FX828D2 datasheet(16/34 Pages) CMLMICRO

16 / 34 page

CTCSS/DCS/SELCALL Processor

FX828

D/828/4

(Hz)

4 x f

(Hz)

XTAL

TONE

where A is the binary number programmed into the 13 bits.

When Bit 7 (in the first 8 bits) is set to "1" the tone output is set at VBIAS or NOTONE without regard to the

number "A" programmed. When Bit 7 is "0" the programmed tone is set on the output. Programming the

bits 0 to 12 to "0" puts the Tx into powersave and the output goes to VBIAS. Powersave is also achieved

by disabling the SELCALL Tx.

8-bit Read Only Registers

HEX

ADDRESS/

COMMAND

NAME

BIT 7

(D7)

BIT 6

(D6)

BIT 5

(D5)

BIT 4

(D4)

BIT 3

(D3)

BIT 2

(D2)

BIT 1

(D1)

BIT 0

(D0)

SELCALL &

DCS

CTCSS

RX TONE

$81

SUB-AUDIO

DECODE/

FAST

TONE

MSB

LSB

STATUS

NO DECODE

TONE

DECODE

BIT 3

BIT 2

BIT 1

BIT 0

GP TIMER

COMP

TONE

CTCSS FAST

DCS

$8F

IRQ FLAG

IRQ

0 to 1

1 to 0

IRQ

FLAG

IRQ FLAG

FLAG

Read Only Register Description

SELCALL and SUB-AUDIO STATUS Register (Hex address $81)

This register is used to indicate the status of the device as described below:

DCS DECODE/NO

DECODE

(Bit 7)

When the DCS decoder is enabled this bit is continuously updated with the

result.

A "1" indicates a successful decode (with 3 or less errors).

A "0"

indicates a failure to decode.

CTCSS FAST TONE

(Bit 6)

When Bit 5 in the SIGNALLING CONTROL Register and Bit 3 in the

SIGNALLING SET-UP Register are set to enable FAST CTCSS DETECT mode,

this bit will be set to "1" if a periodic tone is detected. If no periodic tone is

detected this bit will be "0".

When bits 5 and 3 are set to enable FAST CTCSS PREDICTIVE mode, this bit

will be set to "1" if a periodic tone that matches the frequency programmed in

the CTCSS TX/FAST RX FREQUENCY Register is detected. If no match is

found this bit will be "0".

When Bit 5 in the SIGNALLING CONTROL Register is set to "0" this bit will be

"0".

(Bit 5)

Reserved for future use. This will be set to "0" but should be ignored by the

user's software.

TONE DECODE

(Bit 4)

This bit indicates the status of the tone decoder. A "1" indicates a tone has

been detected (TONE DECODE) and a "0" indicates the loss of the tone

(NOTONE).

FX828D2 Datasheet(PDF) 16 Page - CML Microcircuits

FX828D2 Datasheet(HTML) 16 Page - CML Microcircuits

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