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PIC24FJ128GA Datasheet(PDF) 11 Page - Microchip Technology |
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PIC24FJ128GA Datasheet(HTML) 11 Page - Microchip Technology |
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11 / 22 page  2008-2013 Microchip Technology Inc. DS80368N-page 11 PIC24FJ256GA110 FAMILY 31. Module: Output Compare (Interrupt) Under certain circumstances, an output com- pare match may cause the interrupt flag (OCxIF) to become set prior to the Change-of-State (COS) of the OCx pin. This has been observed when all of the following are true: • the module is in One-Shot mode (OCM<2:0> = 001, 010 or 100); • one of the timer modules is being used as the time base; and • a timer prescaler other than 1:1 is selected. If the module is re-initialized by clearing OCM<2:0> after the One-Shot compare, the OCx pin may not be driven as expected. Work around After OCxIF is set, allow an interval (in CPU cycles) of at least twice the prescaler factor to elapse before clearing OCM<2:0>. For example, for a prescaler value of 1:8, allow 16 CPU cycles to elapse after the interrupt. Affected Silicon Revisions 32. Module: UART When using UTXISEL<1:0> = 01 (interrupt when last character is shifted out of the Transmit Shift Register), and the final character is being shifted out through the Transmit Shift Register, the TX interrupt may occur before the final bit is shifted out. Work around If it is critical that the interrupt processing occurs only when all transmit operations are complete, after which, the following work around can be implemented: Hold off the interrupt routine processing by adding a loop at the beginning of the routine that polls the Transmit Shift Register empty bit, as shown in Example 2. Affected Silicon Revisions 33. Module: Oscillator (Two-Speed Start-up) Two-Speed Start-up is not functional. Leaving the IESO Configuration bit in its default state (Two-Speed Start-up enabled) may result in unpredictable operation. Work around None. Always program the IESO Configuration bit to disable this feature (CW2<15> = 0). Affected Silicon Revisions EXAMPLE 2: DELAYING THE ISR BY POLLING THE TRMT BIT A3 A5 A6 XX X A3 A5 A6 XX X A3 A5 A6 XX X // in UART2 initialization code ... U2STAbits.UTXISEL0 = 1; // Set to generate TX interrupt when all U2STAbits.UTXISEL1 = 0; // transmit operations are complete. ... U2TXInterrupt(void) { while(U2STAbits.TRMT==0); // wait for the transmit buffer to be empty ... // process interrupt |
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