LTC1417IGN datasheet(29/32 Pages) LINER

29 / 32 page

LTC1417

TYPICAL APPLICATIONS

E-Clock frequencies, change the above value of $50 to a

value that ensures the SCK frequency is 2MHz or less.)

GETDATAPSHX

PSHY

PSHA

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

* Setup indecies

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

LDX

#$0

The X register is used as a pointer to the memory

locations that hold the conversion data

LDY

#$1000

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

* Initialize the LTC1417’s CONVST input *

* to a logic high before a conversion

* start

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

BSET

PORTC,Y %01000000

This sets PORTC, Bit6 output to a logic

high, forcing CONVST to a logic high

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

* Retrieve the MUX address from memory

* and send it to the DG408

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

LDAA

PORTC

Capture the contents of PortC

ORAA

MUX

“Add” the MUX address

STAA

PORTC

Select the MUX channel

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

* Initiate a LTC1417 conversion

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

BCLR

PORTC,Y %01000000

This sets PORTC, Bit6 output to a logic

low, initiating a conversion

BSET

PORTC,Y %01000000

This resets PORTC, Bit6 output to a logic

high, returning CONVST to a logic high

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

* The next short loop ensures that the

* LTC1417’s conversion is finished

* before starting the SPI data transfer *

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

CONVENDLDAA

PORTC

Retrieve the contents of port D

ANDA

#%10000000

Look at Bit7

Bit7 = Hi; the LTC1417’s conversion is complete

Bit7 = Lo; the LTC1417’s conversion is not

complete

BPL

CONVEND

Branch to the loop’s beginning while Bit7

remains high

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

* This routine sends data to the LTC1417 and sets its MUX channel. The

* very first time this routine is entered produces invalid data. Each

* time thereafter, the data will correspond to the previous active

* CONVST signal sent to the LTC1417.

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

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