CS9236-CQ View Datasheet(PDF) - Cirrus Logic
Part Name
Description
MFG CO.
'CS9236-CQ' PDF : 34 Pages View PDF
CS9236
Message Definitions
Channel Voice Messages
NOTE ON
9nH
kkH
n = MIDI channel number
kk = note number
vv = velocity
vvH
0 - FH (1 - 16)
00 - 7FH (0 - 127)
00 - 7FH (1 - 127)
The NOTE ON message is used to turn on a note for a specified MIDI channel. Note number 3CH (60) is Middle C. In the
CS9236, the NOTE ON velocity value may control several characteristics of the resulting sound. The velocity value is used
to scale the amplitude envelope for all of the instruments in the CS9236 according to the following formula:
Max_env = (constant) * 10 ^ ((127 - velocity_value) * (-0.00835)).
For certain instruments, the velocity value also affects characteristics such as low-pass filter cutoff frequency, allowing the
timbre of the instrument to change subtlety as a function of velocity. MIDI controllers/transmitters which are not velocity
sensitive should use velocity = 40H (64). A NOTE ON message with velocity = 00 is defined to be a NOTE OFF message
with NOTE OFF velocity of 40H (this allows long strings of NOTE ON and NOTE OFF events to be sent as data bytes only
using running status).
NOTE OFF
8nH
kkH
or
9nH
kkH
n = MIDI channel number
kk = note number
vv = velocity
vvH
00H
0 - FH (1 - 16)
00 - 7FH (0 - 127)
00 - 7FH (ignored)
The NOTE OFF message is used to turn off a note on a specified MIDI channel (this message triggers the “release” portion
of the note’s amplitude envelope, wherein the amplitude decays to zero). Note number 3CH (60) = Middle C. MIDI con-
trollers/transmitters which are not velocity sensitive should use velocity = 40H. The NOTE OFF velocity value is ignored
by the CS9236. A note can be turned off using the NOTE OFF message (status byte = 8nH) or using the NOTE ON message
(9nH) with velocity = 00. The NOTE ON message with velocity = 00 is defined to be a NOTE OFF message with NOTE
OFF velocity of 40H (this allows long strings of NOTE ON and NOTE OFF events to be sent as data bytes only using running
status). The DAMPER PEDAL (Sustain) ON (MIDI Controller 64) takes priority over the NOTE OFF and ALL NOTES
OFF messages: the NOTE OFF or ALL NOTES OFF messages are recognized, but not acted on until the DAMPER PEDAL
is released (OFF). The SOSTENUTO PEDAL (MIDI Controller 66) ON takes priority over the NOTE OFF and ALL
NOTES OFF messages in a similar way, with the exception that SOSTENUTO only affects notes which were already active
at the time that SOSTENUTO was switched from OFF to ON (See description of DAMPER PEDAL and SOSTENUTO mes-
sages).
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DS214PP11
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