Page 122
Epson Research and Development
Vancouver Design Center
S1D13706 Hardware Functional Specification
X31B-A-001-08 Issue Date: 01/11/13
8.3.8 General IO Pins Registers
Note
1
If CNF3 = 0 at RESET#, then all GPIO pins are configured as outputs only and this
register has no effect. This case allows the GPIO pins to be used by the HR-TFT/D-TFD
panel interfaces. For a summary of GPIO usage for HR-TFT/D-TFD, see Table 4-10:
“LCD Interface Pin Mapping,” on page 31.
2
The input functions of the GPIO pins are not enabled until REG[A9h] bit 7 is set to 1.
bit 6 GPIO6 Pin IO Configuration
When this bit = 0 (default), GPIO6 is configured as an input pin.
When this bit = 1, GPIO6 is configured as an output pin.
bit 5 GPIO5 Pin IO Configuration
When this bit = 0 (default), GPIO5 is configured as an input pin.
When this bit = 1, GPIO5 is configured as an output pin.
bit 4 GPIO4 Pin IO Configuration
When this bit = 0 (default), GPIO4 is configured as an input pin.
When this bit = 1, GPIO4 is configured as an output pin.
bit 3 GPIO3 Pin IO Configuration
When this bit = 0 (default), GPIO3 is configured as an input pin.
When this bit = 1, GPIO3 is configured as an output pin.
bit 2 GPIO2 Pin IO Configuration
When this bit = 0 (default), GPIO2 is configured as an input pin.
When this bit = 1, GPIO2 is configured as an output pin.
bit 1 GPIO1 Pin IO Configuration
When this bit = 0 (default), GPIO1 is configured as an input pin.
When this bit = 1, GPIO1 is configured as an output pin.
bit 0 GPIO0 Pin IO Configuration
When this bit = 0 (default), GPIO0 is configured as an input pin.
When this bit = 1, GPIO0 is configured as an output pin.
bit 7 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 (default is 0).
General Purpose IO Pins Configuration Register 0
REG[A8h] Read/Write
n/a
GPIO6 Pin IO
Configuration
GPIO5 Pin IO
Configuration
GPIO4 Pin IO
Configuration
GPIO3 Pin IO
Configuration
GPIO2 Pin IO
Configuration
GPIO1 Pin IO
Configuration
GPIO0 Pin IO
Configuration
76543210
General Purpose IO Pins Configuration Register 1
REG[A9h] Read/Write
GPIO Pin
Input Enable
n/a
7 6 5 4 3 2 1 0
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