Cirrus Logic EP93xx - Manual (Page 794)

28-4 DS785UM1
Copyright 2007 Cirrus Logic
GPIO Interface
EP93xx User’s Guide
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8
2
8
28
In order to stop any spurious interrupts that may occur during the programming of the
GPIOxINTTYPEx registers, the following sequence should be observed:
1. Disable interrupt by writing to GPIO Interrupt Enable register.
2. Set interrupt type by writing GPIOxINTTYPE1/2 register.
3. Clear interrupt by writing to GPIOxEOI register.
4. Enable interrupt by writing to GPIO Interrupt Enable register.
Figure 28-2 and Figure 28-3 illustrate the signal connections for GPIO and EGPIO.
Figure 28-2. Signal Connections Within the Standard GPIO Port Control Logic
(Ports C, D, E, G, H)
DDR OE[7:0] OE
Standard GPIO Ports C, D, E, G, and H
DR DATA DATA[7:0]
EP[7:0]
TISR OE
to PRDATA[7:0]
Register
Read
Select
TESTINPSEL
TESTRDSEL
0
1
1
0