IO_IEVR register
| PA0_IEV | PA0_IEV : Interrupt polarity event for Port A I/Os. 0: falling edge / low level. 1: rising edge / high level. | 
| PA1_IEV | PA1_IEV : Interrupt polarity event for Port A I/Os. 0: falling edge / low level. 1: rising edge / high level. | 
| PA2_IEV | PA2_IEV : Interrupt polarity event for Port A I/Os. 0: falling edge / low level. 1: rising edge / high level. | 
| PA3_IEV | PA3_IEV : Interrupt polarity event for Port A I/Os. 0: falling edge / low level. 1: rising edge / high level. | 
| PA8_IEV | PA8_IEV : Interrupt polarity event for Port A I/Os. 0: falling edge / low level. 1: rising edge / high level. | 
| PA9_IEV | PA9_IEV : Interrupt polarity event for Port A I/Os. 0: falling edge / low level. 1: rising edge / high level. | 
| PA10_IEV | PA10_IEV : Interrupt polarity event for Port A I/Os. 0: falling edge / low level. 1: rising edge / high level. | 
| PA11_IEV | PA11_IEV : Interrupt polarity event for Port A I/Os. 0: falling edge / low level. 1: rising edge / high level. | 
| PB0_IEV | PB0_IEV : Interrupt polarity event for Port B I/Os. 0: falling edge / low level. 1: rising edge / high level. | 
| PB1_IEV | PB1_IEV : Interrupt polarity event for Port B I/Os. 0: falling edge / low level. 1: rising edge / high level. | 
| PB2_IEV | PB2_IEV : Interrupt polarity event for Port B I/Os. 0: falling edge / low level. 1: rising edge / high level. | 
| PB3_IEV | PB3_IEV : Interrupt polarity event for Port B I/Os. 0: falling edge / low level. 1: rising edge / high level. | 
| PB4_IEV | PB4_IEV : Interrupt polarity event for Port B I/Os. 0: falling edge / low level. 1: rising edge / high level. | 
| PB5_IEV | PB5_IEV : Interrupt polarity event for Port B I/Os. 0: falling edge / low level. 1: rising edge / high level. | 
| PB6_IEV | PB6_IEV : Interrupt polarity event for Port B I/Os. 0: falling edge / low level. 1: rising edge / high level. | 
| PB7_IEV | PB7_IEV : Interrupt polarity event for Port B I/Os. 0: falling edge / low level. 1: rising edge / high level. | 
| PB12_IEV | PB12_IEV : Interrupt polarity event for Port B I/Os. 0: falling edge / low level. 1: rising edge / high level. | 
| PB13_IEV | PB13_IEV : Interrupt polarity event for Port B I/Os. 0: falling edge / low level. 1: rising edge / high level. | 
| PB14_IEV | PB14_IEV : Interrupt polarity event for Port B I/Os. 0: falling edge / low level. 1: rising edge / high level. | 
| PB15_IEV | PB15_IEV : Interrupt polarity event for Port B I/Os. 0: falling edge / low level. 1: rising edge / high level. |