WM8804 datasheet(40/66 Pages) WOLFSON

40 / 66 page

WM8804

Production Data

PD Rev 4.1 September 2007

INTERRUPT GENERATION

The INT_N flag indicates that a change of status has occurred on one or more of the UNLOCK,

INVALID, TRANS_ERR, CSUD, NON_AUDIO, CPY_N, REC_FREQ or DEEMPH status flags. To

identify which flag caused the interrupt, the Interrupt Status Register (INTSTAT) must be read.

INVALID and TRANS_ERR are level sensitive interrupts. When these signals are high an interrupt

will be generated. The interrupt can be cleared by reading the interrupt status register, however, the

interrupt will re-assert if the signal is still high. CSUD and REC_FREQ will generate an interrupt on a

low to high transition and can be cleared by reading the interrupt status register. Once clear the

interrupt will not re-assert until another low to high transition occurs. NON_AUDIO, CPY_N, UNLOCK

and DEEMPH will generate an update signal on any change in flag status. The interrupt and update

signals are latched and will remain asserted until they are cleared by reading the Interrupt Status

ADDRESS

BIT

LABEL

DEFAULT

DESCRIPTION

UPD_UNLOCK

UNLOCK update signal

0 = INT_N not caused by a toggle of UNLOCK flag

1 = INT_N caused by a toggle of UNLOCK flag

INT_INVALID

INVALID flag interrupt signal

0 = INT_N not caused by INVALID flag

1 = INT_N caused by INVALID flag

INT_CSUD

INT_CSUD interrupt signal

0 = INT_N not caused by CSUD flag

1 = INT_N caused by CSUD flag

INT_TRANS_ERR

TRANS_ERR flag interrupt signal

0 = INT_N not caused by TRANS_ERR flag

1 = INT_N caused by TRANS_ERR flag

UPD_NON_AUDIO

NON_AUDIO update signal

0 = INT_N not caused by a toggle of AUDIO_N or PCM_N

flags

1 = INT_N caused by a toggle of AUDIO_N or PCM_N flags

UPD_CPY_N

CPY_N update signal

0 = INT_N not caused by assertion of CPY_N flag

1 = INT_N caused assertion of CPY_N flag

UPD_DEEMPH

DEEMPH update signal

0 = INT_N not caused by a toggle of DEEMPH flag

1 = INT_N caused by a toggle of DEEMPH flag

R11

INTSTAT

0Bh

(read-only)

UPD_REC_FREQ

REC_FREQ update signal

0 = INT_N not caused by assertion of REC_FREQ flag

1 = INT_N caused by assertion of REC_FREQ flag

Table 48 Interrupt Status Register

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