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MSM9802 데이터시트(PDF) 15 Page - OKI electronic componets

부품명 MSM9802
상세설명  Voice Synthesis IC with Built-in Mask ROM
PDF  52 Pages
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제조업체  OKI [OKI electronic componets]
홈페이지  http://www.oki.com
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MSM9802 데이터시트(HTML) 15 Page - OKI electronic componets

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MSM9802/03/05-xxx
¡ Semiconductor
If playback is attempted at an unused address in the phrases, AOUT goes to 1/2 IAOUT and
playback does not occur. Figure 3.2 shows the timing.
Figure 3.2 Timing when Playback is Attempted at an Unused Phrase Address
In the SW input interface, no phrase is triggered when SW2 to SW0 are all set to "0". Therefore,
when the circuit consists of a diode matrices that use push-button switches, the maximum
playback phrases are 56 phrases.
A2-A0 (I)
SW2-SW1 (I) "L"
SW0 (I)
BUSY (O)
AOUT (O)
Oscillation start
3.2 Random playback function
The random playback function randomly generates 15 different addresses corresponding to the
four bits of the addresses of A0 and SW2-SW0 (except ALL "L") on the IC, after which playback
commences.
Therefore, any input to A0 and SW2 to SW0 pins from external control is invalid. Hold these 4
pins either "H" or "L" level. SW2 to SW0 pins may be held open as they have internal pull-down
resistor.
Playback may not occur if all the 15 addresses have not been assigned a phrase. Care must be
taken when creating ROM data.
For example, when four phrases, "sunny", "rainy", "cloudy", and "snowy", are to be played
randomly, set the phrases as shown in Table 3.1 in which a phrase is assigned to all the 15
addresses. The four phrases are then played back at random as shown below.
000
001
002
111
A2-A0
8 codes
¥
¥
(000)
001
002
111
SW2-SW0
7 codes
= 56 Phrases
= 56
Code Prohibited



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