8-bit AVR Microcontroller

Pin Change Interrupt Flag Register

Name:
PCIFR
Offset:
0x11
Reset:
0x00
Access:
-
Bit76543210
PCIF1PCIF0
AccessR/WR/W
Reset00

Bit 1 – PCIF1: Pin Change Interrupt Flag 1

Pin Change Interrupt Flag 1

When a logic change on any PCINT[11:8] pin triggers an interrupt request, PCIF1 becomes set (one). If the I-bit in SREG and the PCIE1 bit in PCICR are set (one), the MCU will jump to the corresponding Interrupt Vector. The flag is cleared when the interrupt routine is executed. Alternatively, the flag can be cleared by writing a logical one to it.

Bit 0 – PCIF0: Pin Change Interrupt Flag 0

Pin Change Interrupt Flag 0

When a logic change on any PCINT[7:0] pin triggers an interrupt request, PCIF0 becomes set (one). If the I-bit in SREG and the PCIE0 bit in PCICR are set (one), the MCU will jump to the corresponding Interrupt Vector. The flag is cleared when the interrupt routine is executed. Alternatively, the flag can be cleared by writing a logical one to it.