Baseband Signal Processor

8

MX829 PRELIMINARY INFORMATION

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5.2 Write Only Register Description

5.2.1 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:

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)

CONTROL 1

00000000

CONTROL 2

00000000

CONTROL 3/IRQ ENABLE

00000000

AUDIO ATTENUATION

00000000

TXDATA

XXXXXXXX

MOD LEVELS (1)

00000000

MOD LEVELS (2)

00000000

RX SYNC WORD (1)

XXXXXXXX

RX SYNC WORD (2)

XXXXXXXX

STATUS

00000000

RXDATA

XXXXXXXX

X = undefined

5.2.2 CONTROL1 Register (Hex address $10)

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

AMP1

(Bit 7)

When this bit is "1", AMP1 is enabled.

When this bit is "0", AMP1 is disabled (i.e. powersaved).

AMP2

(Bit 6)

When this bit is "1", both AMP2 and MOD2 are enabled.

When this bit is "0", both AMP2 and MOD2 are disabled (i.e. powersaved) and the MOD2 output is

AUDIO

(Bit 5)

When this bit is "1", the audio filter/limiter section is enabled.

When this bit is "0", the audio filter/limiter section is disabled (i.e. powersaved).

MSKRX

(Bit 4)

When this bit is "1", the MSK Rx is enabled.

When this bit is "0", the MSK Rx is disabled (i.e. powersaved).

Note: The MSK Rx and Tx cannot both be enabled at the same time. If both MSKRX and MSKTX are "1", then they will

both be disabled (i.e. powersaved).

MSKTX

(Bit 3)

When this bit is "1", the MSK Tx is enabled.

When this bit is "0", the MSK Tx is disabled (i.e. powersaved).

Note: The MSK Tx and Rx cannot both be enabled at the same time. If both MSKTX and MSKRX are "1", then they will

both be disabled (i.e. powersaved).

The DTMF Encoder and MSK Tx cannot both be enabled at the same time. If both DTMFEN and MSKTX are "1",

then they will both be disabled.

UK/F

(Bit 2)

When this bit is "1", the SYNC/SYNT is set to the PAA standard of "1011010000110011" (SYNC)

When this bit is "0", the SYNC/SYNT is set to the MPT standard of "1100010011010111" (SYNC)

MIC

(Bit 1)

When this bit is "1", the MIC input is enabled and the AMP1 (DEMODIN) input is disabled.

When this bit is "0", the AMP1 (DEMODIN) input is enabled and the MIC input is disabled.

B/W

(Bit 0)

When this bit is "1", the bandwidth of the audio path is set wide for 20kHz/25kHz RF channel spacing.

When this bit is "0", the bandwidth of the audio path is set narrow for 12.5kHz RF channel spacing.