ad28msp01 datasheet(5/28 Pages) AD

Part #	AD28MSP01

Description	PSTN Signal Port

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Manufacturer	AD [Analog Devices]

Direct Link	http://www.analog.com

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AD28msp01

REV. A

–5–

{This ADSP-2101 program initializes the AD28msp01}

{and executes a loopback, or talk-through, routine.}

. MODULE/RAM/BOOT = 0 MSP01;

. VAR/DM/CIRC rec[2];

{Receive word buffer}

. VAR/DM/CIRC trans[2];

{Transmit word buffer}

{lnterrupt Vectors}

rset:

JUMP start;

RTI; RTI; RTI;

irq2v:

RTI; RTI; RTI; RTI;

sprt0t:

AX0 = 0x25; DM(0x3ff3) = AX0;

{Disable TX autobuffer}

RTI; RTI;

sprt0r:

JUMP receive;

RTI; RTI; RTI;

sprt1t:

RTI; RTI; RTI; RTI;

sprt1r:

RTI; RTI; RTI; RTI;

timerv:

RTI; RTI; RTI; RTI;

{Initialize DAGs}

start:

I2 = ^ rec;

L2 = %rec;

I3 = ^ trans;

L3 = %trans;

M0 = 0;

M1 = 1;

S1 = 0;

DM(0x3000) = SI;

{Reset the AD28msp01}

{Initialize the ADSP-2101}

init dsp:

AX0 = 0x2a0f;

{Ext RFS, Int TfS, Ext SCLK, SLEN = 15}

DM(0x3ff6) = AX0;

{SPORT0 control register}

AX0 = 0x101f;

{Enable SPORT0}

DM(0x3fff) = AX0;

{System control register}

{Initialize AD28msp01 control register}

init msp01:

{Note: This section could be autobuffered.}

IMASK = 0x10;

{Enable SPORT0 TX interrupt}

AR = 0;

CNTR = 6;

DO initi UNTIL CE;

TX0 = AR;

{Transmit address}

IDLE;

TX0 = SI;

{Transmit control word}

IDLE;

AY0 = AR;

initi:

AR = AY0 +1;

{Increment address}

AX1 = 1;

AR = 0x18;

{Power up AD28msp01}

TX0 = AX1;

IDLE;

TX0 = AR;

AR = B#0025;

{Enable RX autobuffering with I2, M1}

DM(0x3ff3) = AR;

{Autobuffer control register}

IMASK = 0x18;

{Enable RX and TX interrupt}

wait:

JUMP wait;

{Wait for receive interrupt}

{Receive Interrupt Routine}

receive:

DM(0x3ff3) = SI;

{Disable autobuffering}

AX1= DM(I2, M1);

{Read first receive word from buffer}

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