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ML63326 User's Manual
Chapter 13 Voice Synthesis
13
13.6 Operation of the Voice Synthesis Section
The voice synthesis section has the functions of voice, melody, and buzzer outputs.
13.6.1 Description of Pins Related to Voice Synthesis
The DACOUT pin is the output pin of the 12-bit D/A converter, and the AOUT pin is the output
pin of the amplifier whose input is the output of the 12-bit D/A converter. Both these pins are
used for the output of voice as well as melody/buzzer sounds.
At a system reset, the DACOUT pin will be at the AV
DD
level and the AOUT pin will be at the
V
SS
level.
The SPEN pin is the enable input pin for the amplifier which is intended for driving a
piezoelectric speaker. When not using this amplifier, leave this SPEN pin open or tie it to
GND. When using this amplifier, setting this pin to a "H" level only when the output is being
made will reduce the supply current.
The SPIN pin is the input pin for the amplifier which is intended for driving a piezoelectric
speaker. Connect this pin to GND when this amplifier is not used.
The SP(–) pin is the negative side output pin for driving a piezoelectric speaker, and the SP(+)
pin is the positive side output pin. Both pins will be at the V
SS
level at a system reset.
The MD/MDB pins are used for outputting the melody/buzzer output of the voice synthesis
section or of the microcontroller section. At a system reset, both these outputs will be at a
"L" level, and when the melody/buzzer output state is entered, the MDB pin outputs the
opposite level of the MD pin.
The BUSYB pin normally outputs a "H" level (V
DD
). It outputs a "L" level (0 V) when the voice
synthesis section is in the output state.
The ENVOICE pin is the pin that outputs the level of PC1 (bit 1 of PCD), and is used for the
RESET signal of the voice synthesis section. This pin will be at a "L" level at a system reset
thereby putting the voice synthesis section in the reset state, and the voice synthesis section
goes into the enabled state when this pin is set to a "H" level (V
DD
).
The V
REF
pin is the volume control function input pin that changes the amplitude of the output
at DACOUT. When this pin is in the open condition, the 1/5 AV
DD
voltage appears at this pin.
Leave this pin open when not using the volume control function.
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