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Description of the Command Codes
3-31
MSP53C691 Software Description
6) The MSP53C691 pulls OUTRDY low again sending a total of four nibbles:
either 0, 0, 5, and 4 indicating the successful stopping of the speaking of
the phrase and the command, or 0, 0, 5, and 3 indicating the successful
stopping of FM and completion of the command. Once a phrase is
stopped, the master can restart another phrase by sending the command
4 followed by 6 (as described in the
Playing Mixed Mode In Four Bit
section) in response to lowering of INRDY by the MSP53C691 requesting
the command.
7) The MSP53C691 then pulls INRDY low waiting for another command from
the master.
3.5.6
Command Header 6—Adjust the Volume
The MSP53C691 has six levels of volume control from the highest to lowest.
The default is the highest volume. The volume can be changed at anytime
while speaking a phrase or FM or in mixed mode. The sequence of events for
sending the volume command is as follows:
1) The MSP53C691 pulls INRDY low to receive a command or CELP/MELP
data. The master sends the command header 0x6 for volume control.
DATA LINES
DATA4
DATA3
DATA2
DATA1
DATA0
0
0
1
1
0
2) When the command header is latched into the MSP53C691, the
MSP53C691 pulls INRDY low again requesting the level 1 parameter. The
master sends any value from 1 through 6 representing the desired volume
(1 being the lowest, 6 being the highest).
DATA LINES
FUNCTIONS
DATA4
DATA3
DATA2
DATA1
DATA0
FUNCTIONS
0
0
0
0
0
Level 1—Lowest volume x(0x0)
0
0
0
0
1
Level 2 volume x(0x1)
0
0
0
1
0
Level 3 volume x(0x2)
0
0
0
1
1
Level 4 volume x(0x3)
0
0
1
0
0
Level 5 volume x(0x4)
0
0
1
0
1
Level 6 volume x(0x5)
0
0
1
1
0
Level 7—Highest volume x(0x6)
3) After the level 1 parameter is received, the MSP53C691 adjusts the
volume and then pulls INRDY low, requesting more commands or speech
data.
Note:
Each level change in volume control represents 6 dB of volume difference.
Summary of Contents for MSP53C691
Page 1: ...MSP53C691 Speech Synthesizer December 2000 MSDS Speech User s Guide SPSU020 ...
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