APR6016 datasheet(13/24 Pages) APLUS

13 / 24 page

Preliminary

APR6016 Data Sheet

Voice Recording & Playback Device

Page 13

Revision 1.0

Playing Back Audio Data

When a SET_PLAY or PLAY command is issued the device

will begin sampling the data in the specified sector and pro-

duce a resultant output on the AUDOUT, ANAOUT-, and

ANAOUT+ pins. 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 14 shows a typical timing diagram and OpCode

sequence for a playback operation. The SET_PLAY com-

mand begins playback at the specified memory location after

Taplay time has passed. Some time later the low going edge

on the SAC pin alerts the host processor that half of the first

sector has been played back. The host processor responds

by issuing a PLAY command during the SAC low time. The

PLAY command instructs the APR6016to continue playback

of the sector immediately following the current sector. When

the first sector has been played back the device jumps to the

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

cate that the second sector is now being played. At this point

the host processor decides to issue a STOP command during

the next available SAC low time. The device follows the

STOP command and terminates playback after TSaplay. The

/BUSY pin indicates when actual playback is taking place.

Figure 14 Typical Playback Sequence

Handshaking signals

Several signals are included in the device that allow for hand-

shaking. These signals can simplify message management

significantly

depending

the

message

management

scheme used.

The /INT signal can be used to generate interrupts to the pro-

cessor when attention is required by the APR6016This pin is

normally high and goes low when an interrupt is requested.

An interrupt is generated whenever a EOD or Overflow

occurs.

The SAC signal is used to determine when the device is

nearing the end of the current memory segment during either

a record, play or forward operation. The SAC signal is in a

normally high state. The signal goes low after half the cur-

rently active segment has been played or recorded. The sig-

nal returns to a high state after the entire segment has been

played or recorded. The microprocessor should sense the

low edge of the SAC signal as an indicator that the next seg-

/CS

SCLK

Taplay

TSaplay

SET_PLAY

STOP

SAC

ANAOUT+

ANAOUT-

ANAOUT

/BUSY

Note: Command timing is not to scale

PLAY

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