YMU757B Datasheet, PDF (27/43 Pages) YAMAHA CORPORATION – MA-1C

YMU757B
Explains about each status
Digital Power ON Ready
It is the condition before starting a digital power supply.
Hardware Reset
The digital power supply has been turned on. Immediately after it has turned on, always enter the hardware
resetting data.
Analog Power ON Ready
It is the condition before starting a analog power supply. Turn on the analog power supply after the digital
section has been initialized.
Analog Power Down mode
It is the state that the consumption electric power of the analog part is minimum.
After the analog power supply has been turned on, the entire analog section is in the power down state. In order
to proceed to the next step Initialized state, use the procedure described on page 21. The power of the analog
section has been reduced. The power consumption of the analog section can be reduced.
Be sure to take the procedure to reduce the power of the analog section from the initialized state. (That is, each
volume must be set to "MUITE".)
It is possible to select the point where the power is reduced depending on the use purpose. For the details, refer
to "Power-down sequence" on pages 20, 21 and 22.
To turn off the analog power supply, always take the necessary procedure from this state.
Initialized
Becomes this state when it comes out of the power down mode of the analog part, the digital part.
And, move to the power down mode from this state.
STOP
The volume muting function has been cancelled and the timbre data settings have been completed. In this state,
FIFO is empty. This state is restored when the melody reproduction is stopped.
Also, the procedure to reduce the power of the digital section can be taken from this state. This state will be
restored when the power-down function is cancelled.
PLAY Standby
Writing the musical score data into FIFO has been completed and ready for melody reproduction. Setting "1"
for the ST bit will set for the next PLAY mode. It is possible to take the procedure to reduce the power of the
digital section from this state. However, the STOP state will be restored after the power-down function is
cancelled.
PLAY
The melody is being reproduced. Setting “0” for the ST bit will set to the STOP mode. It is prohibited to
change the digital section from this mode to the power down mode. (It may cause noises to occur.)
Digital Power Down mode
The power of the digital section has been reduced. ("1" set for DP bit)
As clocks are not inputted inside of the LSI even when they are inputted to the CLK_I terminal, power
consumption of the digital section can be reduced. Before proceeding to this mode, set both HP volume and
FM volume to "MUTE".
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