ISD2560/75/90/120

Publication Release Date: May 2003

- 11 -

Revision 1.0

Programming

The ISD2500 series is also ideal for playback-only applications, where single or multiple messages

are referenced through buttons, switches, or a microcontroller. Once the desired message

configuration is created, duplicates can easily be generated via a gang programmer.

The ISD2500 series is designed with several built-in Operational Modes that provide maximum

functionality with minimum external components. These modes are described in details as below. The

Operational Modes are accessed via the address pins and mapped beyond the normal message

address range. When the two Most Significant Bits (MSB), A8 and A9, are HIGH, the remaining

address signals are interpreted as mode bits and not as address bits. Therefore, Operational Modes

and direct addressing are not compatible and cannot be used simultaneously.

There are two important considerations for using Operational Modes. First, all operations begin initially

at address 0 of its memory. Later operations can begin at other address locations, depending on the

Operational Mode(s) chosen. In addition, the address pointer is reset to 0 when the device is changed

from record to playback, playback to record (except M6 mode), or when a Power-Down cycle is

executed.

Second, Operational Modes are executed when CE goes LOW. This Operational Mode remains in

effect until the next LOW-going CE signal, at which point the current mode(s) are sampled and

executed.

TABLE 2: OPERATIONAL MODES

Mode

[1]

Function

Typical Use

Jointly Compatible

[2]

M0

Message cueing

Fast-forward through messages

M4, M5, M6

M1

Delete EOM markers

Position EOM marker at the end of

the last message

M3, M4, M5, M6

M2

Not applicable

Reserved

N/A

M3

Looping

Continuous playback from Address 0

M1, M5, M6

M4

Consecutive

addressing

Record/playback multiple

consecutive messages

M0, M1, M5

M5

CE level-activated

Allows message pausing

M0, M1, M3, M4

M6

Push-button control

Simplified device interface

M0, M1, M3

[1]

Besides mode pin needed to be “1”, A8 and A9 pin are also required to be “1” in order to enter into the related operational

mode.

[2]

Indicates additional Operational Modes which can be used simultaneously with the given mode.