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M-986-2A1P Datasheet(PDF) 3 Page - Clare, Inc.

No. de pieza M-986-2A1P
Descripción Electrónicos  MF Transceiver
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Fabricante Electrónico  CLARE [Clare, Inc.]
Página de inicio  http://www.clare.com
Logo CLARE - Clare, Inc.

M-986-2A1P Datasheet(HTML) 3 Page - Clare, Inc.

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M-986-2A1
www.clare.com
Rev. 3
3
Initial Configuration: The configuration of the M-986-
2A1 immediately after a reset will be as follows:
channel disabled
2-of-6 input/output
external serial and serial frame clocks.
Also, the M-986-2A1 will place a 00 hex on the
coprocessor port to indicate to the host processor that
it is working.
Transmit Tone Command
The transmit tone command allows the host processor
to transmit any two of the 6 R1 MF frequencies. The
format of the command depends on whether the M-
986 is configured for binary format or 2-of-6 format.
Recieved Tone Detection
When a tone is detected by the M-986, the TBLF out-
put goes low, indicating reception of the tone to the
host processor. The host processor can determine
which tone was detected and which channel the tone
was detected on by reading data from the M-986
coprocessor port. The M-986 will return a single byte
indicating the tone received and the channel that the
tone was received on. The format of the returned byte
depends on whether the M-986 is configured for bina-
ry or 2-of-6 coding.
Coprocessor Port
Commands are written to the M-986 via the coproces-
sor port, and data indicating the received R1 MF tone
is read from the coprocessor port.
Writing to the Coprocessor Port: The following
sequence describes writing a command to the M-986.
(1) The WR signal is driven low by the host processor.
(2) The RBLE (receive buffer latch empty) signal tran-
sitions to a logic high level.
(3) Data is written from D7-D0 to the receive buffer
latch (D7-D0) when the WR signal goes high.
(4) The RBLE signal transitions to a logic low level
after the M-986 reads the data. This signals the host
processor that the receive buffer is empty.
Note: The RBLE should be low before writing to the
coprocessor.
Reading the Coprocessor Port: The following
sequence describes reading received tone informa-
tion from the coprocessor port.
(1) The TBLF (transmit buffer latch full) port pin on the
M-986 goes low indicating the reception of a tone.
(2) The host processor detects the low logic level on
the TBLF pin either by polling a connected port pin or
by an interrupt.
(3) The host processor drives the RD signal low.
(4) The TBLF (transmit buffer latch full) signal transi-
tion to a logic high level.
Configuration
Configuration Byte 1
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
0
0
ECLK
IOM
ENCI
KPL1
KPEN1
0
ECLK
Channels 1 & 2
1 = External codec clock; 0 = Internal codec clock
IOM
Channels 1 & 2
1 = Binary input/output; 0 = 2-of-6 input/output
ENC1
Channel 1
1 = Enable channel; 0 = Disable channel
KPL1
Channel 1
1 = 55 ms detection time for KP; 0 = 30 ms detection time for KP
KPEN1
Channel 1
1 = Enable MF tone detection after KP detection;
0 = MF tone detection always on
Configuration Byte 2
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
0
1
0
AMU
ENC2
KPL2
KPEN2
0
AMU
Channels 1 & 2
1 = A-law Encoding, 0 = m-law Encoding
ENC2
Channel 2
1 = Enable channel; 0 = Disable channel
KPL2
Channel 2
1 = 55 ms detection time for KP; 0 = 30 ms detection time for KP
KPEN2
Channel 2
1 = Enable MF tone detection after KP detection;
0 = MF tone detection always


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