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PIC18F4520 Datasheet(PDF) 4 Page - Microchip Technology |
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PIC18F4520 Datasheet(HTML) 4 Page - Microchip Technology |
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4 / 16 page  PIC18F2420/2520/4420/4520 DS80209D-page 4 © 2005 Microchip Technology Inc. 12. Module: ECCP The PWM pin(s) may change state if a breakpoint is encountered during emulation and an auto- shutdown event occurs via FLT0. This affects the MPLAB® ICD 2 debugger and the ICE 2000 and ICE 4000 emulators. Work around During emulation, use the comparator for auto- shutdown. Applications which can tolerate a shutdown response time of several TCYs may use the external interrupt flag, INT0IF, to detect a shutdown event and disable the PWM by clearing the ECCPASE bit (ECCP1AS<7>). Date Codes that pertain to this issue: All engineering and production devices. 13. Module: ECCP and CCP When operating either Timer1 or Timer3 as a counter with a prescale value other than 1:1 and operating the ECCP in Compare mode with the Special Event Trigger (CCP1CON bits CCP1M3:CCP1M0 = 1011), the Special Event Trigger Reset of the timer occurs as soon as there is a match between TMRxH:TMRxL and CCPR1H:CCPR1L. This differs from the PIC18F452, where the Special Event Trigger Reset of the timer occurs on the next prescaler output pulse after the match between TMRxH:TMRxL and CCPR1H:CCPR1L. Work around To achieve the same timer Reset period on the PIC18F4520 family as the PIC18F452 family for a given clock source, add 1 to the value in CCPR1H:CCPR1L. In other words, if CCPR1H:CCPR1L = x for the PIC18F452, to achieve the same Reset period on the PIC18F4520 family, CCPR1H:CCPR1L = x + 1, where the prescale is 1, 2, 4 or 8 depending on the T1CKPS1:T1CKPS0 bit values. Date Codes that pertain to this issue: All engineering and production devices. 14. Module: ECCP When a shutdown condition occurs, the output port is made inactive for the duration of the event. After the event that caused the shutdown ends, the ECCP module enables the PWM output right away instead of waiting until the beginning of the next PWM cycle. Work around Disable the auto-restart feature in software, polling the Timer2 Interrupt Flag (TMR2IF) and wait until it is set before clearing the ECCPASE bit. Date Codes that pertain to this issue: All engineering and production devices. 15. Module: ECCP When switching direction in Full-Bridge PWM mode, the modulated outputs will switch immedi- ately instead of waiting for the next PWM cycle. This may generate unexpected short pulses on the modulated outputs. Work around Disable the PWM or set duty cycle to zero prior to switching directions. Date Codes that pertain to this issue: All engineering and production devices. |
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Similar Description - PIC18F4520 |
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