IS22C012

2

Integrated Silicon Solution, Inc. — 1-800-379-4774

ADVANCE INFORMATION VP010-0B

02/24/99

The entry of sections for each group is truly random and

without limitation. However, there is a limit in the total

number of entries for eight groups, which is 992 in the

IS22C012. It is acceptable to allocate all entries into only

one group or distribute out to other groups. It depends on

how many groups of messages are required.

Programmable Options

Groups in IS22C012 can have independent options. They

include:

•

Edge or Level trigger

•

Unholdable or Holdable trigger

•

Retriggerable or non-retriggerable

•

LED1, LED2, Busy, and Stop pulse are configurable

•

Four selections in playback frequency

Selections in Triggering

The IS22C012 can be triggered in different ways, Edge or

Level trigger, Holdable or Unholdable, Retriggerable or

Non-retriggerable. The combinations of the triggering op-

tions provide versatile playback.

By enabling Retrigger, the playback can be controlled in

Stop and Start mode. A trigger on any trigger pin will stop the

content message and start the next message immediately.

Selections in Playback Frequency

This option provides four choices for each group in frequency

which implies it is possible to have four different sampling

rates in one chip or one sample rate with a different playback

frequency. As a matter of fact, the available choices are also

dependent on the pullup resistor value at the OSC pin. For

example, if the fundamental frequency choice is F, it can

provide choices in x1, x1-1/2, x2, x3.

Selections in Output Buffer

There are three independent output pins, OUT1, OUT2, and

OUT3, available for several combinations of LED1, LED2,

Stop Pulse, and Busy Signal for each group. The following

table illustrates the four different combinations.

OUT1

OUT2

OUT3

1.

LED1

LED2

Busy

2.

STOP

LED1

LED2

3.

Busy

Stop

LED1

4.

LED2

Busy

Stop

LED1 and LED2 are complemented outputs flashing at

approximately a 3 Hz rate. Stop pulse (STOP) gives a 15 ms

positive pulse at the end of the playback for each Group with

option have or do not have the Stop pulse.

Busy is active high and Section dependent but not Group

dependent. Even if same section in different group may

have different output in Busy output. For instance, BUSY

can be high for Section 4 in Group 1 but low in Group 4.

BUSY can be used as a synchronous signal. During standby

mode all three outputs must be low.

Software Support

ISSI provides dedicated software to the customer. With this

tool, the customer can compose their own messages and

configure the chip to fit intor their applications very easily.