CMX808A(2003) Просмотр технического описания (PDF) - CML Microcircuits

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производитель

CMX808A
(Rev.:2003)

Family Radio CTCSS ‘Type 2’ Encoder and Decoder

CML Microcircuits 

Family Radio CTCSS 'Type 2' Encoder and Decoder

CMX808A

Write Only Register Description

GENERAL RESET (Hex address $01)

The reset command has no data attached to it. It sets the device registers to zero (all powersaved) with

the exception of Bits 2, 1 and 0 of the SUB-AUDIO STATUS register $81.

SUB-AUDIO CONTROL Register (Hex address $80)

This register is used to control the functions of the device as described below:

CTCSS TX ENABLE

and DECODER

ENABLE

(Bits 7 and 6)

These two bits enable and disable the CTCSS decoder (Rx) or transmitter (Tx)

according to the table below:

Tx

Bit 7

0

0

1

1

Rx

Bit 6

0

1

0

1

Function

Tx disabled, Rx disabled

Tx disabled, Rx enabled

Tx enabled, Rx disabled

Tx enabled, Rx enabled

CTCSS DECODER

BANDWIDTH

(Bits 5, 4, 3 and 2)

These four bits set the bandwidth of the CTCSS tone decoder according to the

table below:

Bit 5 Bit 4 Bit 3 Bit 2

1

0

0

0

1

0

0

1

1

0

1

0

1

0

1

1

1

1

0

0

1

1

0

1

1

1

1

0

1

1

1

1

BANDWIDTH

Will

Will Not

Decode Decode

±1.1%

±2.4%

±1.3%

±2.7%

±1.6%

±2.9%

±1.8%

±3.2%

±2.0%

±3.5%

±2.2%

±3.7%

±2.5%

±4.0%

±2.7%

±4.2%

(Bit 1)

Reserved for future use. This bit should be set to "0".

CTCSS IRQ MASK

(Bit 0)

When this bit is set to "1" it enables the interrupt.

When this bit is set to "0" the interrupt is masked.

AUDIO CONTROL Register (Hex address $82)

This register is used to control the functions of the device as described below:

Note: TX BPF ENABLE (Bit 7) and RX BPF ENABLE (Bit 6) should not be enabled at the same time.

TX BPF ENABLE

(Bit 7)

When this bit is "1" the audio band-pass filter is enabled and the output of the

filter is switched to TX AUDIO OUT. The output is then controlled by BPF UN-

MUTE. See Bit 5 below.

When this bit is “0” the audio band pass filter is disabled (powersaved) and the

output of the filter is disconnected from TX AUDIO OUT, which is then in a high

impedance state.

 2003 CML Microsystems Plc

8

D/808A/6

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