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12
AXB-MIDI MIDI Interface
The following table lists and describes System Common messages:
Channel Voice Messages (Cont.)
Status (D7---D0) Data Bytes (D7---D0) Description
1100nnnn • 0ppppppp • Program Change.
• This message sent when the patch number changes.
• (ppppppp) is the new program number.
1101nnnn • 0vvvvvvv • Channel Pressure (After-touch).
• This message is most often sent by pressing down on the
key after it "bottoms out". This message is different from
polyphonic after-touch. Use this message to send the single
greatest pressure value (of all the current depressed keys).
• (vvvvvvv) is the pressure value.
1110nnnn • 0lllllll
• 0mmmmmmm
• Pitch Wheel Change.
• This message is sent to indicate a change in the pitch wheel.
The pitch wheel is measured by a fourteen bit value. Center
(no pitch change) is 2000H. Sensitivity is a function of the
transmitter.
• (llllll) are the least significant 7 bits. (mmmmmm) are the
most significant 7 bits.
System Common Messages
Status (D7---D0) Data Bytes (D7---D0) Description
11110000 • 0iiiiiii
• 0ddddddd
..
..
• 0ddddddd
• 11110111
• System Exclusive.
• This message makes up for all that MIDI doesn't support.
(iiiiiii) is usually a seven-bit Manufacturer's I.D. code. If the
synthesizer recognizes the I.D. code as its own, it will listen
to the rest of the message (ddddddd). Otherwise, the
message will be ignored. System Exclusive is used to send
bulk dumps such as patch parameters and other non-spec
data. (Note: Real-Time messages ONLY may be interleaved
with a System Exclusive.)
• This message also is used for extensions called Universal
Exclusive Messages.
11110001 • Undefined. (Reserved).
11110010 • 0lllllll
• 0mmmmmmm
• Song Position Pointer.
• This is an internal 14 bit register that holds the number of
MIDI beats (1 beat=six MIDI clocks) since the start of the
song. l is the LSB, m the MSB.
11110011 • 0sssssss • Song Select.
• The Song Select specifies which sequence or song is to be
played.
11110100 • Undefined. (Reserved).
11110101 • Undefined. (Reserved).
11110110 • Tune Request.
• Upon receiving a Tune Request, all analog synthesizers
should tune their oscillators.
11110111 • End of Exclusive.
• Used to terminate a System Exclusive dump (see above).