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WM8802
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
1
ERROR
Output when RERR pin status has changed
Output when input data pin status has changed (Oscillation
amplifier operation condition)
2
3
INDET
Output when input fs calculation result has changed. (Output
amplifier condition)
FSCHG
4
5
6
CSRNW
UNPCM
PCRNW
Output when channel status data of first 48 bits has changed
Output when AUDIO pin status has changed
Output when burst preamble Pc has been updated
Output when data is read twice during slave setting and missing
data is detected
7
8
SLIPO
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
PP Rev 1.1 April 2004
37
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WOLFSON [ WOLFSON MICROELECTRONICS PLC ]
