doesn’t take place while in Sleep
mode. It is possible to access the transmit buffers and to clear the TXE
flags. No message abort takes place while in Sleep mode.
The MSCAN08 leaves Sleep mode (wake-up) when:
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:
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bus activity occurs or
the MCU clears the SLPRQ bit or
the MCU sets the SFTRES bit
or MSCAN08
MSCAN Controller (MSCAN08)
MCU
Figure 6. Sleep Request/Acknowledge Cycle
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MSCAN08 Sleeping
SLPRQ = 1
SLPAK = 1
MSCAN08 Running
SLPRQ = 0
SLPAK = 0
MSCAN08
Sleep Request
SLPRQ = 1
SLPAK = 0
MCU
MOTOROLA
18-mscan