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The PWM mode supports an Auto-Shutdown mode that will disable the PWM outputs when an external shutdown event occurs. Auto-Shutdown mode places the PWM output pins into a predetermined state.

This mode is used to help prevent the PWM from damaging the application. The auto-shutdown sources are selected using the ECCPASx bits of the ECCPAS register. A shutdown event may be generated by:

A logic ‘0’ on the INT pin

Comparator C1

Comparator C2

Setting the ECCPASE bit in firmware if read microcontroller atmega1284p flash

A shutdown condition is indicated by the ECCPASE

(Auto-Shutdown Event Status) bit of the ECCPAS register. If the bit is a ‘0’, the PWM pins are operating normally. If the bit is a ‘1’, the PWM outputs are in the shutdown state.

When a shutdown event occurs, two things happen:

The ECCPASE bit is set to ‘1’. The ECCPASE will remain set until cleared in firmware or an auto-restart occurs (see Section 11.4.5 “Auto-Restart Mode”).

The enabled PWM pins are asynchronously placed in their shutdown states. The PWM output pins are grouped into pairs [P1A/P1C] and [P1B/P1D]. The state of each pin pair is determined by the PSSAC and PSSBD bits of the ECCPAS register. Each pin pair may be placed into one of three states:

• Drive logic ‘1’
• Drive logic ‘0’
• Tri-state (high-impedance)Note 1:ECCPASE: ECCP Auto-Shutdown Event Status bit

  1 = A shutdown event has occurred; ECCP outputs are in shutdown state

  0 = ECCP outputs are operating

  ECCPAS<2:0>: ECCP Auto-shutdown Source Select bits

  000 = Auto-Shutdown is disabled

  001 = Comparator C1 output change

  010 = Comparator C2 output change(1)

  011 = Either Comparator C1 or C2 change

  100 = VIL on INT pin

  101 = VIL on INT pin or Comparator C1 change

  110 = VIL on INT pin or Comparator C2 change

  111 = VIL on INT pin or Comparator C1 or C2 change

  PSSACn: Pins P1A and P1C Shutdown State Control bits

  00 = Drive pins P1A and P1C to ‘0’

  01 = Drive pins P1A and P1C to ‘1’

  1x = Pins P1A and P1C tri-state

  PSSBDn: Pins P1B and P1D Shutdown State Control bits

  00 = Drive pins P1B and P1D to ‘0’

  01 = Drive pins P1B and P1D to ‘1’

  1x = Pins P1B and P1D tri-state

   

  If C2SYNC is enabled, the shutdown will be delayed by Timer1 before read chip atmega640v binary.
  The Enhanced PWM can be configured to automatically restart the PWM signal once the auto-shutdown condition has been removed. Auto-restart is enabled by setting the PRSEN bit in the PWM1CON register.If auto-restart is enabled, the ECCPASE bit will remain set as long as the auto-shutdown condition is active. When the auto-shutdown condition is removed, the ECCPASE bit will be cleared via hardware and normal operation will resume.