Cirrus Logic EP93xx User Manual
Page 804
28-14
DS785UM1
Copyright 2007 Cirrus Logic
GPIO Interface
EP93xx User’s Guide
2
8
2
8
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GPIOxEOI
Address:
GPIOAEOI: 0x8084_0098 - Write Only
GPIOBEOI: 0x8084_00B4 - Write Only
GPIOFEOI: 0x8084_0054 - Write Only
Definition:
In order to clear an edge sensitive interrupt that can occur over port A/B/F, the user must
write a data value of “1” to the corresponding bit in the GPIOxEOI register bit. The user must
clear an interrupt before changing Port A/B/F from interrupt mode to GPIO mode as the
interrupts are cleared once this change has occurred. Once an interrupt has occurred and the
interrupt service routine has started, one of the first instructions should be a write to this
location in order to clear the interrupt so that subsequent interrupts on the same line are not
missed.
Bit Descriptions:
RSVD:
Reserved. Unknown During Read.
PxINTC:
Clears Interrupts
GPIOxDB
Address:
GPIOADB: 0x8084_00A8 - Read/Write
GPIOBDB: 0x8084_00C4 - Read/Write
GPIOFDB: 0x8084_0064 - Read/Write
Definition:
For each port, if interrupts are enabled, it is possible to debounce the input signal. Setting a
bit in this register enables debouncing for the corresponding interrupt signal; clearing the bit
disables debouncing. Debouncing is implemented by passing the input signal through a 2-bit
shift register clocked by a 128 Hz clock.
31
30
29
28
27
26
25
24
23
22
21
20
19
18
17
16
RSVD
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
RSVD
PxINTC
31
30
29
28
27
26
25
24
23
22
21
20
19
18
17
16
RSVD
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
RSVD
PxINTDB