Product Data Sheets

ISD1000A Series

1–7

1

LOW-going CE signal, at which point the current

address/mode levels are sampled and executed.

NOTE

The two MSBs are on pins 9 and 10 for

each ISD1000A Series member.

OPERATIONAL MODES DESCRIPTION

The Operational Modes can be used in conjunc-

tion with a microcontroller, or they can be hard-

wired to provide the desired system operation.

M0 — Message Cueing

Message Cueing allows the user to skip through

messages, without knowing the actual physical

addresses of each message.

Each CE LOW

pulse causes the internal address pointer to skip

to the next message. This mode should be used

for Playback only, and is typically used with the

M4 Operational Mode.

M1 — Delete EOM Markers

The M1 Operational Mode allows sequentially

recorded messages to be combined into a single

message with only one EOM marker set at the end

of the combined message. When this operational

mode is configured, messages recorded sequen-

tially are played back as one continuous mes-

sage.

M2 — Used for Cascading

During playback, EOM goes LOW at array over-

flow only. Normal EOM pulses are turned off.

M3 — Message Looping

The M3 Operational Mode allows for the auto-

matic, continuously repeated playback of the

message located at the beginning of the address

ISD1000A device and loop.

M4 — Consecutive Addressing

During normal operations, the address pointer will

reset when a message is played through to an

EOM marker. The M4 Operational Mode inhibits

the address pointer reset on EOM, allowing mes-

sages to be played back consecutively.

M5 — CE Level Activated

The default mode for ISD1000A devices is for CE

to be edge-activated on Playback and level-acti-

vated on Record. The M5 Operational Mode

causes the CE pin to be interpreted as level-acti-

vated as opposed to edge-activated during Play-

back. This is specifically useful for terminating

Playback operations using the CE signal. In this

mode, CE LOW begins a Playback cycle at the

beginning of device memory.

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