E0C63B07
q
Melody Generator AC Characteristics
(Unless otherwise specified: V
DD
=3.0V, V
SS
=0V, Ta=25°C)
Characteristic
Symbol
Min.
Typ.
Condition
Max.
Unit
∗1
27.4
Play start MT minimum pulse width
t
ON1
mS
Frequency selection data set-up time
t
SCK
10
µS
Melody selection data set-up time
10
t
SMS
µS
Melody selection data hold time
10
t
HMS
"Melody change during play is impossible" option
µS
Play mode selection data set-up time
t
SPM
10
µS
Play start delay time
t
B
31.25
∗1
mS
Output inverting time
t
OUT
f
OSC1
=76.8, 153.6 kHz
mS
1.68
mS
f
OSC1
=32.768 kHz
1.96
Play suspension time (1)
0.0039
t
E1
Sec
1 beat
Play suspension time (2)
1 beat
t
E2
2 beats Sec
MT=0 minimum pulse width
1 beat
t
OFF
Sec
MT=1 minimum pulse width
1 beat
t
ON2
Sec
Melody changing time during play
0
t
MC
Note
"Melody change during play is possible" option
length at
change
∗1
The quantization error becomes smaller than the standard value about by synchronization with the external clock.
Therefore, actual time t is as follows: (Standard value - external clock 1 cycle ) < t < standard value)
Play start timing
MT
t
ON1
f
OSC1
CKSn
Clock frequency selection
t
SCK
Melody selection
t
SMS
t
HMS
MSn
PMn
Play mode selection
t
SPM
Play
t
B
Play control (MPLY register)
MOUT
t
OUT
Melody and play mode selections should be done
before starting the play (before setting the MT
register to "1"), though it is no problem if the set-
up time can be maintained.
Play stop timing
• Level hold play and One-shot C play
MT
• Start/stop control by MT
MT
t
OFF
t
ON2
MOUT
t
E1
MOUT
t
E2
Change of melody during playing
• When the mask option "possible to change" is selected
MSn (melody selection)
melody x
melody y
Play output
melody x
t
MC
first note in melody y
9
SEIKO [ SEIKO EPSON CORPORATION ]
