WM8904ECSSLASHR datasheet(116/188 Pages) WOLFSON

116 / 188 page

WM8904

Pre-Production

PP, Rev 3.3, September 2012

116

GPIO2

The GPIO2 pin is configured using the register bits described in Table 76. By default, this pin is GPIO

input with pull-down resistor enabled.

ADDRESS

BIT

LABEL

DEFAULT

DESCRIPTION

R122 (7Ah)

GPIO

Control 2

GPIO2_PU

GPIO2 pull-up resistor enable

0 = pull-up disabled

1 = pull-up enabled

GPIO2_PD

GPIO2 pull-down resistor enable

0 = pull-down disabled

1 = pull-down enabled

3:0

GPIO2_SEL [3:0]

0000

GPIO2 Function Select

0000 = Input pin (default)

0001 = Clock output

(f=SYSCLK/OPCLKDIV)

0010 = Logic '0'

0011 = Logic '1'

0100 = IRQ

0101 = FLL Lock

0110 = Mic Detect

0111 = Mic Short

1000 = DMIC clock out

1001 = FLL Clock Output

1010 to 1111 = Reserved

Table 76 GPIO2 Control

GPIO3

The GPIO3 pin is configured using the register bits described in Table 77. By default, this pin is GPIO

input with pull-down resistor enabled.

ADDRESS

BIT

LABEL

DEFAULT

DESCRIPTION

R123 (7Bh)

GPIO

Control 3

GPIO3_PU

GPIO3 pull-up resistor enable

0 = pull-up disabled

1 = pull-up enabled

GPIO3_PD

GPIO3 pull-down resistor enable

0 = pull-down disabled

1 = pull-down enabled

3:0

GPIO3_SEL [3:0]

0000

GPIO3 Function Select

0000 = Input pin (default)

0001 = Clock output

(f=SYSCLK/OPCLKDIV)

0010 = Logic '0'

0011 = Logic '1'

0100 = IRQ

0101 = FLL Lock

0110 = Mic Detect

0111 = Mic Short

1000 = DMIC clock out

1001 = FLL Clock Output

1010 to 1111 = Reserved

Table 77 GPIO3 Control

WM8904ECS/R Datasheet(PDF) 116 Page - Wolfson Microelectronics plc

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