Description of the Command Codes
3-29
MSP53C691 Software Description
Most Significant
DATA LINES
DATA4
DATA3
DATA2
DATA1
DATA0
0
0
1
0
0
First command header sent
3) After receiving the command header, the MSP53C691 pulls INRDY low
again and waits for the level 1 parameter from the master.
4) The master must send 0x7 as the level 1 parameter to indicate the test
mode.
Most Significant
DATA LINES
DATA4
DATA3
DATA2
DATA1
DATA0
0
0
1
1
1
Level 1 parameter sent
5) The MSP53C691 interprets the command and initializes itself to get ready
to go to the test mode.
6) The MSP53C691 outputs a pure sine wave tone of 1 kHz frequency
through its DAC pins.
3.5.5
Command Header 5—Stop Speaking
The MSP53C691 can stop speaking at any time while speaking either
CELP/MELP only in four-bit mode, playing FM only in four-bit mode, or
speaking both CELP/MELP and FM in mixed mode.
The sequence of events for stopping speaking while playing CELP/MELP or
FM only is as follows:
1) The MSP53C691 pulls INRDY low while speaking a phrase requesting a
command, speech, or FM data.
2) The master sends the command header 0x5 to the MSP53C691. The
DATA/COMMAND line is pulled low while sending the header to indicate
a command.
DATA LINES
DATA4
DATA3
DATA2
DATA1
DATA0
0
0
1
0
1
Command header set
3) The MSP53C691 pulls INRDY low again requesting the level 1 command.
4) The master sends 1 as the level 1 command to the MSP53C691.
DATA LINES
DATA4
DATA3
DATA2
DATA1
DATA0
0
0
0
0
1
Level 1 command set
Summary of Contents for MSP53C691
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