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PIC12F615-E/MS Datasheet(PDF) 101 Page - Microchip Technology |
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PIC12F615-E/MS Datasheet(HTML) 101 Page - Microchip Technology |
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101 / 212 page  2010 Microchip Technology Inc. DS41302D-page 101 PIC12F609/615/617/12HV609/615 11.4.4 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 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 11.4.5 “Auto-Restart Mode”). The enabled PWM pins are asynchronously placed in their shutdown states. The state of P1A is determined by the PSSAC bit. The state of P1B is determined by the PSSBD bit. The PSSAC and PSSBD bits are located in the ECCPAS register. Each pin may be placed into one of three states: • Drive logic ‘1’ • Drive logic ‘0’ • Tri-state (high-impedance) FIGURE 11-10: 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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