WTS701MFSLASHT datasheet(46/77 Pages) WINBOND

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WTS701

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Controlling Text Conversion

The WTS701 offers several features to control text conversion. The PAUS (Pause) and RES

(Resume) commands allow the host to pause and then continue speech output. The FINW command

allows the host to end a conversion after the next whole word is spoken. The ST (Stop) command will

terminate a conversion immediately – even mid-word. To allow more advanced control, the WTS701

allows the host to interrogate the byte count register, which keeps track of the position in the input

stream that is currently being spoken. If the host wishes to repeat a spoken word, it should:

1. Read the byte count register

2. Send a FINW or ST command

3. Wait for ICNV

4. Send a new CONV command resending the data starting at the desired number of bytes,

according to the repeated spoken words, prior to the count returned in the byte count

In a similar way a skip function could be implemented to skip ahead words or sentences.

7.5 SPI INTERFACE

The SPI interface consists of the 4-wire bus SS , SCLK, MOSI and MISO. In addition, flow control

protocols are implemented via the R/ B signal and/or the WTS701 Status register transmitted via

MOSI. The WTS701 processor also has the option to communicate with the host via interrupt services

requested by the interrupt request line. The timing and behavior of these signals is dependent upon

the command class being executed, i.e., commands with or without associated data. Additionally the

use of the R/ B hardware control line is not compulsory; rather the host can monitor the R/ B bit of

the status register to determine when data has been accepted. The status register also contains the

ICMD bit. This bit is set to indicate an SPI transaction has been ignored, indicating that the WTS701

processor is unable to service a new command. Asynchronous (Class 0) commands are always

accepted. For more information, refer to subsection 7.3.1 which describes the command classes.

7.5.1 SPI Transactions

SPI Transactions with the WTS701 are broken down into four classes and four basic types:

Type I - Single Word Transactions

Single word transactions are Class 0 or Class 1 commands that have no data to transmit or transmit

all required data in the command data byte. R/ B will never become active for these commands.

ICMD could be active for a Class 1 command if the WTS701 is still interpreting the previous

command.

WTS701MF/T Datasheet(PDF) 46 Page - Winbond