ISD2540 datasheet(14/42 Pages) WINBOND

14 / 42 page

ISD2532/40/48/64

2. The P/ R pin is taken LOW.

3. The CE pin is pulsed LOW. Recording starts, EOM goes HIGH to indicate an

operation in progress.

4. When the CE pin is pulsed LOW. Recording pauses, EOM goes back LOW. The

internal address pointers are not cleared, but the EOM marker is stored in memory to

indicate as the message end. The P/ R pin may be taken HIGH at this time. Any

subsequent CE would start a playback at address 0.

5. The CE pin is pulsed LOW. Recording starts at the next address after the previous set

EOM

marker. EOM goes back HIGH.

[3]

6. When the recording sequences are finished, the final CE pulse LOW will end the last

record cycle, leaving a set EOM marker at the message end. Recording may also be

terminated by a HIGH level on PD, which will leave a set EOM marker.

Playback in Push-Button Mode

1. The PD pin should be LOW.

2. The P/ R pin is taken HIGH.

3. The CE pin is pulsed LOW. Playback starts, EOM goes HIGH to indicate an operation

in progress.

4. If the CE pin is pulsed LOW or an EOM marker is encountered during an operation,

the part will pause. The internal address pointers are not cleared, and EOM goes back

LOW. The P/ R pin may be changed at this time. A subsequent record operation would

not reset the address pointers and the recording would begin where playback ended.

is again pulsed LOW. Playback starts where it left off, with EOM going HIGH to

indicate an operation in progress.

6. Playback continues as in steps 4 and 5 until PD is pulsed HIGH or overflow occurs.

7. If in overflow, pulling CE LOW will reset the address pointer and start playback from the

beginning. After a PD pulse, the part is reset to address 0.

Note: Push-Button Mode can be used in conjunction with modes M0, M1, and M3.

[3]

If the M1 Operational Mode pin is also HIGH, the just previously written

EOM bit is erased, and recording starts at that

address.

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ISD2540 Datasheet(PDF) 14 Page - Winbond