LTC1598L(RevA) Ver la hoja de datos (PDF) - Linear Technology

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LTC1598L
(Rev.:RevA)

4- and 8-Channel, 3V Micropower Sampling 12-Bit Serial I/O A/D Converters

Linear Technology 

LTC1594L/LTC1598L

TYPICAL APPLICATIONS N

LDA #$52

STA $0A

LDA #$FF

STA $04

STA $05

STA $06

LDA #$08

STA $50

START BSET 0,$02

LDA $50

STA $0C

LOOP1 TST $0B

MC68HC05 CODE

Configuration data for serial peripheral

control register (Interrupts disabled, output

enabled, master, Norm = 0, Ph = 0, Clk/16)

Load configuration data into location $0A (SPCR)

Configuration data for I/O ports

(all bits are set as outputs)

Load configuration data into Port A DDR ($04)

Load configuration data into Port B DDR ($05)

Load configuration data into Port C DDR ($06)

Put DIN word for LTC1598L into Accumulator

(CH0 with respect to GND)

Load DIN word into memory location $50

Bit 0 Port C ($02) goes high (CS goes high)

Load DIN word at $50 into Accumulator

Load DIN word into SPI data register ($0C) and

start clocking data

Test status of SPIF bit in SPI status register ($0B)

BPL LOOP1 Loop if not done with transfer to previous instruction

BCLR 0,$02 Bit 0 Port C ($02) goes low (CS goes low)

LDA $0C Load contents of SPI data register into Accumulator

STA $0C Start next SPI cycle

LOOP2 TST $0B Test status of SPIF

BPL LOOP2 Loop if not done

LDA $0C Load contents of SPI data register into Accumulator

STA $0C Start next SPI cycle

AND #$IF Clear 3 MSBs of first DOUT word

STA $00 Load Port A ($00) with MSBs

LOOP3 TST $0B Test status of SPIF

BPL LOOP3 Loop if not done

LDA $0C Load contents of SPI data register into Accumulator

AND #$FE Clear LSB of second DOUT word

STA $01 Load Port B ($01) with LSBs

JMP START Go back to start and repeat program

CSMUX

= CSADC

= CS

CLK

Data Exchange Between LTC1598L and MC68HC05

DIN

EN D2 D1 DO

DOUT

MPU

TRANSMIT

WORD

MPU

RECEIVED

WORD

0 0 0 0 EN D2 D1 D0

BYTE 1

?? ????? ?

BYTE 1

DON‘T CARE

B11 B10 B9 B8 B7

B6

B5 B4 B3 B2 B1 B0 B1 B2

X X XX XX X X

BYTE 2

? ? 0 B11 B10 B9 B8 B7

BYTE 2

XXXXXX XX

BYTE 3

B6 B5 B4 B3 B2 B1 B0 B1

BYTE 3

1594L/98L TA03

Hardware and Software Interface to Motorola MC68HC05

DOUT FROM LTC1598L STORED IN MC68HC05 RAM

MSB

#00

00

0 B11 B10 B9 B8 B7 BYTE 1

ANALOG

LSB

INPUTS

#01 B6 B5 B4 B3 B2 B1 B0 0 BYTE 2

CSMUX

CSADC

LTC1598L CLK

DIN

DOUT

C0

MC68HC05

SCK

MOSI

MISO

1594L/98L TA04

20

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