38.2.6.3 Wake-Up From Sleep

Upon a wake-up from Sleep mode, the WAKIF flag is set.

The module will monitor the CAN receive line for activity while the module is Sleeping. The device will generate a wake-up interrupt on the falling edges of CxRX if WAKIE is enabled.

The device will exit Sleep mode after a new mode request or a negative edge on CxRX.

The module will be in Sleep mode if either of the following is true:
  • The system is in Sleep mode following Disable mode.
  • The system is in Idle mode with SIDL = 1.
Note:
  1. If the module is in Sleep mode, the module generates an interrupt if the WAKIE bit (C1INT[30]) is set and bus activity is detected. Due to delays in starting up the oscillator and CPU, the message activity that caused the wake-up will be lost.
  2. The module can be programmed to apply a low-pass filter function to the CAN receive input line while in Disable, Sleep or Idle mode. This feature can be used to protect the module from wake-up due to short glitches on the CAN bus lines. The WAKFIL bit (C1CON[8]) enables or disables the filter while the module is asleep.