WM8816-MICRO-EV1M データシートの表示（PDF） - Wolfson Microelectronics plc

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WM8816-MICRO-EV1M

WM8816 Micro-Controller Board User Handbook

Wolfson Microelectronics plc 

USING THE 6 CHANNEL VOLUME CONTROL

WM8816-MICRO-EV1M

The keys marked “Front”, “Rear” and “Centre / LFE” select which of the three WM8816_EV1B is

currently active.

When the “Front” key is pressed then the WM8816_EV1B that is controlling the Front Stereo Pair of

speakers is made active. Any user inputs to the keypad will be applied to this Evaluation Board only.

This is indicated by LED D13 being illuminated.

If the “Rear” key is pressed then the second WM8816_EV1B, which controls the Rear Stereo Pair of

speakers, is made active. Any user inputs to the keypad will now be applied to this Evaluation Board

only. LED D12 will be illuminated

If the “Centre / LFE” key is pressed then the third WM8816_EV1B, which controls the centre and LFE

speakers is made active. This third WM8816_EV1B differs from the others since the left channel

controls the Centre speaker and the right channel controls the LFE speaker. It is not a stereo pair of

speakers like the front and rear.

Pressing the “Centre / LFE” key once allows variable gain to be applied to the Centre speaker.

When the centre speaker is under control of the Micro-Controller board then LED D11 is illuminated.

Pressing the “Centre / LFE” key once more allows the Micro-Controller board to vary the volume of

the LFE speaker. When the LFE speaker is currently selected LED D15 will be illuminated.

Because the Centre and LFE are mono signals balance information can not be written to this third

WM8816_EV1B Evaluation Board. If a user attempts to use any of the balance keys when Centre or

LFE is selected then “------“ is output to the four digit display (U2 & U8).

In 6 Channel Mode the peak reference keys operate as before – except for the fact that data is

written to or read from the WM8816_EV1B which is currently active, as indicated by LEDS D13, D12,

D11, D15.

Pressing the Mute key will mute all 6-output speakers. Pressing the key again will un-mute all the

channels and restore them to their original state.

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Rev 1.1, December 2002

6

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