mc68hc08qa24 Freescale Semiconductor, Inc, mc68hc08qa24 Datasheet - Page 354

• Manufacturer Part Number: mc68hc08qa24
• Description: M68hc08 Microcontrollers
• Manufacturer: Freescale Semiconductor, Inc

CAN Controller
22.9.2 CPU Wait Mode
Technical Data
352
NOTE:
When in sleep mode, the MSCAN08 stops its own clocks, leaving the
MCU in normal run mode.
The MSCAN08 will leave sleep mode (wakeup) when bus activity occurs
or when the MCU clears the SLPRQ bit.
The CANTx pin will stay in a recessive state while the MSCAN08 is in
internal sleep mode.
The MCU cannot clear the SLPRQ bit before the MSCAN08 is in sleep
mode (SLPAK = 1).
The MSCAN08 module remains active during CPU wait mode. The
MSCAN08 will stay synchronized to the CAN bus and will generate
enabled transmit, receive, and error interrupts to the CPU. Any such
interrupt will bring the MCU out of wait mode.
OR MSCAN08
Figure 22-6. Sleep Request/Acknowledge Cycle
MCU
MSCAN08 SLEEPING
CAN Controller
SLPRQ = 1
SLPAK = 1
MSCAN08 RUNNING
SLPRQ = 0
SLPAK = 0
MSCAN08
SLEEP REQUEST
SLPRQ = 1
SLPAK = 0
Freescale Semiconductor
MCU
MC68HC08QA24