LTC2410IGN datasheet(44/48 Pages) LINER

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LTC2410

TYPICAL APPLICATIO S

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

* This example program transfers the LTC2410's 32-bit output

* conversion result into four consecutive 8-bit memory locations. *

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

*68HC11 register definition

PORTD

EQU

$1008

Port D data register

" – , – , SS* ,CSK ;MOSI,MISO,TxD ,RxD"

DDRD

EQU

$1009

Port D data direction register

SPSR

EQU

$1028

SPI control register

"SPIE,SPE ,DWOM,MSTR;SPOL,CPHA,SPR1,SPR0"

SPSR

EQU

$1029

SPI status register

"SPIF,WCOL, – ,MODF; – , – , – , – "

SPDR

EQU

$102A

SPI data register; Read-Buffer; Write-Shifter

* RAM variables to hold the LTC2410's 32 conversion result

DIN1

EQU

$00

This memory location holds the LTC2410's bits 31 - 24

DIN2

EQU

$01

This memory location holds the LTC2410's bits 23 - 16

DIN3

EQU

$02

This memory location holds the LTC2410's bits 15 - 08

DIN4

EQU

$03

This memory location holds the LTC2410's bits 07 - 00

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

* Start GETDATA Routine *

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

ORG

$C000

Program start location

INIT1

LDS

#$CFFF

Top of C page RAM, beginning location of stack

LDAA

#$2F

–,–,1,0;1,1,1,1

–, –, SS*-Hi, SCK-Lo, MOSI-Hi, MISO-Hi, X, X

STAA

PORTD

Keeps SS* a logic high when DDRD, bit 5 is set

LDAA

#$38

–,–,1,1;1,0,0,0

STAA

DDRD

SS*, SCK, MOSI are configured as Outputs

MISO, TxD, RxD are configured as Inputs

*DDRD's bit 5 is a 1 so that port D's SS* pin is a general output

LDAA

#$50

STAA

SPCR

The SPI is configured as Master, CPHA = 0, CPOL = 0

and the clock rate is E/2

(This assumes an E-Clock frequency of 4MHz. For higher E-

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

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

GETDATA PSHX

PSHY

PSHA

LDX

#$0

The X register is used as a pointer to the memory locations

that hold the conversion data

LDY

#$1000

BCLR

PORTD, Y %00100000

This sets the SS* output bit to a logic

low, selecting the LTC2410

LTC2410IGN Datasheet(PDF) 44 Page - Linear Technology

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