ml2216 Oki Semiconductor, ml2216 Datasheet - Page 29

• Manufacturer Part Number: ml2216
• Description: Oki Adpcm2 Algorithm-based Speech Synthesis Lsi
• Manufacturer: Oki Semiconductor

4. PDWN2 Command
PDWN2 command is used to take measures for the pop-noise from the command standby state (both NCR and
BUSY are “H”) and to shift the ML2216 to the power down state.
To resume speech synthesis processing after the ML2216 has shifted to the power down state, first input the PUP1,
or PUP2, command followed by the PLAY command.
After PDWN2 command input and the elapse of PDWN2 command processing time, the AOUT output changes
gradually in 64 ms from 1V level to GND level.
Speaker amplifier output stop operation After PDWN2 command input and after an elapse of the PDWN2command
processing time. At this time, SPP output will be in a “Hi-Z” state in order to prevent a pop noise.
All commands that will be input while the pop noise is being suppressed, are ignored. However, if RESET is input,
the ML2216 soon enters the power down state.
OKI Semiconductor
• command
0
status
REGO
AOUT
BUSY
XT·XT
·VBG
NCR
SPM
SCK
SPP
SG
CS
DI
0
Processing command
1
Command
standby
1
1V
1/2VDD
1/2VDD
Oscillating
−
−
Suppressing
pop noise
−
−
Power down
Oscillation
stopped
GND
GND
GND
GND
Hi-Z
ML2216/ML22P16
FEDL2216FULL-03
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