Isd1916 – Rainbow Electronics ISD1916 User Manual

Page 13

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ISD1916

Publication Release Date: September 11, 2007

- 13 -

Revision 0

LED

Mic+/-

or AnaIn

PlayE

SP+

SP-

REC

<S3:S0>
<E3:E0>

Norm/Mode

T

Deb

T

AHold

T

ASet

T

Settle1

T

Deb

T

EOM

T

Settle3

6.1.5. XCLK Feature

• When precision sampling frequency is required, external clock mode can be activated by setting

XCLK

to Low. Under such condition, the resistor at Rosc pin must be removed and the external clock signal
must be applied to the Rosc pin. These conditions must be satisfied prior to any operations.

• However, when internal clock is used,

XCLK

must be linked to High.

• The external clock frequencies required for various sampling frequencies are listed in below table.

Sampling Freq [kHz]

12

8

6.4

5.3

4

XCLK

[MHz]

3.072 2.048 1.638 1.356 1.024

6.2.

D

IRECT

T

RIGGER

(

MODE

)

O

PERATION

• The direct trigger is selected by the

MODE

pin. Once chosen, the supply voltage must be reset to

allow the device to construct itself to the appropriate configuration by re-defining the function on the
related control pins. Also, the mode change is only allowed while the device is in power down state and
inhibited during an operation is in progress.

• Once direct trigger is activated,

FMC1

,

FMC2

&

FMC3

are utilized to select various (1 to 8) fixed

message configurations

[1]

. Pending upon the arrangement on

FMC1

,

FMC2

&

FMC3

, each divided

message has approximate equal length of duration, which is related to the number of rows assigned as
in below table.

• The record or playback operation is pre-defined by the

/P

R

pin. Setting this pin to Low allows record

operation while setting it to High enables playback operation.

• Each message can be randomly accessed via its message control pin (

M1

~

M8

) and the desired

operations are facilitated accordingly. Non-configured pins are automatically disabled and must be
floated.

Notes:

[1]

: Number of fixed message arrangement with respect to

FMC1

,

FMC2

&

FMC3

.

FMC3

FMC2

FMC1

# of fixed messages

[1]

0 0 0

1

0 0 1

2

0 1 0

3

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