WM8802SCFV datasheet(37/65 Pages) WOLFSON

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WM8802

PP Rev 1.1 April 2004

MICRO-CONTROLLER INTERFACE ( INT , CL, CE, DI, DO)

DESCRIPTION OF MICRO-CONTROLLER INTERFACE

INTERRUPT OUTPUT ( INT )

Interrupts are output when a change has occurred in the PLL lock status or output data information.

Interrupt output is determined by the register that selects the interrupt source, the INT pin that

outputs that state transition and the registers that store the interrupt source data.

When INT is set output High, the occurrence of an interrupt will set INT output Low. INT returns

High after interrupt Low as dictated by the INTOPF setting.

INTOPF can be set to hold the Low pulse for a certain period and then clear it (to High) or clear it at

the same time that the output register is read.

The interrupt sources can be selected from among the following items in Table 16. Multiple sources

can be selected at the same time with the contents of CCB address 0xE8 and command address

0x08. INT outputs the result of ORing (addition) the selected interrupt sources.

INT output = (selected source 1) + (selected source 2) + ... + (selected source n)

NO.

COMMAND NAME

DESCRIPTION

ERROR

Output when RERR pin status has changed

INDET

Output when input data pin status has changed (Oscillation

amplifier operation condition)

FSCHG

Output when input fs calculation result has changed. (Output

amplifier condition)

CSRNW

Output when channel status data of first 48 bits has changed

UNPCM

Output when AUDIO pin status has changed

PCRNW

Output when burst preamble Pc has been updated

SLIPO

Output when data is read twice during slave setting and missing

data is detected

EMPF

Output when emphasis information has changed

Table 16 Interrupt Source Setting Contents

The set interrupt source contents are saved to output registers DO8 to DO15 of CCB address 0xEA.

The status of the RERR and AUDIO pins is output when the read registers for source items 1 and 5

are read. Except for source items 1 and 5, other data is saved to the registers upon occurrence of an

interrupt source.

The oscillation amplifier must be set to the continuous operation mode for source items 2 and 3 when

monitoring is performed even while the PLL is locked .

Following the occurrence of an interrupt from INT , the interrupt is cleared at the same time that the

output registers 0xEA is read.

In the interrupt Low pulse output mode the INT pulse width is between 1/2fs and 3/2fs for one

interrupt pulse.

CCB FORMAT

Function settings as well as information writing and reading are performed by the micro-controller

interface.

The data format of the micro-controller interface conforms to Sanyo's original serial bus format

(CCB). Tri-state instead of open-drain is employed for the data output format.

Data input/output is performed following CCB address input. See the input/output timing chart

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