LTC1293 datasheet(16/28 Pages) LINER

16 / 28 page

LTC1293/LTC1294/LTC1296

APPLICATI

I FOR ATIO

STAA

$102A

LOAD DIN INTO SPI, START SCK

WAIT2 LDAA

$1029

CHECK SPI STATUS REG

BPL

WAIT2

CHECK IF TRANSFER IS DONE

LDAA

$102A

LOAD LTC1294 MSBs INTO ACC A

STAA

$62

STORE MSBs IN $62

LDAA

$52

LOAD DUMMY DIN INTO ACC A FROM

$52

STAA

$102A

LOAD DUMMY DIN INTO SPI, START

SCK

WAIT3 LDAA

$1029

CHECK SPI STATUS REG

BPL

WAIT3

CHECK IF TRANSFER IS DONE

BSET

$08,X,$01 D0 GOES HIGH (CS GOES HIGH)

LDAA

$102A

LOAD LTC1294 LSBs IN ACC

STAA

$63

STORE LSBs IN $63

JMP

LOOP

START NEXT CONVERSION

LABEL MNEMONIC OPERAND COMMENTS

LDAA

#$50

CONFIGURATION DATA FOR SPCR

STAA

$1028

LOAD DATA INTO SPCR ($1028)

LDAA

#$1B

CONFIG. DATA FOR PORT D DDR

STAA

$1009

LOAD DATA INTO PORT D DDR

LDAA

#$10

LOAD DIN WORD INTO ACC A

STAA

$50

LOAD DIN DATA INTO $50

LDAA

#$E0

LOAD DIN WORD INTO ACC A

STAA

$51

LOAD DIN DATA INTO $51

LDAA

#$00

LOAD DUMMY DIN WORD INTO ACC A

STAA

$52

LOAD DUMMY DIN DATA INTO $52

LDX

#$1000

LOAD INDEX REGISTER X WITH $1000

LOOP BCLR

$08,X,$01 D0 GOES LOW (CS GOES LOW)

LDAA

$50

LOAD DIN INTO ACC A FROM $50

STAA

$102A

LOAD DIN INTO SPI, START SCK

LDAA

$1029

CHECK SPI STATUS REG

WAIT1 BPL

WAIT1

CHECK IF TRANSFER IS DONE

LDAA

$51

LOAD DIN INTO ACC A FROM $51

MC68HC11 CODE

LABEL MNEMONIC OPERAND

COMMENTS

Hardware and Software Interface to Intel 8051

CLK

DATA

(DIN/DOUT)

LTC1293 TD02

PS BIT LATCHED

INTO LTC1294

8051 P1.2 OUTPUT DATA

TO LTC1294

8051 P1.2 RECONFIGURED

AS INPUT AFTER THE 8TH RISING

CLK BEFORE THE 8TH FALLING CLK

LTC1294 SEND A/D RESULT

BACK TO 8051 P1.2

LTC1294 TAKES CONTROL OF DATA

LINE ON 8TH FALLING CLK

START

B11

SGL/

DIFF

ODD/

SIGN

SEL

UNI

MSB

B10

Hardware and Software Interface to Intel 8051

LTC1293 TD02a

DOUT FROM LTC1294 STORED IN 8051 RAM

B10

B11

LSB

MSB

CLK

DOUT

ANALOG

INPUTS

P1.4

P1.3

8051

DIN

P1.2

MUX ADDRESS

A/D RESULT

LTC1294

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