LTC1197LC datasheet(22/28 Pages) LINER

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LTC1197/LTC1197L

LTC1199/LTC1199L

APPLICATI

TYPICAL

Data Exchange Between LTC1199 and MC68HC05C4

Hardware and Software Interface to Motorola MC68HC05C4

LABEL

MNEMONIC

COMMENTS

START

BCLRn

Bit 0 Port C goes low (CS goes low)

LDA

Load LTC1199 DIN word into ACC

STA

Load LTC1199 DIN word into SPI from ACC

Transfer begins

TST

Test status of SPIF

BPL

Loop to previous instruction if not done

with transfer

LDA

Load contents of SPI data register

into ACC (DOUT MSBs)

STA

Start next SPI cycle

AND

Clear 6 MSBs of the first DOUT word

STA

Store in memory location A (MSBs)

TST

Test status of SPIF

BPL

Loop to previous instruction if not done

with transfer

BSETn

Set B0 of Port C (CS goes high)

LDA

Load contents of SPI data register into

ACC. (DOUT LSBs)

STA

Store in memory location A + 1 (LSBs)

MPU TRANSMIT

WORD

CLK

DOUT

MPU RECEIVED

WORD

DIN

ODD/

SIGN

SGL/

DIFF

XXXXXXXX

START

BIT

BYTE 1

BYTE 2 (DUMMY)

X = DON‘T CARE

START

DUMMY

SGL/

DIFF

DON‘T CARE

ODD/

SIGN

DUMMY

2ND TRANSFER

1ST TRANSFER

1197/99 TA03

DOUT from LTC1199 Stored in MC68HC05C4

LOCATION A + 1

LSB

MSB

LOCATION A

BYTE 2

BYTE 1

1197/99 TA05

1197/99 TA04

CLK

DIN

ANALOG

INPUTS

SCK

DOUT

MISO

MOSI

MC68HC05C4

LTC1199

LTC1197LC Datasheet(PDF) 22 Page - Linear Technology

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