at75c220 ATMEL Corporation, at75c220 Datasheet - Page 73

• Manufacturer Part Number: at75c220
• Description: Smart Internet Appliance Processor Siap
• Manufacturer: ATMEL Corporation

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.
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 = Interrupt is enabled on the corresponding pin.
0 = Interrupt is not enabled on the corresponding pin.
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.
P31
P23
P15
P31
P23
P15
31
23
15
P7
31
23
15
P7
7
7
P30
P22
P14
P30
P22
P14
30
22
14
P6
30
22
14
P6
6
6
P29
P21
P13
P29
P21
P13
P5
P5
29
21
13
29
21
13
5
5
P28
P20
P12
P28
P20
P12
P4
P4
28
20
12
28
20
12
4
4
P27
P19
P11
P27
P19
P11
P3
P3
27
19
11
27
19
11
3
3
P26
P18
P10
P26
P18
P10
P2
P2
26
18
10
26
18
10
2
2
P25
P17
P25
P17
P9
P1
P9
P1
25
17
25
17
9
1
9
1
P24
P16
P24
P16
24
16
P8
P0
24
16
P8
P0
8
0
8
0
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