msm9802 Oki Semiconductor, msm9802 Datasheet - Page 17

• Manufacturer Part Number: msm9802
• Description: Voice Synthesis Ic With Built-in Mask Rom
• Manufacturer: Oki Semiconductor

For a random address, 15 phrases can be set for each logical condition of addresses A2 and A1 (i.e., “00”, “01”,
“10”, and “11”).
In random playback, the four logic states (“000000”, “010000”, “100000” and “110000”) in user-specified phrases
cannot be used. Take it into consideration when creating ROM data.
A random address is set by the “H” level time of the RND pin, so if the same pulse width is input by
microcontroller, the random address fixed time becomes constant, and a random phrase may not be played under
these conditions. The random address fixed time must be inconsistent in order to produce random playback.
OKI Semiconductor
AOUT (O)
BUSY (O)
RND (I)
Figure 3.4 Timing when a Pulse is Input to the RND Pin During Random Playback
A2, A1
00
01
10
11
Oscillation start
Table 3.2 Random Playback Address
A0, SW2 to SW0
0001
0010
0011
0100
1111
0001
0010
0011
0100
1111
0001
0010
0011
0100
1111
0001
1111
Pulse input during this time period is invalid
Phrase (Sample)
Invalid pulse
MSM9802/03/05-xxx
Green
White
Black
Blue
Red
Out
Out
Out
Out
Out
Out
Hit
Hit
Hit
Hit
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