LTC1096AI(RevB) 데이터 시트보기 (PDF) - Linear Technology

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LTC1096AI
(Rev.:RevB)

Micropower Sampling 8-Bit Serial I/O A/D Converters

Linear Technology 

TYPICAL APPLICATI S

LTC1096/LTC1096L

LTC1098/LTC1098L

MPU TRANSMIT

WORD

CS

DIN

CLK

Data Exchange Between LTC1098(L) and MC68HC05C4

START

BIT

BYTE 1

0

0

0

1

SGL/

DIFF

ODD/

SIGN

MSBF

X

BYTE 2 (DUMMY)

XXXXXXXX

X = DON'T CARE

START

SGL/

DIFF

ODD/

SIGN

MSBF

DON'T CARE

DOUT

MPU RECEIVED

WORD

?? ?? ?? ?0

1ST TRANSFER

B7 B6 B5 B4 B3 B2 B1 B0

B7 B6 B5 B4 B3 B2 B1 B0

2ND TRANSFER

LTC1096/8 • TA03

Hardware and Software Interface to Motorola MC68HC05C4

ANALOG

INPUTS

CS

CLK

LTC1098

DIN

DOUT

C0

SCK

MC68HC05C4

MISO

MOSI

LTC1096/8 • TA04

DOUT from LTC1098(L) Stored in MC68HC05C4

LOCATION A 0 0 0 0 0 0 0 0 BYTE 1

LSB

LOCATION A + 1 B7 B6 B5 B4 B3 B2 B1 B0 BYTE 2

LTC1096/8 • TA05

LABEL

START

MNEMONIC

BCLRn

LDA

STA

TST

BPL

LDA

STA

AND

STA

TST

BPL

BSETn

LDA

STA

COMMENTS

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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