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37 SOM-5786 User Manual

Appendix B Programming GPIO

4. GPIOIx Output Control Register - Index 10h.

5. GPIO2x Output Control Register - Index 20h.

Table B.4: Index 10h

Bit Name P/W PWR Description

7GP17JX

CTRL

RW VSB3V GPIO 17 output control. Set to 1 for output

function. Set to 0 for input function (default).

6GP16_O

CTRL

RW VSB3V GPIO 16 output control. Set to 1 for output

function. Set to 0 for input function (default).

2GP12JD

CTRL

RW VSB3V GPIO 12 output control. If this pin serves as

IRQ/SMI#. this bit has no effect. Set to 1 for

output function. Set to 0 for input function

(default).

1 GP11_O

CTRL

RW VSB3V GPIO 11 output control. Set to 1 for output

function. Set to 0 for input function

(default).mode can use REG 0x09 (bit5, 4) to

select LED frequency.

Table B.5: Index 20h

Bit Name P/W PWR Description

7 GP27_O

CTRL

RW VSB3V GPIO 27 output control. Set to 1 for output

function. Set to 0 for input function (default).

6 GP26_O

CTRL

RW VSB3V GPIO 26 output control. Set to 1 for output

function. Set to 0 for input function (default).

5 GP25_O

CTRL

RW VSB3V GPIO 25 output control. Set to 1 for output

function. Set to 0 for input function (default).

4 GP24_O

CTRL

RW VSB3V GPIO 24 output control. Set to 1 for output

function. Set to 0 for input function (default).

3 GP23_O

CTRL

RW VSB3V GPIO 23 output control. Set to 1 for output

function. Set to 0 for input function (default).

2 GP22_O

CTRL

RW VSB3V GPIO 22 output control. Set to 1 for output

function. Set to 0 for input function (default).

1 GP21_O

CTRL

RW VSB3V GPIO 21 output control. Set to 1 for output

function. Set to 0 for input function (default).

0 GP20_O

CTRL

RW VSB3V GPIO 20 output control. Set to 1 for output

function. Set to 0 for input function (default).