Product Data Sheets
ISD2500 Series
1–85
1
cated in the table. It is possible to use multiple
operational modes simultaneously. Operational
Modes are sampled on each falling edge of CE,
and thus Operational Modes and direct addressing
are mutually exclusive.
OPERATIONAL MODES
The ISD2500 Series is designed with several built-
in operational modes that provide maximum func-
tionality with minimum additional components.
These are described in detail below. The opera-
tional modes use the address pins on the ISD2500
devices, but are mapped outside the valid address
range. When the two Most Significant Bits (MSBs)
are HIGH (A8 and A9 for the ISD2560/75/90/120
devices, and A7 and A8 for the
ISD2532/40/48/64*
devices), the remaining address signals are inter-
preted as mode bits and not as address bits.
Therefore, operational modes and direct address-
ing are not compatible and cannot be used
simultaneously.
There are two important considerations for using
operational modes. First, all operations begin ini-
tially at address 0, which is the beginning of the
ISD2500 address space. 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 and the two MSBs are HIGH. This
Operational Mode remains in effect until the next
LOW-going CE signal, at which point the current
address/mode levels are sampled and executed.
OPERATIONAL MODES DESCRIPTION
The Operational Modes can be used in conjunction
with a microcontroller, or they can be hard-wired 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 should be used for
NOTE: An asterisk (*) indicates additional operational modes which can be used simultaneously with the given mode.
Mode
Control
Function
Typical Use
Jointly Compatible*
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 address-
ing
Record/Play 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
OPERATIONAL MODES TABLE
* Advance information: ISD2532/40/48/64 devices.
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