WM8321 datasheet(36/253 Pages) WOLFSON

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WM8321

Production Data

PD, February 2012, Rev 4.0

11.4 POWER STATE INTERRUPTS

Power State transitions are associated with a number of Interrupt event flags. Transitions to

BACKUP, SLEEP, ON or OFF states are indicated by the Interrupt bits described in Table 4. Each of

these secondary interrupts triggers a primary Power State Interrupt, PS_INT (see Section 23). This

can be masked by setting the mask bit(s) as described in Table 4.

ADDRESS

BIT

LABEL

DESCRIPTION

R16402

(4012h)

Interrupt Status

PS_POR_EINT

Power On Reset interrupt

(Rising Edge triggered)

Note: Cleared when a ‘1’ is written.

PS_SLEEP_OFF_EINT

SLEEP or OFF interrupt (Power state

transition to SLEEP or OFF states)

(Rising Edge triggered)

Note: Cleared when a ‘1’ is written.

PS_ON_WAKE_EINT

ON or WAKE interrupt (Power state

transition to ON state)

(Rising Edge triggered)

Note: Cleared when a ‘1’ is written.

R16410

(401Ah)

Interrupt Status

2 Mask

IM_PS_POR_EINT

Interrupt mask.

0 = Do not mask interrupt.

1 = Mask interrupt.

Default value is 1 (masked)

IM_PS_SLEEP_OFF_EINT

Interrupt mask.

0 = Do not mask interrupt.

1 = Mask interrupt.

Default value is 1 (masked)

IM_PS_ON_WAKE_EINT

Interrupt mask.

0 = Do not mask interrupt.

1 = Mask interrupt.

Default value is 1 (masked)

Table 4 Power State Interrupts

11.5 POWER STATE GPIO INDICATION

The WM8321 can be configured to generate logic signals via GPIO pins to indicate the current Power

State. See Section 21 for details of configuring GPIO pins.

A GPIO pin configured as “ON state” output will be asserted when the WM8321 is in the ON state.

A GPIO pin configured as “SLEEP state” output will be asserted when the WM8321 is in the SLEEP

state.

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