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参数资料
| 型号： | ISD MicroTAD-16M |
| 厂商： | WINBOND ELECTRONICS CORP |
| 英文描述： | Single-Chip Voice Record/Playback Device（Single-chip Durations of 16 minutes)(单片的录音/录音重放器(单片信息存储持续时间16分钟）) |
| 中文描述： | 单芯片语音记录/播放设备（单芯片的持续时间16分钟）（单片的录音/录音重放器（单片信息存储持续时间16分钟）） |
| 文件页数： | 9/28页 |
| 文件大小： | 650K |
| 代理商： | ISD MICROTAD-16M |
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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 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.
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).
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.
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
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.
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:
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.
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