APR6008 Aplus Integrated circuits Inc., APR6008 Datasheet - Page 7

• Manufacturer Part Number: APR6008
• Description: 8 Min. -- Recording & Playback Voice Ic
• Manufacturer: Aplus Integrated circuits Inc.

If you are using an external sample clock signal
you must also set the EXTCLK divider ratio. This
divider ratio is equal to N:1 where N is an integer
between 1 and 256, excluding 2.The N value
should be selected to satisfy the following equation
as closely as possible:
EXTCLK freq =(N)*(128)*(selected sampling frequency)
Example:
Suppose that 8.0 KHz sampling is desired.
Assume that the frequency of the signal present on
EXTCLK
Rounding up, N = 8
The Op Code Parameter bit stream, composed of
Bits [A9 - A2][A1 - A0], therefore becomes binary
[00001000][10].
The STOP Command causes the device to stop
the current operation.
The STOP_PWDN command causes the device to
Stop the current command and enter power down
mode.During power down the device consumes
significantly less power. The PWRUP command
must be used to force the device into power up
mode before any commands can be executed.
The SET_REC command instructs the device to
Begin recording at the sector address specified.
The device will continue to record until the end of
the current sector is reached. If no forthcoming
command has been received when the end of the
sector is reached the device will loop back to the
beginning of the same sector and overwrite the
previously recorded material. If the next command
is another SET_REC or REC command the device
will execute the command immediately following
the end of the current sector so that no audio
information is lost. For more information see the
section entitled Recording Audio Data.
The REC command instructs the device to begin
recording in the current sector. If no new command
is received before the device reaches the end of
the sector the device will automatically increment
to the next sequential sector and continue
recording. The device will continue to record in this
manner until the memory is exhausted or a STOP
or STOP_PWDN
command is received. For more information see
the section entitled Recording Audio Data.
= 8MHz.
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7
T he DIG_ERASE command erases all data
Contained in the sector specified. Erase should not
be done before recording voice signals into a
sector. Erase must be done before storing digital
data in a sector.
The DIG_WRITE command stores 3K bits of digital
Data in the specified sector. All 3K bits must be
written; no partial usage of the sector is possible.
The memory acts as a FIFO, the first data bit
shifted in will be the first data bit shifted out.
A sector must be erased using the DIG_ERASE
command EFORE data can be written to the sector.
For more information on storing digital data,see the
section entitled Writing Digital Data.
The DIG_READ command instructs the device to
retrieve digital data that was previously written to
the specified sector. The first bit shifted out is the
first bit that was written. The last bit shifted out is
the last bit that was written. For more information
on reading digital data see the section entitled
Reading Digital Data.
The SET_PLAY command instructs the device to
Begin playback at the specified sector. If no
Forthcoming command is received, or EOD bit
encountered, before the end of the sector is
reached the device will loop back to the beginning
of the same sector and continue playback with no
noticeable gap in the audio output. If the next
command is another SET_PLAY or PLAYcommand
the device will execute the commandimmediately
following the end of the current sector sothat no
gap in playback is present. For more information
see the section entitled Playing Back Audio Data.
The PLAY command instructs the device to begin
playback at the current sector. If no forthcoming
command is received, or EOD bit encountered,
before the device reaches the end of the sector the
device will automatically increment to the next
sequential sector and continue playing.
The device will continue to play in this manner until
the memory is exhausted or a STOP or
STOP_PWDN command is received. For more
information see the section entitled Playing Back
Audio Data.
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APR6008
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