May 1988

9

Philips Semiconductors

Product specification

TDA8421

Sequence of data transmission

After a power-on reset all eight functions have to be adjusted with eight data transmissions. It is recommended that data

information for switch functions in CH1 are transmitted last because all functions have to be adjusted when the muting

is switched off. The sequence of transmission of other data information is not critical.

The order of data transmission is shown in Figures 4 and 5. The number of data transmissions is unrestricted but before

each data byte the module address MAD and the correct subaddress SAD is required.

Fig.4 Data transmission after a power-on reset.

Fig.5 Data transmission except after power-on reset.