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AN78446 - Interrupt Handling in EZ-USB® FX2LP™ | Cypress Semiconductor

AN78446 - Interrupt Handling in EZ-USB® FX2LP™

Last Updated: 
Dec 22, 2015


EZ-USB® FX2LP incorporates 13 interrupt sources in its interrupt architecture, five standard 8051 interrupts and eight additional EZ-USB® interrupts.

Standard 8051 Interrupts:

  • IE0(INT0): External Interrupt0
  • IE1(INT1): External Interrupt1
  • RI_0 & TI_0: USART1 Interrupt
  • TF0: Timer0 Overflow
  • TF1: Timer1 Overflow

Additional EZ-USB interrupts:

  • TF2: Timer2 Overflow
  • PF1: Wake up pin(WU2)
  • RI_1 & TI_1: UART 1 Transmit and receive
  • USBINT(INT2): USB specific Interrupt
  • I2CINT(INT3): I2C Bus Interrupt
  • IE4(INT4): External Interrupt 4
  • IE5(INT5): External Interrupt 5
  • IE6(INT6): External Interrupt 6

For more, see pdf.

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