
28-4 DS785UM1
Copyright 2007 Cirrus Logic
GPIO Interface
EP93xx User’s Guide
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
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