PRELIMINARY ISD1700 SERIES
Publication Release Date: Nov 6, 2008
- 24 -
Revision 1.31
o
Update the playback pointer to the new first message - previously the second
message (or new last message - originally the second to the last message).
•
If the device is in power down mode and the playback pointer is at any message other
than the first or last message, then the device will:
o
Not erase any message and flash LED three times with blinking period T
LS3
, if SE3
is not programmed.
o
If SE3 is programmed, simultaneously play SE3 and flash the LED three times.
The LED blinking period is determined by the recorded duration, T
SE3
, of SE3.
o
Not change to the playback pointer.
•
If the device is currently playing the first (or last) message,
o
Stops the playback operation.
o
Erases the message as scenario one of individual erase mentioned earlier.
•
If the device is currently playing any message other than the first or last message, then
the device will:
o
Stops the playback operation.
o
Behave like scenario two of individual erase mentioned above.
b)
Global Erase
: Level-triggering
ERASE
at Low for more than 2.5 seconds and holding it
continuously will initiate the Global Erase operation and deletes all messages, except the
Sound Effects (SEs). See the below figure for operation details. The device reacts
differently according to the current condition of the device.
•
If SEs are not programmed
o
The device will blink LED twice with blinking period T
LS2
once
ERASE
is triggered
to indicate the current message being erased if it is either the first or last one.
o
Or if current message is neither the first nor last one, LED will blink three times
with blinking period T
LS3
to show that current message is not erased.
o
If
ERASE
is kept Low constantly, the LED will be blinked seven times to indicate
all messages being erased. However, if
ERASE
is released before the first three
blinks of LED, then global erase operation will be abandoned. Otherwise, the
global erase operation will be performed. The estimated total period of blinking
seven times is defined as (3*T
LS1
+T
LS4
).
•
If SEs are programmed,
o
The device will play SE2 and flash the LED twice simultaneously once
ERASE
is
triggered to indicate the current message being erased if it is either the first or last
one.
o
Or if current message is neither the first nor last one, the device will play SE3 and
flash the LED three times simultaneously to indicate that current message is not
erased.
o
After
ERASE
continues to be held Low for 2.5 seconds or more, the device plays
SE1 three times with LED flashing simultaneously. This serves as a warning signal
that after playing SE1 three times, then global erase will be performed. However, if
ERASE
is released before the playback of the third SE1, then global erase
operation will be abandoned.
