Texas Instruments MSP53C391, User Manual

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FM Synthesis Format and Commands
B-7 FM Synthesis
B.2.10 Command Summary
Table B–1 summarizes the several valid commands.
Table B–1. Command Summary
Command and Format Description
Music Notes: Note: Is the music note that can range form C0 to C6
Format:
Note,TimeValue,Duration,Velocity
TimeValue: Total length of the note. n4 is 1/4 note.
Example: C1, n4, n4, 127 Duration: Length of tone generate
Velocity: Note volume from 0 to 127
Tempo control the speed of music: TEMPO: Tempo command. Set the song tempo in
channel 1 ONLY.
Format: TEMPO,BPM,TimeSig,EnvelopeLen BPM: Beats per minutes.
Example: TEMPO,BPM116,TS44,ENVOK TimeSig: Beats per measure. TS44 sets the time
signature to 4/4 time.
EnvelopLen: Envelop time. ENVOK sets the envelope
length to normal.
Tempo control for channel 2:
Format: TEMPOSYNC
Example: TEMPOSYNC
TEMPOSYNC: Use in channel 2 only. It must be
placed at the same bar # as the channel 1 TEMPO
command. This is to ensure that the Tempo change is
synchronous, with both channels changing at the
same time.
Load Timbre into each channel:
Format: LOADTIMBRE,XX,XX.........,XX
Example: LOADTIMBRE, 21 bytes Parameters
LOADTIMBRE: Load new timbre (instrument) parame-
ters.
Parameters: Contains 21 bytes that define a musical
instrument.
Transpose:
Format: ATRNS, NUM
Example: ATRNS,–12
(–12 = Transpose Down an Octave)
ATRANS: Transpose command.
NUM: Set the channel’s transpose to a signed offset.
Transpose:
Format: RTRNS,NUM
Example: RTRNS,7
(Add 7 Semitones to the channel’s transpose off-
set)
RTRNS: Transpose command.
NUM: Add a signed offset to the channel’s transpose
value.