isd1740a Winbond Electronics Corp America, isd1740a Datasheet - Page 15

• Manufacturer Part Number: isd1740a
• Description: Multi-message Single-chip Voice Record&playback Devices
• Manufacturer: Winbond Electronics Corp America

Confidential
b) If the device is in power-down state and the current location of the play pointer is the last
c) If the device is currently playing a message that is not the last one:
Triggering of the
and will be ignored.
7.1.4
Erasing individual message takes place only if the playback pointer is at either the first or the
last message. Erasing individual messages other than the first or last message is not
possible. However, global erase can be executed at any message location and will erase all
messages. These two erase modes are characterized as follows:
a) Individual Erase: Only the first or last messages can be individually erased. Pulsing
d) If the device is currently playing a message that is the last one:
message: the pointer will advance to the first message and, if present, SE2 is played. The
LED will flash twice.
x Playback is halted.
x The playback pointer is advanced one message.
x If present, SE1 is played.
x Playback of the next message begins.
x The LED flashes during this entire process.
x Playback is halted.
x The playback pointer is advanced to the first message.
x If present, SE2 is played.
x Playback of the first message begins.
x The LED flashes during this entire process.
pointer:
x If the device is idle and the playback pointer is currently pointing to the first message:
x If the device is idle and the playback pointer is currently pointing to the last message:
ERASE
o
o
o
o
o
o
Erase Operation
First message is erased.
SE2, if present, will be played and the LED will flash twice.
Playback pointer will be updated to point to the new first message (previously, the
second message).
Last message is erased.
SE2, if present, will be played and the LED will flash twice.
Playback pointer will be updated to point to the new last message (previously, the
second to last message).
Low performs actions dependent upon the current location of the playback
FWD
operation during an erase or record operation is an illegal operation
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Publication Release Date: March 28, 2005
ISD1700A SERIES
Revision A0