
SOLOMON
Rev 1.3
10/2002
SSD1905
44
General Purpose IO Pins Configuration Register 1
7
6
REG[A9h]
Bit
5
4
3
2
1
0
GPIO Pin
Input
Enable
RW
0
0
0
0
0
0
0
0
Type
Reset
state
Bit 7
NA
0
NA
0
NA
0
NA
0
NA
0
NA
0
NA
0
GPIO Pin Input Enable
This bit is used to enable the input function of the GPIO pins. It must be changed to a 1
after power-on reset to enable the input function of the GPIO pins.
General Purpose IO Pins Status/Control Register 0
7
6
REG[ACh]
0
Bit
5
4
3
2
1
0
GPIO6 Pin
IO Status
RW
0
GPIO5 Pin
IO Status
RW
0
GPIO4 Pin
IO Status
RW
0
GPIO3 Pin
IO Status
RW
0
GPIO2 Pin
IO Status
RW
0
GPIO1 Pin
IO Status
RW
0
GPIO0 Pin
IO Status
RW
0
Type
Reset
state
Note
For information on GPIO pin mapping when HR-TFT panels are selected, see Table 5-2 : LCD Interface Pin
Descriptions.
Bit 6
GPIO6 Pin IO Status
When GPIO6 is configured as an output, writing a 1 to this bit drives GPIO6 high and
writing a 0 to this bit drives GPIO6 low.
NA
0
When GPIO6 is configured as an input, a read from this bit returns the status of
GPIO6.
GPIO5 Pin IO Status
When GPIO5 is configured as an output, writing a 1 to this bit drives GPIO5 high and
writing a 0 to this bit drives GPIO5 low.
Bit 5
When GPIO5 is configured as an input, a read from this bit returns the status of
GPIO5.
GPIO4 Pin IO Status
When GPIO4 is configured as an output, writing a 1 to this bit drives GPIO4 high and
writing a 0 to this bit drives GPIO4 low.
Bit 4
When GPIO4 is configured as an input, a read from this bit returns the status of
GPIO4.
GPIO3 Pin IO Status
When a HR-TFT panel is not selected (REG[10h] bits 1:0=00/01/11) and GPIO3 is
configured as an output, writing a 1 to this bit drives GPIO3 high and writing a 0 to this
bit drives GPIO3 low.
Bit 3
When a HR-TFT panel is not selected (REG[10h] bits 1:0=00/01/11) and GPIO3 is
configured as an input, a read from this bit returns the status of GPIO3.
When a HR-TFT panel is enabled (REG[10h] bits 1:0 = 10), the HR-TFT signal SPL
signal is enabled whatever the value of this bit.