LTC1599 View Datasheet(PDF) - Linear Technology

Part Name

Description

Manufacturer

LTC1599

16-Bit Byte Wide, Low Glitch Multiplying DAC with 4-Quadrant Resistors

Linear Technology 

LTC1599

APPLICATIONS INFORMATION

GETDATA PSHX

PSHY

PSHA

LDY #$1000 Setup index

*

*****************************************

* Retrieve DAC data from memory and

*

* send it to the LTC1599

*

*****************************************

*

LDAA LBYTE

Retrieve the least significant byte from memory

BCLR PORTA,Y %00010000

This sets PORTA, Bit4 output to a logic

*

low, forcing MLBYTE input to a logic low

BCLR PORTA,Y %00001000

This forces a low on the LTC1599’s WR pin

STAA PORTB

Transfer the least significant byte to the DAC

BSET PORTA,Y %00001000

This forces a high on the LTC1599’s WR pin

BSET PORTA,Y %00010000

This sets PORTA, Bit4 output to a logic

*

high, forcing MLBYTE to a logic high

LDAA MBYTE

Retrieve the most significant byte from memory

BCLR PORTA,Y %00001000

This forces a low on the LTC1599’s WR pin

STAA PORTB

Transfer the most significant byte to the DAC

BSET PORTA,Y %00001000

This forces a high on the LTC1599’s WR pin

*

*******************************************

* The next two instructions exercise

*

* the LD input, latching the data

*

* that was just loaded

*

*******************************************

*

BCLR PORTD,Y %00100000

LD goes low

BSET PORTD,Y %00100000

and returns high

*

*******************************************

* Data transfer routine completed

*

*******************************************

*

PULA

Restore the A register

PULY

Restore the Y register

PULX

Restore the X register

RTS

18

sn1599 1599fs

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