ml2215 Oki Semiconductor, ml2215 Datasheet - Page 13

• Manufacturer Part Number: ml2215
• Description: Speech Synthesizer Plus Music Lsi With On-chip 3 Mbit Mask Rom
• Manufacturer: Oki Semiconductor

You must input the external clock to the CLK pin. Otherwise, serial data input cannot be acquired internally,
regardless t
As shown in Figure 4.2, re-inputting the Start-bit before the SI’s 8th clock cancels the preceding serial data entry,
and 8-clock data following the Start-bit is taken as valid data.
4.2 3-pin Controlled Serial Input Interface
3-pin interfacing uses the SD, SI and ST pins to control interfacing.
When 3-pin interfacing is selected, input to the SD and SI pins is enabled while the ST pin being held “L”. Serial
data input to the SD pin is acquired to the internal register in synchronization with the falling edge of the SI’s 8th
clock as an 8-bit phrase code for a user-defined phrase. If the ST pin is brought back to “H” before the SI’s 8th
clock, the preceding entry is cancelled, and 8-clock data after the ST pin being brought back to “L” again is taken
as valid data.
1 Semiconductor
BUSY
NAR
SD
SI
SDST
BUSY
ST
SD
SI
NAR
1 s or t
t
SDST
SDST
< 1 s.
Figure 4.2 Timing Chart of Serial Input
Figure 4.3 Timing Chart of Serial Input
t
SDST
FEDL2215-01
ML2215
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