ISDMICROTAD-16ME 查看數據表（PDF） - Information Storage Devices

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ISDMICROTAD-16ME

Single-Chip Voice Record/Playback Device 16-Minute Duration

Information Storage Devices 

ISD MicroTAD-16M

SERIAL PERIPHERAL INTERFACE (SPI) DESCRIPTION

The ISD MicroTAD-16M operates from an SPI serial

interface. The SPI interface operates with the fol-

lowing protocol.

The data transfer protocol assumes that the mi-

crocontroller’s SPI shift registers are clocked on

the falling edge of the SCLK. With the ISD Micro-

TAD-16M, data is clocked in on the MOSI pin on

the rising clock edge. Data is clocked out on the

MISO pin on the falling clock edge.

MESSAGE CUEING

Message cueing allows the user to skip through

messages, without knowing the actual physical

location of the message. This operation is used

during playback. In this mode, the messages are

skipped 1600 times faster than in normal play-

back mode. It will stop when an EOM marker is

reached. Then, the internal address counter will

point to the next message.

1. All serial data transfers begin with the fall-

ing edge of SS pin.

2. SS is held LOW during all serial communica-

tions and held HIGH between instructions.

3. Data is clocked in on the rising clock edge

and data is clocked out on the falling

clock edge.

4. Play and Record operations are initiated

by enabling the device by asserting the SS

pin LOW, shifting in an opcode and an

address field to the ISD MicroTAD-16M de-

vice (refer to the Opcode Summary on

the page 6).

If you are utilizing the Message Cueing Com-

mand, you must perform the following Message

Cueing procedure to ensure proper Message

Cueing for the MicroTAD product. Failure to fol-

low this procedure may result in inaccurate Mes-

sage Cueing.

Procedure for Proper Message Cueing:

A single “dummy” STOP command must be sent

to the device before executing a Message Cue-

ing (MC) or SET Message Cueing (SET MC) In-

struction.

The “dummy” STOP instruction consists of a com-

mand with control bits set as follows:

5. The opcodes and address fields are as fol-

lows: <8 control bits> and <16 address

bits>.

6. Each operation that ends in an EOM or

Overflow will generate an interrupt, in-

cluding the Message Cueing cycles. The

Interrupt will be cleared the next time an

SPI cycle is initiated.

7. As Interrupt data is shifted out of the ISD

MicroTAD-16M MISO pin, control and ad-

dress data is simultaneously being shifted

into the MOSI pin. Care should be taken

such that the data shifted in is compatible

with current system operation. It is possible

to read interrupt data and start a new op-

eration within the same SPI cycle.

RUN bit = 0

PLAY/RECORD bit = 0

PU bit = 1

IAB bit = 1

MC bit = 0

That is, a hex “30” is shifted into the device as a

command.

One or more MC or SET MC commands may be

executed following this command. It is not nec-

essary to repeat the “dummy” STOP command

until after a subsequent playback operation.

8. An operation begins with the RUN bit set

and ends with the RUN bit reset.

9. All operations begin with the rising edge

of SS.

ISD

5

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