WM8991 datasheet(95/174 Pages) WOLFSON

95 / 174 page

Pre-Production

WM8991

PP, May 2008, Rev 3.1

The IRQ register (R18) is described in Table 55.

ADDRESS

BIT

LABEL

DEFAULT

DESCRIPTION

IRQ

(ro)

Read Only

IRQ Readback

(Allows polling of IRQ status)

TEMPOK

(rr)

Read or

Reset

Temperature OK status

Read-

0 = Device temperature NOT ok

1 = Device temperature ok

Write -

1 = Reset TEMPOK latch

MICSHRT

(rr)

Read or

Reset

MICBIAS short status

Read-

0 = MICBIAS ok

1 = MICBIAS shorted

Write-

1 = Reset MICSHRT latch

MICDET

(rr)

Read or

Reset

MICBIAS detect status

MICBIAS microphone detect Readback

Read-

0 = No Microphone detected

1 = Microphone detected

Write-

1 = Reset MICDET latch

PLL_LCK

(rr)

Read or

Reset

PLL Lock status

Read-

0 = PLL NOT locked

1 = PLL locked

Write-

1 = Reset PLL_LCK latch

R18 (12h)

7:0

GPIO_STATUS

[7:0]

(rr)

Read or

Reset

GPIO and GPI Input Pin Status

GPIO_STATUS[7] = GPI8 pin status

GPIO_STATUS[6] = GPI7 pin status

GPIO_STATUS[5] = GPIO6 status

GPIO_STATUS[4] = GPIO5 status

GPIO_STATUS[3] = GPIO4 status

GPIO_STATUS[2] = GPIO3 status

GPIO_STATUS[1] = GPIO2 status

GPIO_STATUS[0] = GPIO1 status

R23 (17h)

GPIO

Control (2)

IRQ_INV

(rw)

IRQ Invert

0 = IRQ output active high

1 = IRQ output active low

Table 55 GPIO Interrupt and Status Readback

WM8991 Datasheet(PDF) 95 Page - Wolfson Microelectronics plc

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