ISD2540 datasheet(12/42 Pages) WINBOND

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ISD2532/40/48/64

7.2.1. Operational Modes Description

The Operational Modes can be used in conjunction with a microcontroller, or they can be hardwired 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 is 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 final message. When this Operational

Mode is configured, messages recorded sequentially are played back as one continuous message.

M2 – Unused

When Operational Modes are selected, the M2 pin should be LOW.

M3 – Message Looping

The M3 Operational Mode allows for the automatic, continuously repeated playback of the message

located at the beginning of the address space. A message can completely fill the ISD2500 device and

will loop from beginning to end without OVF going LOW.

M4 – Consecutive Addressing

During normal operation, the address pointer will reset when a message is played through an EOM

marker. The M4 Operational Mode inhibits the address pointer reset on EOM , allowing messages to

be played back consecutively.

M5 - CE -Level Activated

The default mode for ISD2500 devices is for CE to be edge-activated on playback and level-

activated on record. The M5 Operational Mode causes the CE pin to be interpreted as level-

activated as opposed to edge-activated during playback. This is especially useful for terminating

playback operations using the CE signal. In this mode, CE LOW begins a playback cycle, at the

beginning of the device memory. The playback cycle continues as long as CE is held LOW. When

goes HIGH, playback will immediately end. A new CE LOW will restart the message from the

beginning unless M4 is also HIGH.

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