APR6016 datasheet(7/24 Pages) APLUS

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Preliminary

APR6016 Data Sheet

Voice Recording & Playback Device

Page 7

Revision 1.0

to N:1 where N is an integer between 1 and 256, excluding 2.

The N value should be selected to satisfy the following equa-

tion 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 = 8MHz.

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 com-

mand 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 automati-

cally 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.

The 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

BEFORE data can be written to the sector. For more informa-

tion 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 infor-

mation on reading digital data see the section entitled Read-

ing Digital Data.

The SET_PLAY command instructs the device to begin play-

back at the specified sector. If no forthcoming command is

received, or EOD bit encountered, before the end of the sec-

tor 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 PLAY command the device will execute the command

immediately following the end of the current sector so that no

gap in playback is present. For more information see the sec-

tion 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 con-

tinue 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.

8000000

128 8000

()

--------------------------

7.8125

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