APR6016 datasheet(12/24 Pages) APLUS

12 / 24 page

Preliminary

APR6016 Data Sheet

Page 12

Voice Recording & Playback Device

Revision 1.0

Recording Audio Data

When a SET_REC or REC command is issued the device will

begin sampling and storing the data present on ANAIN+ and

ANAIN- to the specified sector. After half the sector is used

the SAC pin will drop low to indicate that a new command can

be accepted. The device will accept commands as long as

the SAC pin remains low. Any command received after the

SAC returns high will be queued up and executed during the

next SAC cycle.

Figure 13 shows a typical timing diagram and OpCode

sequence for a recording operation. In this example the

SET_REC command begins recording at the specified mem-

ory location after Tarec time has passed. Some time later the

low going edge on the SAC pin alerts the host processor that

the first sector is nearly full. The host processor responds by

issuing a REC command before the SAC pin returns high.

The REC command instructs the APR6016 to continue

recording in the sector immediately following the current sec-

tor. When the first sector is full the device automatically jumps

to the next sector and returns the SAC signal to a high state

to indicate that the second sector is now being used. At this

point the host processor decides to issue a STOP command

during the next SAC cycle. The device follows the STOP

command and terminates recording after TSarec.The /BUSY

pin indicates when actual recording is taking place.

Figure 13 Typical Recording Sequence

/CS

SCLK

Tarec

TSarec

SET_REC

STOP

SAC

ANAIN+

ANAIN-

/BUSY

REC

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