wts701 Winbond Electronics Corp America, wts701 Datasheet - Page 27

• Manufacturer Part Number: wts701
• Description: Winbond Single-chip Text-to-speech Processor
• Manufacturer: Winbond Electronics Corp America

PWUP
Byte Sequence:
Description:
CONV
The convert command starts the text to speech conversion process. The convert command is followed
by ASCII text data. The device has a buffer of 256 bytes. When this buffer is full, the chip pulls the
R/ B line LOW and sets the BFUL bit in the status word indicating that the WTS701 buffer manager is
in the buffer full condition. The WTS701 remains in the buffer full condition until the input buffer has
been emptied of half the buffer space (128 bytes). When the buffer is full, the Host may do one of
three things:
1. The Host may end the command at that point, then poll the BFUL bit of the SPI status register until
2. The Host may also continue the command (keep SS LOW) and wait for the R/ B pin to go HIGH.
3. The device may also be configured such that it will generate an interrupt to the host when the buffer
During conversion, the Convert Count Register is updated as each word has been spoken. This
register is cleared to zero at power up, and at the beginning of a new conversion process after one
has been terminated.
A convert command is terminated in several ways:
it is clear, and then send new CONV commands with the additional ASCII text data.
As each word is processed by the WTS701, space will become free in the buffer and the R/ B pin
will go HIGH until it is full again.
threshold (set by RCOM command) has been crossed. (See
to fill the buffer then wait for the Interrupt to send the additional data.
x
x
x
Send a finish command (FIN) indicating that the host has finished sending data. In this case,
the device finishes converting the text buffer, then stops and enters a wait state.
The conversion process will also stop when the EOT (^D, ASCII 0x1A, UNICODE/Big5 0x00
0x1A) character is part of the input text. When the device detects the EOT character, it will
continue the conversion process until the buffer is emptied and the final word spoken. Then it
will stop and enter the wait state.
The finish word command (FINW) will cause the WTS701 device to finish the word currently
being spoken, then flush the buffers and enter the wait state.
Convert
Class
Host controller
WTS701
Wake up the WTS701 processor to IDLE state.
0
Type
Status Byte 0
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0x02
I
Status Byte 1
Tables 3
Publication Release Date: May 2003
0x00
and 4) This allows the host
WTS701
Revision 3.09