WM8580 datasheet(64/97 Pages) WOLFSON

64 / 97 page

WM8580

Production Data

PD Rev 4.3 August 2007

INTERRUPT GENERATION (INT_N)

The hardware interrupot INT_N flag (active low) indicates that a change of status has occurred on

one or more of the UNLOCK, INVALID, TRANS_ERR, NON_AUDIO, CPY_N, DEEMPH, CSUD or

REC_FREQ flags. To determine which flag caused the interrupt, the Interrupt Status Register

(INTSTAT) should be read when INT_N is asserted. INVALID, TRANS_ERR and CSUD generate an

interrupt when the flag transitions from low to high. UNLOCK, NON_AUDIO, CPY_N, DEEMPH and

REC_FREQ will generate an interrupt on any change in status. INT_N will remain asserted until it is

cleared by reading the interrupt status register. If INVALID, TRANS_ERR or CSUD are still active

when the interrupt status register is read, INT_N remains asserted.

Table 62 Interrupt Status Register

Where the INT_N has been asserted by an update signal (UPD_UNLOCK, UPD_NON_AUDIO,

UPD_CPY_N, UPD_DEEMPH, UPD_REC_FREQ) the S/PDIF Status Register can be read to reveal

the satus of the flag. See Table 63.

ADDRESS

BIT

LABEL

DEFAULT

DESCRIPTION

UPD_UNLOCK

UNLOCK flag update signal

0 = INT_N not caused by update to UNLOCK flag

1 = INT_N caused by update to 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

CSUD flag 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 update to NON_AUDIO flag

1 = INT_N caused by update to NON_AUDIO flag

UPD_CPY_N

CPY_N update signal

0 = INT_N not caused by update to CPY_N flag

1 = INT_N caused by update to CPY_N flag

UPD_DEEMPH

DEEMPH update signal

0 = INT_N not caused by update to DEEMPH flag

1 = INT_N caused by update to DEEMPH flag

R43

INTSTAT

2Bh

(read-only)

UPD_REC_FREQ

REC_FREQ update signal

0 = INT_N not caused by update to REC_FREQ flag

1 = INT_N caused by update to REC_FREQ flag

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