Rainbow Electronics AT75C220 - Manual (Page 73)

AT75C220
73
PIO Interrupt Mask Register
Register Name:PIO_IMR
Access Type:Read-only
Reset Value:0
This register shows which pins have interrupts enabled. It is updated when interrupts are enabled or disabled by writing to
PIO_IER or PIO_IDR.
1 = Interrupt is enabled on the corresponding pin.
0 = Interrupt is not enabled on the corresponding pin.
PIO Interrupt Status Register
Register Name:PIO_ISR
Access Type:Read-only
Reset Value:0
This register indicates for each pin when a logic value change has been detected (rising or falling edge). This is valid
whether the PIO is selected for the pin or not and whether the pin is an input or an output.
The register is reset to zero following a read and at reset.
1 = At least one input change has been detected on the corresponding pin since the register was last read.
0 = No input change has been detected on the corresponding pin since the register was last read.
31 30 29 28 27 26 25 24
P31 P30 P29 P28 P27 P26 P25 P24
23 22 21 20 19 18 17 16
P23 P22 P21 P20 P19 P18 P17 P16
15 14 13 12 11 10 9 8
P15 P14 P13 P12 P11 P10 P9 P8
7 6 5 4 3 2 1 0
P7 P6 P5 P4 P3 P2 P1 P0
31 30 29 28 27 26 25 24
P31 P30 P29 P28 P27 P26 P25 P24
23 22 21 20 19 18 17 16
P23 P22 P21 P20 P19 P18 P17 P16
15 14 13 12 11 10 9 8
P15 P14 P13 P12 P11 P10 P9 P8
7 6 5 4 3 2 1 0
P7 P6 P5 P4 P3 P2 P1 P0