Baseband Signal Processor

FX829

© 1997 Consumer Microcircuits Limited

9

D/829/4

1.5.1

Software Description

Address/Commands

Instructions and data are transferred, via "C-BUS", in accordance with the timing information given in

Figure 11.

Instruction and data transactions to and from the FX829 consist of an Address/Command (A/C) byte

followed by either:

(i)

a further instruction or data (1 or 2 bytes) or

(ii)

a status or Rx data reply (1 byte)

8-bit Write Only Registers

HEX

ADDRESS/

COMMAND

REGISTER

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)

$01

RESET

N/A

N/A

N/A

N/A

N/A

N/A

N/A

N/A

$10

CONTROL 1

AMP1

AMP2

AUDIO

FFSKRX

FFSKTX

UK/F

MIC

B/W

$11

CONTROL 2

CHKSUM

DTMFEN

DTMFHI

DTMFLO

DTMF3

DTMF2

DTMF1

DTMF0

$13

AUDIO

<-------------------------- GAIN -------------------------->

ATTENUATION

0

0

0

BIT 4

BIT 3

BIT 2

BIT 1

BIT 0

$40

CONTROL 3/

IRQ ENABLE

0

1200/2400

TXIDLEM RXDATAM TXDATAM

RX SYNC

WORD

PRIME

SYNT

PRIME

SYNC

PRIME

$43

TXDATA

<----------------------------------------------- TXDATA ----------------------------------------------->

BIT 7

BIT 6

BIT 5

BIT 4

BIT 3

BIT 2

BIT 1

BIT 0

16-bit Write Only Registers

HEX

ADDRESS/

COMMAND

REGISTER

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)

$12

MOD LEVELS

MOD 1

<-------------------------- MOD 1 -------------------------->

(1)

0

0

ENABLE

BIT 4

BIT 3

BIT 2

BIT 1

BIT 0

<-------------------------- MOD 2 -------------------------->

(2)

0

0

0

BIT 4

BIT 3

BIT 2

BIT 1

BIT 0

$44

RX SYNC

<------------------------------------------- RX SYNC WORD ----------------------------------------->

WORD (1)

BIT 15

BIT 14

BIT 13

BIT 12

BIT 11

BIT 10

BIT 9

BIT 8

<------------------------------------------- RX SYNC WORD ----------------------------------------->

(2)

BIT 7

BIT 6

BIT 5

BIT 4

BIT 3

BIT 2

BIT 1

BIT 0

Write Only Register Description

RESET Register (Hex address $01)

The reset command has no data attached to it. It sets the device registers into the specific states as listed

below: