Datasheet

110
• Bit 8—NMI Edge Select (NMIE)
Bit 8: NMIE Description
0 Interrupt request is detected on falling edge of NMI input (initial value)
1 Interrupt request is detected on rising edge of NMI input
• Bits 7–0—IRQ0–IRQ7 Sense Select (IRQ0S–IRQ7S): These bits set the IRQ0–IRQ7 interrupt
request detection mode.
Bits 7-0: IRQ0S–IRQ7S Description
0 Interrupt request is detected on low level of IRQ input (initial value)
1 Interrupt request is detected on falling edge of IRQ input
6.3.3 IRQ Status Register (ISR)
The ISR is a 16-bit register that indicates the interrupt request status of the external interrupt input
pins IRQ0–IRQ7. When IRQ interrupts are set to edge detection, held interrupt requests can be
withdrawn by writing a 0 to IRQnF after reading an IRQnF = 1.
A power-on reset initializes ISR but the standby mode does not.
Bit: 15 14 13 12 11 10 9 8
————————
Initial value: 0 0 0 0 0 0 0 0
R/W: R R R R R R R R
Bit: 7 6 5 4 3 2 1 0
IRQ0F IRQ1F IRQ2F IRQ3F IRQ4F IRQ5F IRQ6F IRQ7F
Initial value: 0 0 0 0 0 0 0 0
R/W: R/W R/W R/W R/W R/W R/W R/W R/W
• Bits 15–8—Reserved: These bits always read as 0. The write value should always be 0.