msm9802 Oki Semiconductor, msm9802 Datasheet - Page 33

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

4. Generating Pseudo-BUSY Signal through NAR Pin
If the application in use requires a BUSY signal when this IC is used in microcontroller interface mode, a
pseudo-BUSY signal can be generated through the NAR pin by controlling signal timing, as shown below.
When edit ROM is not used
When edit ROM is used
OKI Semiconductor
(Pseudo-BUSY)
(Pseudo-BUSY)
AOUT
I5-I0
NAR
AOUT
ST
I5 -I0
NAR
ST
(Phrases 1 + 2+3)
01(Phrase 1)
01
t
t
DAR
DAR
02(Phrase 2)
Phrase 1
30 µ s or more
Phrase 1
30 µ s or more
03(Phrase 3)
02(Silence phrase of 32 ms or more)
t
NAB
30 µ s or more
Phrase 2
t
BLN
Phrase 2
04(Silence phrase of 32 ms or more)
t
Phrase 3
NAB
30 µ s or more
Phrase 3
t
BLN
Silence
phrase
Silence
phrase
t
t
NAB
MSM9802/03/05-xxx
NAB
FEDL9802-03-05-05
t
STB
t
STB
t
DAF
t
DAF
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