WTS701MMSLASHT datasheet(43/77 Pages) WINBOND

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WTS701

Publication Release Date: May 2003

- 43 -

Revision 3.09

7.4.5 Initialization and Configuration

Configuration

After power-on or a Reset command (RST) the WTS701 processor can be configured for operation.

This involves initializing the internal configuration registers for the users requirements.

Table 11. Initialization Commnad Sequence

State

Command

Description

POWER DOWN

--------

State after power-on or RST command.

SCLC

Set clock configuration.

PWUP

Power up device.

IDLE

SCOM

Set up communication register to enable interrupts.

SCOD

Set up CODEC configuration (if used).

SAUD

Set up audio control register.

SVOL

Set the initial volume level.

SSPD

Set the initial speech output speed level.

SPTC

Set the initial speech pitch level.

7.4.6 Converting Text

After configuration, the WTS701 is ready for text-to-speech conversion. Because of the real-time

nature of speech, some form of flow control is necessary to inform the host system:

1. When the device is ready for more text data

2. When the device has finished converting text

3. When the device can release the audio interface

The CONVERT state is entered by sending a CONV command along with some textual data. The

WTS701 has an internal 256-byte buffer to accept text data. The R/ B signal (both the hardware line

and the status bit) will become active (LOW):

1. When the internal buffer is full

2. If the host sends data at a rate too fast for the WTS701 to process it to the internal buffer

When R/ B becomes active the user may:

1. Wait for the R/ B pin to return to the (HIGH) ready state

2. Terminate the SPI transaction until a later time and resend the data

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