LTC1098ACN8-TR datasheet(26/32 Pages) LINER

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LTC1096/LTC1096L

LTC1098/LTC1098L

10968fc

TYPICAL APPLICATIONS

MPU TRANSMIT

WORD

CLK

DOUT

MPU RECEIVED

WORD

DIN

ODD/

SIGN

MSBF

SGL/

DIFF

XXXXXXXX

START

BIT

BYTE 1

BYTE 2 (DUMMY)

X = DON'T CARE

START

SGL/

DIFF

DON'T CARE

ODD/

SIGN

MSBF

2ND TRANSFER

1ST TRANSFER

10968 TA03

10968 TA04

CLK

DIN

ANALOG

INPUTS

SCK

DOUT

MISO

MOSI

MC68HC05C4

LTC1098

LOCATION A + 1

LSB

LOCATION A

BYTE 2

BYTE 1

10968 TA05

Data Exchange Between LTC1098(L) and MC68HC05C4

Hardware and Software Interface to Motorola MC68HC05C4

DOUT from LTC1098(L) Stored in MC68HC05C4

LABEL

MNEMONIC

COMMENTS

START

BCLRn

LDA

STA

TST

BPL

LDA

STA

AND

STA

TST

BPL

BSETn

LDA

STA

Bit 0 Port C goes low (CS goes low)

Load LTC1098(L) DIN word into Acc.

Load LTC1098(L) DIN word into SPI from Acc.

Transfer begins.

Test status of SPIF

Loop to previous instruction if not done

with transfer

Load contents of SPI data register

into Acc. (DOUT MSBs)

Start next SPI cycle

Clear the ﬁrst DOUT word

Store in memory location A (MSBs)

Test status of SPIF

Loop to previous instruction if not done

with transfer

Set B0 of Port C (CS goes high)

Load contents of SPI data register into

Acc. (DOUT LSBs)

Store in memory location A + 1 (LSBs)

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