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PIC18F23K20-E/ML Datasheet(PDF) 183 Page - Microchip Technology |
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PIC18F23K20-E/ML Datasheet(HTML) 183 Page - Microchip Technology |
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183 / 456 page  2010 Microchip Technology Inc. DS41303G-page 183 PIC18F2XK20/4XK20 16.4.4 ENHANCED PWM AUTO-SHUTDOWN MODE 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 ECCPAS<2:0> bits of the ECCP1AS register. A shutdown event may be generated by: •A logic ‘0’ on the FLT0 pin • Comparator C1 • Comparator C2 • Setting the ECCPASE bit in firmware A shutdown condition is indicated by the ECCPASE (Auto-Shutdown Event Status) bit of the ECCP1AS 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 16.4.5 “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 ECCP1AS register. Each pin pair may be placed into one of three states: • Drive logic ‘1’ • Drive logic ‘0’ • Tri-state (high-impedance) REGISTER 16-2: ECCP1AS: ENHANCED CAPTURE/COMPARE/PWM AUTO-SHUTDOWN CONTROL REGISTER R/W-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0 ECCPASE ECCPAS2 ECCPAS1 ECCPAS0 PSSAC1 PSSAC0 PSSBD1 PSSBD0 bit 7 bit 0 Legend: R = Readable bit W = Writable bit U = Unimplemented bit, read as ‘0’ -n = Value at POR ‘1’ = Bit is set ‘0’ = Bit is cleared x = Bit is unknown bit 7 ECCPASE: ECCP Auto-Shutdown Event Status bit 1 = A shutdown event has occurred; ECCP outputs are in shutdown state 0 = ECCP outputs are operating bit 6-4 ECCPAS<2:0>: ECCP Auto-shutdown Source Select bits 000 = Auto-Shutdown is disabled 001 = Comparator C1OUT output is high 010 = Comparator C2OUT output is high 011 = Either Comparator C1OUT or C2OUT is high 100 =VIL on FLT0 pin 101 =VIL on FLT0 pin or Comparator C1OUT output is high 110 =VIL on FLT0 pin or Comparator C2OUT output is high 111 =VIL on FLT0 pin or Comparator C1OUT or Comparator C2OUT is high bit 3-2 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 bit 1-0 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 |
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