FX805J Ver la hoja de datos (PDF) - CML Microsystems Plc

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FX805J

Sub-audio signalling processor

CML Microsystems Plc 

Controlling Protocol ......

“Write to Control Register” – A/C 70 (78 ), followed by 1 byte of Command Data.

H

H

Table 3 (below) shows the configurations available to the FX805. Bits 5, 6 and 7 are used together to Enable and Powersave

circuit sections as required.

Setting

Control Bits

MSB

Transmitted First

765

Functions Enabled

Functions Powersaved

0

0

0

0

0

1

0

1

0

0

1

1

1

0

0

1

0

1

1

1

0

1

1

1

4

1

0

3

1

0

2

1

0

1

1

0

0

1

0

CTCSS Decoder

NRZ Decoder

CTCSS Encoder

NRZ Encoder

CTCSS Encoder and Decoder

NRZ Encoder and CTCSS Decoder

NRZ Decoder and CTCSS Decoder

NRZ Decoder

NRZ Decoder and Both Encoders

CTCSS Decoder and Both Encoders

All Decoders

All Decoders

NRZ Encoder and Decoder

None

All Encoders

All Encoders (except Tx Sub-Audio LPF)

and CTCSS Decoder

Enable Audio Output – Used with Bit 3

Disable Audio Output – Output to V

BIAS

Enable Sub-Audio Bandstop Filter (Audio Signal Path)

By-pass Sub-Audio Bandstop Filter

Enable All FX805 Interrupts

Disable All FX805 Interrupts

Set Rx Lowpass Filter bandwidth to 180Hz – For low CTCSS Tones or NRZ Data

Set Rx Lowpass Filter bandwidth to 260Hz

All Encoders and Decoders Powersaved (Powersave All)

All Encoders and Decoders Enabled unless individually Powersaved

Table 3 Control Register

General Reset

Upon Power-Up the “bits” in the FX805 registers will be

random (either “0” or “1”). A General Reset Command (01 )

H

will be required to “reset” all microcircuits on the

“C-BUS,” and has the following effect upon the FX805.

Control Register

Status Register

NOTONE Timer

Set as 00H

Set as 00

H

Discharged

Warning – The following FX805 register configurations are

not affected by a General Reset command:

CTCSS Rx Frequency

CTCSS Tx Frequency/NRZ Baud Rate Register

NRZ Rx Data Register

NRZ Tx Data Register

Gain-Set Register

Note that setting the Control Register in this way (General

Reset) will set the FX805 to the CTCSS Decode mode and

overwrite a “Powersave All” instruction.

It should also be considered that a General Reset

command will reset ALL DBS 800 microcircuits operating on

the “C-BUS.”

Glossary of Abbreviations

Below is a list of abbreviations used within this Data Sheet.

CDCS

CTCSS

DPL™

LTR™

NRZ

f

CO

f

CTCSS IN

f

CTCSS OUT

f

TONE

fXTAL

R

NRZ Rx

R

NRZ Tx

SINPUT

Continuous Digitally Coded Squelch

Continuous Tone Controlled Squelch

Digital Private Line

Logic Trunked Radio

Non-Return-to-Zero data levels

Filter cut-off frequency

Sub-Audio Rx frequency

Sub-Audio Tx frequency

Tone frequency

Xtal/clock frequency

NRZ Rx baud rate

NRZ Tx baud rate

Audio input signal

7

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