WM8803CDTSLASHV datasheet(29/45 Pages) WOLFSON

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WM8803

PP Rev 1.1 September 2003

CCB ADDRESSES

The address locations in Table 15 are those used to set the parameters, write data values and to

read data values from the WM8803 over the micro-controller interface.

The micro-controller interface data format conforms to that of the Sanyo-developed CCB serial bus

format. However, a three state circuit is adopted for the data output instead of the open drain circuit

used in CCB.

Data is input or output after input of the CCB address. See the I/O timing chart for details on the data

input and output timing.

R/W

CCB

ADDRESS

Function settings data 1

Write

0xE8

Function settings data 2

Write

0xE9

Function settings data 3

Write

0xEA

Interrupt data output

Read

0xEB

Fs value, CS data output

Read

0xEC

Sub-code Q data output

Read

0xED

Table 15 Register I/O Content and CCB Addresses

DATA WRITE PROCEDURE

The data input bit length is 16 bits.

After inputting data to one of the CCB addresses 0xE8 to 0xEA, set CE to the high level.

Input data is acquired on the rising edge of CL.

The bits marked “0” in the table are reserved bits. A value of 0 must be written to these bits.

DATA READ PROCEDURE

Read data is output from DO and goes to the high-impedance state when CE is low. Output starts on

the CE rising edge following the establishment of the output address by the CCB command on the DI

pin. After operation the DO pin is returned to the high-impedance state by setting CE low.

The number of data bits read out differs with the type of data read. Interrupt data has 8bits, the

channel status related data (0xEC) has 56bits, and the sub-code Q data (0xED) has 88bits. However,

it is not necessary to read out all the data. During readout it is possible to read data up to the point

when the CL clock is stopped and the CE pin is set low. For example, when reading the sub-code Q

data, if the CRC flags are read and the data is seen to be corrupted, there is no need to read the

data following.

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