Figure 28-2. Signal Connections Within The Standard Gpio Port Control Logic (Ports C, D, E, G, H) - Cirrus Logic EP93 Series User Manual

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.
28
Figure 28-2
28-4
and Figure 28-3 illustrate the signal connections for GPIO and EGPIO.
Standard GPIO Ports C, D, E, G, and H
DDR
DR
TISR
to PRDATA[7:0]
Figure 28-2. Signal Connections Within the Standard GPIO Port Control Logic
Copyright 2007 Cirrus Logic
OE
DATA
OE
1
0
Register
TESTRDSEL
Read
Select
(Ports C, D, E, G, H)
OE[7:0]
DATA[7:0]
1
0 EP[7:0]
TESTINPSEL
DS785UM1