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Description of the Command Codes
3-26
15) After the level 1 parameter nibble has been latched, the MSP53C691
again pulls INRDY low to get ready to receive the FM data. The master
must start sending the FM data in response to each lowering of INRDY.
Note:
The master must send the exact number of FM data promised to the
MSP53C691.
Most Significant
DATA LINES
DATA4
DATA3
DATA2
DATA1
DATA0
1
X
X
X
X
First nibble sent
1
X
X
X
X
Second through X nibbles sent
Least Significant
1
X
X
X
X
Last nibble sent
16) After all the promised number of FM data has been sent, the MSP53C691
again pulls INRDY low and waits for a command or CELP/MELP data from
the master. The master can send a valid command to the MSP53C691 (if
it is desired) or send CELP/MELP data. If a valid command is to be sent,
ensure that the DATA4 line is low while sending the command nibbles over
the DATA0–DATA3 lines. When the MSP53C691 needs more FM data, it
pulls OUTRDY low and the process of step 7 is repeated.
Note:
If the master starts sending a command, it must send all the nibbles of the
command back to back before starting to send CELP/MELP data or respond-
ing to an FM request.
17) If the master has sent the last nibble of a file to the MSP53C691 buffer,
then it can send dummy commands (0x00) in response to INRDY low if it
is not servicing an FM request or does not have any valid commands to
send.
Note:
If the master wishes to speak another phrase, it must wait to finish the current
phrase. As mentioned earlier, the master can send dummy commands
(0x00) if it not servicing an FM request or sending valid commands.
18) When the MSP53C691 finishes speaking a phrase, it pulls OUTRDY low
to send a nibble to the master. The master must read the nibble. The
MSP53C691 pulls OUTRDY low three more times sending a total of four
nibbles (0, 0, 5, and 4) to the master if the MSP53C691 has successfully
finished speaking the phrase.
19) If the master wishes to speak another phrase at this point, it must send the
command header 0x4 to the slave.
Summary of Contents for MSP53C691
Page 1: ...MSP53C691 Speech Synthesizer December 2000 MSDS Speech User s Guide SPSU020 ...
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