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PIC12F609-E/PQTP Datasheet(PDF) 89 Page - Microchip Technology |
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PIC12F609-E/PQTP Datasheet(HTML) 89 Page - Microchip Technology |
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89 / 168 page  © 2006 Microchip Technology Inc. Preliminary DS41302A-page 87 PIC12F609/615/12HV609/615 10.4.3 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 ECCPASx bits of the ECCPAS register. A shutdown event may be generated by: •A logic ‘0’ on the INT pin •Comparator • Setting the ECCPASE bit in firmware 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. Refer to Figure 1. 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 10.4.4 “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) FIGURE 10-10: AUTO-SHUTDOWN BLOCK DIAGRAM PSSAC<1> TRISx P1A 0 1 P1A_DRV PSSAC<0> PSSBD<1> TRISx P1B 0 1 PSSBD<0> P1B_DRV 000 001 010 011 100 101 110 111 From Comparator ECCPAS<2:0> R DQ S ECCPASE From Data Bus Write to ECCPASE PRSEN INT |
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