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參數資料
| 型號： | ISDMICROTAD-16M |
| 文件頁數： | 7/26頁 |
| 文件大小： | 1522K |
| 代理商： | ISDMICROTAD-16M |
ISD MicroTAD-16M
5
ISD
SERIAL PERIPHERAL INTERFACE (SPI) DESCRIPTION
The ISD MicroTAD-16M operates from an SPI serial
interface. The SPI interface operates with the follow-
ing protocol.
The data transfer protocol assumes that the mi-
crocontrollers SPI shift registers are clocked on the
falling edge of the SCLK. With the ISD MicroTAD-
16M, data is clocked in on the MOSI pin on the ris-
ing clock edge. Data is clocked out on the MISO
pin on the falling clock edge.
1.
All serial data transfers begin with the falling
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 device (refer
to the Opcode Summary on the page 6).
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, includ-
ing the Message Cueing cycles. The Inter-
rupt will be cleared the next time an SPI
cycle is initiated.
7.
As Interrupt data is shifted out of the ISD Mi-
croTAD-16M MISO pin, control and address
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 opera-
tion within the same SPI cycle.
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.
MESSAGE CUEING
Message cueing allows the user to skip through
messages, without knowing the actual physical lo-
cation of the message. This operation is used dur-
ing 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.
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 follow
this procedure may result in inaccurate Message
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) Instruc-
tion.
The “dummy” STOP instruction consists of a com-
mand with control bits set as follows:
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 neces-
sary to repeat the “dummy” STOP command until
after a subsequent playback operation.
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