Cirrus Logic EP93xx - Manual (Page 800)

28-10 DS785UM1
Copyright 2007 Cirrus Logic
GPIO Interface
EP93xx User’s Guide
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1. A read from the data register returns the value of the GPIO module input port. These ports have a
default pin assignment. The read value default is the pin state based on the default pin map.
2. Port E bits 1 and 0 provide the LED driver function. The Port E[1:0] defaults to drive high. A read from
the Port E data register would be expected to return 0x03, if the other pins mapped to Port E inputs are
zero. However since the Port E[7:2] inputs are mapped to IDE control signals, the default read value will
depend on the default action of the IDE controller and the external interface.
3. The RAWSTATUSx registers have pin dependent default read states. The interrupt control registers
default to low level sensitive interrupt on reset. Therefore the external pin state will ripple through the
interrupt logic to determine the RAWSTATUSx default.
Register Descriptions
PxDR
Address:
0x8084_0050 GPIOFIntType2 R/W GPIOFIntType2 0x00
0x8084_0054 Reserved, Read undefined Write Only GPIOFEOI 0x00
0x8084_0058 GPIOFIntEn R/W GPIOFIntEn 0x00
0x8084_005C IntStsF Read only - 0x00
0x8084_0060 RawIntStsF Read only - Note 3
0x8084_0064 GPIOFDB R/W GPIOFDB 0x00
0x8084_0090 GPIOAIntType1 R/W GPIOAIntType1 0x00
0x8084_0094 GPIOAIntType2 R/W GPIOAIntType2 0x00
0x8084_0098 - Write Only GPIOAEOI -
0x8084_009C GPIOAIntEn R/W GPIOAIntEn 0x00
0x8084_00A0 IntStsA Read only - 0x00
0x8084_00A4 RawIntStsA Read only - Note 3
0x8084_00A8 GPIOADB R/W GPIOADB 0x00
0x8084_00AC GPIOBIntType1 R/W GPIOBIntType1 0x00
0x8084_00B0 GPIOBIntType2 R/W GPIOBIntType2 0x00
0x8084_00B4 - Write Only GPIOBEOI -
0x8084_00B8 GPIOBIntEn R/W GPIOBIntEn 0x00
0x8084_00BC IntStsB Read only - 0x00
0x8084_00C0 RawIntStsB Read only - Note 3
0x8084_00C4 GPIOBDB R/W GPIOBDB 0x00
0x8084_00C8 EEDrive R/W EEDrive 0x00
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 PxDATA
Table 28-5. GPIO Register Address Map (Continued)
Address Read Location Type Write Location Reset Value